2024年10月21日发(作者：龙思烟)
Service Letter SL09-509/SBJ
Dear Sirs
Based on the latest service experience and experience with Condition
Based Overhaul (CBO), we are pleased to issue a revised version of
Guiding Overhaul Intervals tables. The guiding overhaul intervals apply
to both electronically controlled engines (ME types) and mechanically,
controlled engines (MC types).
Please note that the intervals in the lists apply only to engines with so-
called high topland pistons. High topland pistons are pistons where the
topland is significantly higher than the ringland.
For engines with high topland pistons, overhauls can normally be ex-
tended even further than described in the tables, typically to more than
32,000 hours. The means to obtain and document this are described in
SL07-483/HRR.
Please direct any inquiries and questions regarding tables or condition-
based overhaul to our Operation Department at leo@ or
to our Service Department at PrimeServ-cph@.
Yours faithfully
Mikael C Jensen Stig B Jakobsen
Vice President, EngineeringSenior Manager, Engineering
Head office (& postal address)PrimeServProduction
MAN Diesel
Teglholmsgade 41Teglholmsgade 35
Teglholmsgade 412450 Copenhagen SV2450 Copenhagen SV
2450 Copenhagen SVDenmarkDenmark
Denmark
Phone: +45 33 85 11 00Phone: +45 33 85 11 00
Phone: +45 33 85 11 00
Fax: +45 33 85 10 49Fax: +45 33 85 10 17
Fax: +45 33 85 10 30
PrimeServ-cph@ufacturing-dk@
mandiesel-cph@
Action code:
WHEN CONVENIENT
Guiding Overhaul Intervals
Updated Tables
SL09-509/SBJ
April 2009
Concerns
Owners and operators of MAN B&W
two-stroke diesel engines.
Type: ME/ME-C, ME-B and MC/MC-C
Overhaul of cylinder unit on large bore
engine
Forwarding & Receiving
MAN Diesel
Teglholmsgade 35 Branch of MAN Diesel SE, Germany
2450 Copenhagen SVCVR No.: 31611792
DenmarkHead office: Teglholmsgade 41
Phone: +45 33 85 11 00
2450 Copenhagen SV, Denmark
Fax: +45 33 85 10 16
German .: HRB 22056
Amtsgericht Augsburg
MAN Diesel – a member of the MAN Group
Service Letter SL09-509/SBJ
ME-B engines
Guiding overhaul intervals and expected service life
Component
Cylinder liner
Overhaul interval (hours)
Bore sizes
60-50
46-35
Bore sizes
60-50
46-35
Bore sizes
60-50
46-35
16,000
12,000
16,000
12,000
16,000
12,000
Expected service life (hours)Remarks
Bore sizes
60-46
40-35
Bore sizes
60-35
Bore sizes
60-46
40-35
60,000
50,000
16,000
Pressure test at every 2
nd
piston
overhaul, recondition/rechrome when
required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Check the overall cylinder condition
through the scavenge ports at least
once a month.
Piston rings
Piston crown
60,000
50,000
Stuffing boxBore sizes
60-50
46-35
16,000
12,000
Check lamellas
Bore sizes
60-50
46-35
32,000
24,000
Renew lamellas
Normally, HVOF coated stems need
no reconditioning.
50,000
Usually only light grinding of seats is
required at subsequent inspections.
1) Condition check
Inspection of air spring according
to instruction manual. Two or three
valves to be inspected.
2) Subsequent inspection
Condition check + possible complete
overhaul. Max burn off rate of spindle
disc underside to be estimated and
calculated for lifetime of spindle. All
valves to be inspected.
Check and replace hydrostatic bear-
ings at overhaul. Check and replace
cylinder set and piston if required.
20,000
Replace valve after 20,000 hours
Replace sealings at overhaul
Replace static sealing rings at over-
haul.
