Service Letter SL2017-643/SRJ

Action code: WHEN CONVENIENT

Guiding Overhaul Intervals

Updated Tables

SL2017-643/SRJ
March 2017

This Service Letter replaces

SL2009-509/SBJ

Dear Sirs Concerns

Owners and operators of MAN B&W
Based on the latest service experience and engine development two-stroke marine diesel engines.
we are pleased to issue a revised version of the Guiding Overhaul Type: ME-GI, ME/ME-C, ME-B and
Intervals tables. The guiding overhaul intervals apply to electronically MC/MC-C.
controlled ME type engines, dual fuel ME-GI type engines, and me-
chanically controlled MC types engines.
Summary
Note that the intervals given in the tables apply only to engines with Overhaul intervals and expected ser-
so-called high topland pistons. High topland pistons are designed vice life of engine components on two-
with a significantly higher topland than ringland. stroke low speed engines with high
topland pistons.
Longer overhaul intervals can be obtained with a condition-based
overhaul strategy. The means to obtain and document this are de-
scribed in SL07-483/HRR.

In addition, it must be noted that the application of, for example,

WHR, EGB, EGR and SCR will affect the heat load on the combus-
tion chamber components. The above factors as well as fuel qualities
may have an impact on the overhaul intervals of especially, but not
exclusively, the exhaust valve parts.

Please direct any inquiries and questions regarding the overhaul

tables and condition-based overhaul to our:

Operation Department at: leo@mandiesel.com, or

Service Department at: dt-cph@mandiesel.com.

Yours faithfully

Mikael C Jensen Stig B Jakobsen

Vice President Senior Manager
Engineering Operation

Head office (& postal address) PrimeServ Production Forwarding & Receiving MAN Diesel & Turbo
MAN Diesel & Turbo Teglholmsgade 41 Teglholmsgade 35 Teglholmsgade 35 Branch of MAN Diesel & Turbo SE,
Teglholmsgade 41 2450 Copenhagen SV 2450 Copenhagen SV 2450 Copenhagen SV Germany
2450 Copenhagen SV Denmark Denmark Denmark CVR No.: 31611792
Denmark Phone: +45 33 85 11 00 Phone: +45 33 85 11 00 Phone: +45 33 85 11 00 Head office: Teglholmsgade 41
Phone: +45 33 85 11 00 Fax: +45 33 85 10 49 Fax: +45 33 85 10 17 Fax: +45 33 85 10 16 2450 Copenhagen SV, Denmark
Fax: +45 33 85 10 30 PrimeServ-cph@mandieselturbo.com manufacturing-dk@mandieselturbo.com shipping-cph@mandieselturbo.com German Reg.No.: HRB 22056
info-cph@mandieselturbo.com Amtsgericht Augsburg
www.mandieselturbo.com
Service Letter SL2017-643/SRJ

ME-GI Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Cylinder liner Bore sizes Bore sizes Check the overall cylinder condition
95-80 24,000 95-80 80,000 through the scavenge ports at least
70-45 16,000 70-65 70,000 once a month.
60-45 60,000
Piston rings Bore sizes Bore sizes
95-80 24,000 95-80 24,000
70-45 16,000 70-45 16,000
Piston crown Bore sizes Bore sizes Pressure test at every 2nd piston
95-80 24,000 95-80 72,000 overhaul, recondition/rechrome when
70-45 16,000 70-45 48,000 required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Stuffing box Bore sizes Bore sizes Overhaul follows the piston rings over-
95-80 24,000 95-80 48,000 haul but can be extended based on
70-45 16,000 70-45 32,000 observations.
check lamellas renew lamellas
Exhaust valve spindle Bore sizes Bore sizes 1)
First inspection
and bottom piece (cage) 95-60 95-60 96,000 Condition checking of air spring ac-
First inspection1) 6,000 50-45 64,000 cording to the instruction manual.
Subsequent inspections2) 24,000 Inspection of spindles and seats.
To be obtained for DuraSpindle and Maximum burn-off rate of spindle disc
Bore sizes Nimonic valve with reconditioning of underside to be estimated and calcu-
50-45 seat and possible rewelding of disk lated for lifetime of spindle.
First inspection1) 6,000 underside.
Subsequent inspections2) 16,000 2)
Subsequent inspections
Condition checking and complete
overhaul of exhaust valve.
For Dura-/Nimonic spindle possible
rewelding up to three times during
lifetime.
Usually only light grinding of seats is
required at subsequent inspections.
Exhaust actuator 24,000 64,000 Lifetime can deviate due to cavitation.
based on engine observations
Exhaust valve high 24,000 64,000 Lifetime can deviate due to cavitation.
pressure pipe
Main hydraulic pump 32,000 96,000 Check and replace hydrostatic bear-
ings during overhaul. Check and
replace cylinder set and piston if
required.
Proportional valve for 20,000 Replace valve after 20,000 hours.
main hydraulic pump
Pressure relief valve for 40,000 96,000 Replace sealings during overhaul.
main hydraulic pumps
FIVA 32,000 64,000 Check and replace if required.
ELVA 32,000 64,000 Check and replace if required.
ELFI valve 32,000 64,000 Check and replace if required.