64,000Check and replace if required
Exhaust valve spindle
and bottom piece (cage)
Inspection of seat and air spring:
Bore sizes
60-35
First inspection 1)
Bore sizes
50-35
Subsequent inspections 2)
Bore size
60
Subsequent inspections 2)
Bore sizes
50-35
DuraSpindle exhaust valve
Bore size
60
DuraSpindle or
Nimonic exhaust valve
6,000
100,000
16,000
To be obtained for DuraSpindle and
Nimonic valve with reconditioning of
seat and possible re-welding of disk
underside
32,000
Main hydraulic pump 32,000Engine lifetime
Proportional valve for
main hydraulic pump
Pressure relief valve for
main hydraulic pumps
Exhaust valve actuator
ELFI valve
Fuel valve
Fuel oil pressure booster
40,000
32,000
32,000
8,000
- depending on fuel quality
Engine lifetime
Engine lifetime
Valve nozzle
Spindle guide
16,000 Check and replace if required
16,000
64,000
Replace or recondition
Change piston rings on hydraulic pis-
ton and suction valve at overhaul.
32,000
- based on engine observations
Guiding Overhaul Intervals. Page 2 of 7 pages
Service Letter SL09-509/SBJ
ME-B engines
Guiding overhaul intervals and expected service life
Component
Cylinder cover
Overhaul interval (hours)Expected service life (hours)Remarks
96,000Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve
Cylinder lubricator
Crosshead bearings
Main bearings
Crank bearings
Thrust bearings
Tie rods including
bracing screws
Holding down bolts
Turbocharger
Air cooler(s)
12,000
24,000
Engine lifetime
Engine lifetime
Engine lifetime
Engine lifetime
According to manufacturer’s
recommendations.
45,000
or according to manufacturer’s rec-
ommendations.
Engine lifetime
According to manufacturer’s
recommendations.
Clean before differential pressure has
increased 50% compared to sea trial
value.
64,000
96,000
96,000
96,000
Check timing and adjustment
Do not open bearings unless
bearing material fragments fall out or
other bearing inspection measures
indicate so.
Check clearances and crankshaft
deflection: once a year.
Check bearing edges by wire gauges:
once a year
Tighten rods and screws:
once a year
Tighten: once a year
According to manufacturer’s
recommendations.
Cleaning:
based on engine observations
Check movement at every
scavenge port inspection.
Cleaning:
based on engine observations
Cleaning: 32,000
Flaps and butterfly
valves in scavenge air
receiver
Various fuel and
lubricating oil filters
Lubricating oil bottom
tank
Chains
Typically done at 5 years docking
96,000New or overhauled chains to be
checked/retightened after 500, 1,500
hours.
Replace membranes after 5 years
32,000
64,000
64,000
64,000
96,000
Replace after 5 years
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Retighten chains: 3,000-4,000
- every six months
N2 pressure
Rubber membranes:
3,000
32,000
Accumulators on
HPS and HCU
Hydraulic hoses
Angle encoder
Marker sensor
MPC, MOP A, MOP B
Cables
Engine lifetime
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
6,000
6,000
6,000
6,000
Guiding Overhaul Intervals. Page 3 of 7 pages
Service Letter SL09-509/SBJ
ME/ME-C engines
Guiding overhaul intervals and expected service life
Component
Cylinder liner
Overhaul interval (hours)
Bore sizes
98-80
Bore sizes
70-50
24,000
16,000
24,000
16,000
24,000
Expected service life (hours)Remarks
Bore sizes
98-90
80-65
60-50
Bore sizes
98-80
Bore sizes
70-50
Bore sizes
98-90
80-65
60-50
80,000
70,000
60,000
Check the overall cylinder condition
through the scavenge ports at least
once a month.
Piston ringsBore sizes
98-80
Bore sizes
70-50
24,000
16,000
80,000
70,000
60,000
Pressure test at every 2
nd
piston
overhaul, recondition/rechrome when
required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Piston crownBore sizes
98-90
Bore sizes
70-50 16,000
Stuffing boxBore sizes
98-80
70-50
24,000
16,000
Check lamellas
32,000
32,000
Renew lamellas
Bore sizes
98-60
Nimonic exhaust valve
Normally, HVOF coated stems need
no reconditioning.
100,000
Exhaust valve spindle
and bottom piece (cage)
Inspection of seat and air spring:
Bore sizes
98-50
First inspection 1)
Bore sizes
98-50
Subsequent inspections 2)
6,000
32,000
Usually only light grinding of seats is
To be obtained for Nimonic valve with required at subsequent inspections.
reconditioning of seat and possible
re-welding of disk underside1) Condition check
Inspection of air spring according
to instruction manual. Two or three
valves to be inspected.
2) Subseq. Inspection
Condition check + possible complete
overhaul. Max burn off rate of spindle
disc underside to be estimated and
calculated for lifetime of spindle.
All valves to be inspected.
Main hydraulic pump 32,000Engine lifetime Check and replace hydrostatic bear-
ings at overhaul. Check and replace
cylinder set and piston if required.
20,000
Replace valve after 20,000 hours
Replace sealings at overhaul
Replace static sealing rings at over-
haul.
64,000Check and replace if required
Proportional valve for
main hydraulic pump
Pressure relief valve for
main hydraulic pumps
Exhaust valve actuator
FIVA valve
Fuel valve
Fuel oil pressure booster
40,000
32,000
32,000
8,000
- depending on fuel quality
Engine lifetime
Engine lifetime
Valve nozzle
Spindle guide
16,000 Check and replace if required
16,000
64,000
Replace or recondition
Change piston rings on hydraulic pis-
ton and suction valve at overhaul.
32,000
- based on engine observations
Guiding Overhaul Intervals. Page 4 of 7 pages
Service Letter SL09-509/SBJ
ME/ME-C engines
Guiding overhaul intervals and expected service life
Component
Cylinder cover
Overhaul interval (hours)Expected service life (hours)Remarks
96,000Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve
Cylinder lubricator
Crosshead bearings
Main bearings
Crank bearings
Thrust bearings
Tie rods including
bracing screws
Holding down bolts
Turbocharger
Air cooler(s)
12,000
24,000
Engine lifetime
Engine lifetime
Engine lifetime
Engine lifetime
According to manufacturer’s
recommendations.
45,000
or according to manufacturer’s rec-
ommendations
Engine lifetime
According to manufacturer’s
recommendations.
Clean before differential pressure has
increased 50% compared to sea trial
value.
64,000
96,000
96,000
96,000
Check timing and adjustment
Do not open bearings unless
bearing material fragments fall out or
other bearing inspection measures
indicate so.
Check clearances and crankshaft
deflection: once a year.
Check bearing edges by wire gauges:
once a year
Tighten rods and screws:
once a year
Tighten: once a year
According to manufacturer’s
recommendations.
Cleaning:
based on engine observations
Check movement at every
scavenge port inspection
Cleaning:
based on engine observations
Cleaning: 32,000
Flaps and butterfly
valves in scavenge air
receiver
Various fuel and
lubricating oil filters
Lubricating oil bottom
tank
Chains
Typically done at 5 years docking
96,000New or overhauled chains to be
checked/retightened after 500, 1,500
hours.
Retighten chains: 3,000-4,000
- every six months
First inspection:
Subsequent inspections:
N2 pressure:
Rubber membranes:
Gear wheel drive for
hydraulic pumps
Accumulators on
HPS and HCU
Hydraulic hoses
MPC, MOP A, MOP B
CCU and ACU amplifiers
LVDT and LDI hydraulic
pump amplifiers
Fuel booster sensor
Exhaust valve sensor
Angle encoder
Marker sensor
Cables
500
Gear wheel: Engine lifetime
6,000
Gear wheel bearings:
3,000
32,000
Engine lifetime
96,000
Replace membranes after 5 years
32,000
64,000
64,000
64,000
64,000
64,000
64,000
64,000
96,000
Replace after 5 years
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
6,000
6,000
6,000
6,000
6,000
6,000
6,000
6,000
Guiding Overhaul Intervals. Page 5 of 7 pages
Service Letter SL09-509/SBJ
MC/MC-C engines
Guiding overhaul intervals and expected service life
Component
Cylinder liner
Overhaul interval (hours)
Bore sizes
98-50
46-26
16,000
12,000
Expected service life (hours)Remarks
Bore sizes
98-90
80-70
60-50
46-35
26
Bore sizes
98-50
46-26
Bore sizes
98-90
80-70
60-50
46-35
26
Bore sizes
98-50
46-26
80,000
70,000
60,000
50,000
40,000
16,000
12,000
80,000
70,000
60,000
50,000
40,000
32,000
24,000
Renew lamellas
Normally, HVOF coated stems need
no reconditioning.
50,000
Usually only light grinding of seats is
required at subsequent inspections.
1) Condition check
Inspection of air spring according
to instruction manual. Two or three
valves to be inspected.
2) Subsequent inspection
Condition check + possible complete
overhaul. Max burn off rate of spindle
disc underside to be estimated and
calculated for lifetime of spindle. All
valves to be inspected.
Pressure test at every 2
nd
piston
overhaul, recondition/rechrome when
required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Check the overall cylinder condition
through the scavenge ports at least
once a month.
Piston ringsBore sizes
98-50
46-26
Bore sizes
98-50
46-26
16,000
12,000
16,000
12,000
Piston crown
Stuffing boxBore sizes
98-50
46-26
16,000
12,000
Check lamellas
Exhaust valve spindle
and bottom piece (cage)
Inspection of seat and air spring:
Bore sizes
98-35
First inspection 1)
Bore sizes
50-35
Subsequent inspections 2)
Bore sizes
98-60
Subsequent inspections 2)
Bore sizes
50-35
DuraSpindle exhaust valve
Bore size
60
DuraSpindle or
Nimonic exhaust valve
6,000
100,000
16,000
To be obtained for DuraSpindle and
Nimonic valve with reconditioning of
seat and possible re-welding of disk
underside.
32,000
Actuator gear
Fuel valve
Fuel pump plunger and
barrel, suction valve,
puncture valve and
shock absorber
Cylinder cover
Hydraulic system
32,000
Valve nozzle
Spindle guide
Renew or recondition:
64,000
16,000 Check and replace if required
16,000
40,000
Change sealing rings on barrel,
plunger, puncture valve and suction
valve.
8,000
- depending on fuel quality
16,000
- based on engine observations
8,000
For suction valve and puncture valve
96,000Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve, safety
valve and indicator cock
12,000
Engine lifetime
Guiding Overhaul Intervals. Page 6 of 7 pages
Service Letter SL09-509/SBJ
MC/MC-C engines
Guiding overhaul intervals and expected service life
Component
Alpha Lubricator
Crosshead bearings
Main bearings
Crank bearings
Thrust bearings
Roller guide for fuel
pump and exhaust valve
Chains
Overhaul interval (hours)
Check/ Refill accumulators
Overhaul lubricators
8,000
32,000
Expected service life (hours)Remarks
Engine lifetime
Engine lifetime
96,000
64,000
96,000
96,000
96,000
Do not open bearings unless
bearing material fragments fall out or
other bearing inspection measures
indicate so.
Check running surfaces and free ro-
tation of roller.
New or overhauled chains to be
checked/retightened after 500, 1,500
hours.
First inspections and retightenings
after 500, 1,000 and 1,500 hours in
total service.
Pneumatic/hydraulic governor:
Oil change every 4,000 hours.
Check clearances and crankshaft
deflection: once a year.
Check bearing edges by wire gauges:
once a year
Check condition in situ:
Tighten chains:
Visual inspection:
1,500
3,000-4,000
- every six months
3,000-4,000
Chain wheels and rub-
ber guide bars
Reversing and regulat-
ing gear
Tie rods including brac-
ing screws
Holding down bolts
Turbocharger
Air cooler(s)
Chain wheels:
Guide bars:
Engine lifetime
96,000
32,000
Check moving parts:
3,000-4,000
Engine lifetime
Engine lifetime
According to manufacturer’s
recommendations.
45,000
Tighten rods and screws:
once a year
Tighten: once a year
According to manufacturer’s
recommendations.
Cleaning:
based on engine observations
Check movement at every scavenge
port inspection.
Cleaning:
based on engine observations
According to manufacturer’s
recommendations.
Clean before differential pressure
has increased 50% compared to sea
trial value.
Flaps and butterfly
valves in scavenge air
receiver
Various fuel and lubri-
cating oil filters.
Camshaft filters and
TCS filters, if any
Lubricating oil bottom
tank
Engine lifetime.
Cleaning: 32,000
Typically done at 5 years docking
Guiding Overhaul Intervals. Page 7 of 7 pages
2024年10月21日发(作者：龙思烟)
Service Letter SL09-509/SBJ
Dear Sirs
Based on the latest service experience and experience with Condition
Based Overhaul (CBO), we are pleased to issue a revised version of
Guiding Overhaul Intervals tables. The guiding overhaul intervals apply
to both electronically controlled engines (ME types) and mechanically,
controlled engines (MC types).
Please note that the intervals in the lists apply only to engines with so-
called high topland pistons. High topland pistons are pistons where the
topland is significantly higher than the ringland.
For engines with high topland pistons, overhauls can normally be ex-
tended even further than described in the tables, typically to more than
32,000 hours. The means to obtain and document this are described in
SL07-483/HRR.
Please direct any inquiries and questions regarding tables or condition-
based overhaul to our Operation Department at leo@ or
to our Service Department at PrimeServ-cph@.
Yours faithfully
Mikael C Jensen Stig B Jakobsen
Vice President, EngineeringSenior Manager, Engineering
Head office (& postal address)PrimeServProduction
MAN Diesel
Teglholmsgade 41Teglholmsgade 35
Teglholmsgade 412450 Copenhagen SV2450 Copenhagen SV
2450 Copenhagen SVDenmarkDenmark
Denmark
Phone: +45 33 85 11 00Phone: +45 33 85 11 00
Phone: +45 33 85 11 00
Fax: +45 33 85 10 49Fax: +45 33 85 10 17
Fax: +45 33 85 10 30
PrimeServ-cph@ufacturing-dk@
mandiesel-cph@
Action code:
WHEN CONVENIENT
Guiding Overhaul Intervals
Updated Tables
SL09-509/SBJ
April 2009
Concerns
Owners and operators of MAN B&W
two-stroke diesel engines.
Type: ME/ME-C, ME-B and MC/MC-C
Overhaul of cylinder unit on large bore
engine
Forwarding & Receiving
MAN Diesel
Teglholmsgade 35 Branch of MAN Diesel SE, Germany
2450 Copenhagen SVCVR No.: 31611792
DenmarkHead office: Teglholmsgade 41
Phone: +45 33 85 11 00
2450 Copenhagen SV, Denmark
Fax: +45 33 85 10 16
German .: HRB 22056
Amtsgericht Augsburg
MAN Diesel – a member of the MAN Group
Service Letter SL09-509/SBJ
ME-B engines
Guiding overhaul intervals and expected service life
Component
Cylinder liner
Overhaul interval (hours)
Bore sizes
60-50
46-35
Bore sizes
60-50
46-35
Bore sizes
60-50
46-35
16,000
12,000
16,000
12,000
16,000
12,000
Expected service life (hours)Remarks
Bore sizes
60-46
40-35
Bore sizes
60-35
Bore sizes
60-46
40-35
60,000
50,000
16,000
Pressure test at every 2
nd
piston
overhaul, recondition/rechrome when
required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Check the overall cylinder condition
through the scavenge ports at least
once a month.
Piston rings
Piston crown
60,000
50,000
Stuffing boxBore sizes
60-50
46-35
16,000
12,000
Check lamellas
Bore sizes
60-50
46-35
32,000
24,000
Renew lamellas
Normally, HVOF coated stems need
no reconditioning.
50,000
Usually only light grinding of seats is
required at subsequent inspections.
1) Condition check
Inspection of air spring according
to instruction manual. Two or three
valves to be inspected.
2) Subsequent inspection
Condition check + possible complete
overhaul. Max burn off rate of spindle
disc underside to be estimated and
calculated for lifetime of spindle. All
valves to be inspected.
Check and replace hydrostatic bear-
ings at overhaul. Check and replace
cylinder set and piston if required.
20,000
Replace valve after 20,000 hours
Replace sealings at overhaul
Replace static sealing rings at over-
haul.
64,000Check and replace if required
Exhaust valve spindle
and bottom piece (cage)
Inspection of seat and air spring:
Bore sizes
60-35
First inspection 1)
Bore sizes
50-35
Subsequent inspections 2)
Bore size
60
Subsequent inspections 2)
Bore sizes
50-35
DuraSpindle exhaust valve
Bore size
60
DuraSpindle or
Nimonic exhaust valve
6,000
100,000
16,000
To be obtained for DuraSpindle and
Nimonic valve with reconditioning of
seat and possible re-welding of disk
underside
32,000
Main hydraulic pump 32,000Engine lifetime
Proportional valve for
main hydraulic pump
Pressure relief valve for
main hydraulic pumps
Exhaust valve actuator
ELFI valve
Fuel valve
Fuel oil pressure booster
40,000
32,000
32,000
8,000
- depending on fuel quality
Engine lifetime
Engine lifetime
Valve nozzle
Spindle guide
16,000 Check and replace if required
16,000
64,000
Replace or recondition
Change piston rings on hydraulic pis-
ton and suction valve at overhaul.
32,000
- based on engine observations
Guiding Overhaul Intervals. Page 2 of 7 pages
Service Letter SL09-509/SBJ
ME-B engines
Guiding overhaul intervals and expected service life
Component
Cylinder cover
Overhaul interval (hours)Expected service life (hours)Remarks
96,000Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve
Cylinder lubricator
Crosshead bearings
Main bearings
Crank bearings
Thrust bearings
Tie rods including
bracing screws
Holding down bolts
Turbocharger
Air cooler(s)
12,000
24,000
Engine lifetime
Engine lifetime
Engine lifetime
Engine lifetime
According to manufacturer’s
recommendations.
45,000
or according to manufacturer’s rec-
ommendations.
Engine lifetime
According to manufacturer’s
recommendations.
Clean before differential pressure has
increased 50% compared to sea trial
value.
64,000
96,000
96,000
96,000
Check timing and adjustment
Do not open bearings unless
bearing material fragments fall out or
other bearing inspection measures
indicate so.
Check clearances and crankshaft
deflection: once a year.
Check bearing edges by wire gauges:
once a year
Tighten rods and screws:
once a year
Tighten: once a year
According to manufacturer’s
recommendations.
Cleaning:
based on engine observations
Check movement at every
scavenge port inspection.
Cleaning:
based on engine observations
Cleaning: 32,000
Flaps and butterfly
valves in scavenge air
receiver
Various fuel and
lubricating oil filters
Lubricating oil bottom
tank
Chains
Typically done at 5 years docking
96,000New or overhauled chains to be
checked/retightened after 500, 1,500
hours.
Replace membranes after 5 years
32,000
64,000
64,000
64,000
96,000
Replace after 5 years
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Retighten chains: 3,000-4,000
- every six months
N2 pressure
Rubber membranes:
3,000
32,000
Accumulators on
HPS and HCU
Hydraulic hoses
Angle encoder
Marker sensor
MPC, MOP A, MOP B
Cables
Engine lifetime
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
6,000
6,000
6,000
6,000
Guiding Overhaul Intervals. Page 3 of 7 pages
Service Letter SL09-509/SBJ
ME/ME-C engines
Guiding overhaul intervals and expected service life
Component
Cylinder liner
Overhaul interval (hours)
Bore sizes
98-80
Bore sizes
70-50
24,000
16,000
24,000
16,000
24,000
Expected service life (hours)Remarks
Bore sizes
98-90
80-65
60-50
Bore sizes
98-80
Bore sizes
70-50
Bore sizes
98-90
80-65
60-50
80,000
70,000
60,000
Check the overall cylinder condition
through the scavenge ports at least
once a month.
Piston ringsBore sizes
98-80
Bore sizes
70-50
24,000
16,000
80,000
70,000
60,000
Pressure test at every 2
nd
piston
overhaul, recondition/rechrome when
required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Piston crownBore sizes
98-90
Bore sizes
70-50 16,000
Stuffing boxBore sizes
98-80
70-50
24,000
16,000
Check lamellas
32,000
32,000
Renew lamellas
Bore sizes
98-60
Nimonic exhaust valve
Normally, HVOF coated stems need
no reconditioning.
100,000
Exhaust valve spindle
and bottom piece (cage)
Inspection of seat and air spring:
Bore sizes
98-50
First inspection 1)
Bore sizes
98-50
Subsequent inspections 2)
6,000
32,000
Usually only light grinding of seats is
To be obtained for Nimonic valve with required at subsequent inspections.
reconditioning of seat and possible
re-welding of disk underside1) Condition check
Inspection of air spring according
to instruction manual. Two or three
valves to be inspected.
2) Subseq. Inspection
Condition check + possible complete
overhaul. Max burn off rate of spindle
disc underside to be estimated and
calculated for lifetime of spindle.
All valves to be inspected.
Main hydraulic pump 32,000Engine lifetime Check and replace hydrostatic bear-
ings at overhaul. Check and replace
cylinder set and piston if required.
20,000
Replace valve after 20,000 hours
Replace sealings at overhaul
Replace static sealing rings at over-
haul.
64,000Check and replace if required
Proportional valve for
main hydraulic pump
Pressure relief valve for
main hydraulic pumps
Exhaust valve actuator
FIVA valve
Fuel valve
Fuel oil pressure booster
40,000
32,000
32,000
8,000
- depending on fuel quality
Engine lifetime
Engine lifetime
Valve nozzle
Spindle guide
16,000 Check and replace if required
16,000
64,000
Replace or recondition
Change piston rings on hydraulic pis-
ton and suction valve at overhaul.
32,000
- based on engine observations
Guiding Overhaul Intervals. Page 4 of 7 pages
Service Letter SL09-509/SBJ
ME/ME-C engines
Guiding overhaul intervals and expected service life
Component
Cylinder cover
Overhaul interval (hours)Expected service life (hours)Remarks
96,000Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve
Cylinder lubricator
Crosshead bearings
Main bearings
Crank bearings
Thrust bearings
Tie rods including
bracing screws
Holding down bolts
Turbocharger
Air cooler(s)
12,000
24,000
Engine lifetime
Engine lifetime
Engine lifetime
Engine lifetime
According to manufacturer’s
recommendations.
45,000
or according to manufacturer’s rec-
ommendations
Engine lifetime
According to manufacturer’s
recommendations.
Clean before differential pressure has
increased 50% compared to sea trial
value.
64,000
96,000
96,000
96,000
Check timing and adjustment
Do not open bearings unless
bearing material fragments fall out or
other bearing inspection measures
indicate so.
Check clearances and crankshaft
deflection: once a year.
Check bearing edges by wire gauges:
once a year
Tighten rods and screws:
once a year
Tighten: once a year
According to manufacturer’s
recommendations.
Cleaning:
based on engine observations
Check movement at every
scavenge port inspection
Cleaning:
based on engine observations
Cleaning: 32,000
Flaps and butterfly
valves in scavenge air
receiver
Various fuel and
lubricating oil filters
Lubricating oil bottom
tank
Chains
Typically done at 5 years docking
96,000New or overhauled chains to be
checked/retightened after 500, 1,500
hours.
Retighten chains: 3,000-4,000
- every six months
First inspection:
Subsequent inspections:
N2 pressure:
Rubber membranes:
Gear wheel drive for
hydraulic pumps
Accumulators on
HPS and HCU
Hydraulic hoses
MPC, MOP A, MOP B
CCU and ACU amplifiers
LVDT and LDI hydraulic
pump amplifiers
Fuel booster sensor
Exhaust valve sensor
Angle encoder
Marker sensor
Cables
500
Gear wheel: Engine lifetime
6,000
Gear wheel bearings:
3,000
32,000
Engine lifetime
96,000
Replace membranes after 5 years
32,000
64,000
64,000
64,000
64,000
64,000
64,000
64,000
96,000
Replace after 5 years
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Replace if failing
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
Visual inspection:
6,000
6,000
6,000
6,000
6,000
6,000
6,000
6,000
Guiding Overhaul Intervals. Page 5 of 7 pages
Service Letter SL09-509/SBJ
MC/MC-C engines
Guiding overhaul intervals and expected service life
Component
Cylinder liner
Overhaul interval (hours)
Bore sizes
98-50
46-26
16,000
12,000
Expected service life (hours)Remarks
Bore sizes
98-90
80-70
60-50
46-35
26
Bore sizes
98-50
46-26
Bore sizes
98-90
80-70
60-50
46-35
26
Bore sizes
98-50
46-26
80,000
70,000
60,000
50,000
40,000
16,000
12,000
80,000
70,000
60,000
50,000
40,000
32,000
24,000
Renew lamellas
Normally, HVOF coated stems need
no reconditioning.
50,000
Usually only light grinding of seats is
required at subsequent inspections.
1) Condition check
Inspection of air spring according
to instruction manual. Two or three
valves to be inspected.
2) Subsequent inspection
Condition check + possible complete
overhaul. Max burn off rate of spindle
disc underside to be estimated and
calculated for lifetime of spindle. All
valves to be inspected.
Pressure test at every 2
nd
piston
overhaul, recondition/rechrome when
required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Check the overall cylinder condition
through the scavenge ports at least
once a month.
Piston ringsBore sizes
98-50
46-26
Bore sizes
98-50
46-26
16,000
12,000
16,000
12,000
Piston crown
Stuffing boxBore sizes
98-50
46-26
16,000
12,000
Check lamellas
Exhaust valve spindle
and bottom piece (cage)
Inspection of seat and air spring:
Bore sizes
98-35
First inspection 1)
Bore sizes
50-35
Subsequent inspections 2)
Bore sizes
98-60
Subsequent inspections 2)
Bore sizes
50-35
DuraSpindle exhaust valve
Bore size
60
DuraSpindle or
Nimonic exhaust valve
6,000
100,000
16,000
To be obtained for DuraSpindle and
Nimonic valve with reconditioning of
seat and possible re-welding of disk
underside.
32,000
Actuator gear
Fuel valve
Fuel pump plunger and
barrel, suction valve,
puncture valve and
shock absorber
Cylinder cover
Hydraulic system
32,000
Valve nozzle
Spindle guide
Renew or recondition:
64,000
16,000 Check and replace if required
16,000
40,000
Change sealing rings on barrel,
plunger, puncture valve and suction
valve.
8,000
- depending on fuel quality
16,000
- based on engine observations
8,000
For suction valve and puncture valve
96,000Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve, safety
valve and indicator cock
12,000
Engine lifetime
Guiding Overhaul Intervals. Page 6 of 7 pages
Service Letter SL09-509/SBJ
MC/MC-C engines
Guiding overhaul intervals and expected service life
Component
Alpha Lubricator
Crosshead bearings
Main bearings
Crank bearings
Thrust bearings
Roller guide for fuel
pump and exhaust valve
Chains
Overhaul interval (hours)
Check/ Refill accumulators
Overhaul lubricators
8,000
32,000
Expected service life (hours)Remarks
Engine lifetime
Engine lifetime
96,000
64,000
96,000
96,000
96,000
Do not open bearings unless
bearing material fragments fall out or
other bearing inspection measures
indicate so.
Check running surfaces and free ro-
tation of roller.
New or overhauled chains to be
checked/retightened after 500, 1,500
hours.
First inspections and retightenings
after 500, 1,000 and 1,500 hours in
total service.
Pneumatic/hydraulic governor:
Oil change every 4,000 hours.
Check clearances and crankshaft
deflection: once a year.
Check bearing edges by wire gauges:
once a year
Check condition in situ:
Tighten chains:
Visual inspection:
1,500
3,000-4,000
- every six months
3,000-4,000
Chain wheels and rub-
ber guide bars
Reversing and regulat-
ing gear
Tie rods including brac-
ing screws
Holding down bolts
Turbocharger
Air cooler(s)
Chain wheels:
Guide bars:
Engine lifetime
96,000
32,000
Check moving parts:
3,000-4,000
Engine lifetime
Engine lifetime
According to manufacturer’s
recommendations.
45,000
Tighten rods and screws:
once a year
Tighten: once a year
According to manufacturer’s
recommendations.
Cleaning:
based on engine observations
Check movement at every scavenge
port inspection.
Cleaning:
based on engine observations
According to manufacturer’s
recommendations.
Clean before differential pressure
has increased 50% compared to sea
trial value.
Flaps and butterfly
valves in scavenge air
receiver
Various fuel and lubri-
cating oil filters.
Camshaft filters and
TCS filters, if any
Lubricating oil bottom
tank
Engine lifetime.
Cleaning: 32,000
Typically done at 5 years docking
Guiding Overhaul Intervals. Page 7 of 7 pages