Guiding Overhaul Intervals. Page 2 of 13 pages

Service Letter SL2017-643/SRJ

ME-GI Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Standard fuel valves 8,000 Valve nozzle 8,000 Check components and replace if
(except 10.2 engines): depending on fuel quality Spindle guide 16,000 required.
Non-return valve 16,000 Change O-rings.
Spring 32,000
Thrust spindle 16,000 For fuel valves tightened by torque
Foot 32,000 (without spring packs): Clean threads
Spring pack 16,000 on studs and ensure smooth operation
Holder 32,000 of nut – otherwise replace nut and/or
Head 32,000 fuel valve stud.
Fuel valves of latest de- 8,000 Valve nozzle 8,000 Check components and replace if
sign (10.2 engines and depending on fuel quality Spindle guide 16,000 required.
engines with updated Non-return valve 16,000
fuel valve design with Spring 32,000 Change O-rings, back-up ring and
guide rings). Thrust spindle 16,000 guide rings.
Foot 32,000
Spring pack 16,000
Guide rings 16,000
Back-up ring 16,000
Holder 48,000
Head 48,000
Fuel oil pressure booster 32,000 Replace or recondition 64,000 Change piston rings on hydraulic pis-
based on engine observations ton and suction valve at overhaul.
Fuel oil booster Inspection of seat and spring 32,000
throttle valve 16,000
Suction valve 8,000 16,000 Check for wear on seat and conical
ring.
LDCL pump 32,000 Change seals if required.
seals
Cylinder cover 96,000 Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve 12,000 96,000
Cylinder lubricator 24,000 96,000 Check timing and adjustment.
Crosshead bearings Check clearances and crankshaft 64,000 Do not open bearings unless
Main bearings deflection once a year. 96,000 bearing material fragments fall out or
Crank bearings Check bearing edges by wire gauges 96,000 other bearing inspection measures
Thrust bearings once a year 96,000 indicate so.
Tie rods including Tighten rods and screws once a year Engine lifetime
bracing screws
Holding down bolts Tighten once a year Engine lifetime
Turbocharger According to manufacturer’s recom- According to manufacturer’s recom- According to manufacturer’s recom-
mendations. mendations. mendations.
Air cooler(s) Cleaning: 45,000 Clean before differential pressure has
based on engine observations or according to manufacturer’s increased 50% compared to sea trial
recommendations value.
Flaps and butterfly Check movement at every scavenge 48,000 Periods with slow steaming may re-
valves in scavenge air port inspection. duce lifetime
receiver

Guiding Overhaul Intervals. Page 3 of 13 pages

Service Letter SL2017-643/SRJ

ME-GI Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Various fuel and lubri- Cleaning:

cating oil filters based on engine observations
Lubricating oil bottom Cleaning 32,000 Typically done at 5 years docking.
tank
Chains Retighten chains 3,000-4,000 96,000 New or overhauled chains to be
every six months checked/re-tightened after 500, 1,500
hours.
Gear wheel drive for First inspection 500 Gear wheel Engine lifetime
hydraulic pumps Subsequent inspections 6,000 Gear wheel bearings 96,000
Accumulators on HPS N2 pressure 2,000 Engine lifetime Replace membranes after 5 years.
and HCU Rubber membranes 32,000
Hydraulic hoses 32,000 Replace after 5 years.
MPC, MOP A, MOP B Visual inspection 6,000 64,000 Replace if failing.
Angle encoder Visual inspection 6,000 64,000 Replace if failing.
Angle encoder amplifiers Visual inspection 6,000 64,000 Replace if failing.
Fuel booster sensor Visual inspection 6,000 64,000 Replace if failing.
Exhaust valve sensor Visual inspection 6,000 64,000 Replace if failing.
Marker sensor Visual inspection 6,000 64,000 Replace if failing.
Cables Visual inspection 6,000 96,000
Gas injection valve 4,000 Valve nozzle 8,000 Check and replace if required.
nozzle Spindle guide 16,000
Control oil pipe 32,000 Engine lifetime Replace static O-rings at overhaul.
arrangement
Non-return valve 16,000 Replace or overhaul 32,000 Check spring and seat.
Window valve 8,000 16,000 Pressure – and function test.
High-pressure gas seal Replace at overhaul.
Replace sealing at overhaul.
Sealing oil pump N2 pressure 2,000 96,000 Replace membranes after 5 years.
N2 accumulator filter Rubber membranes 32,000
LPS booster pump 32,000 Change seals when required.
seals
Blow-off valve 32,000 64,000
Purge valve 32,000 64,000
Resume valve 32,000 64,000
ELWI 32,000 64,000
ELGI 32,000 64,000
Gas channel pressure 64,000 Replace if failing.
sensor
Chain pipe 16,000 32,000 Check for oil in outer pipe.
Gas block Engine lifetime Check insitu for gas tightness.
Non-return valve 8,000 Replace membrane after 5 years.
Accumulator 2,000

Guiding Overhaul Intervals. Page 4 of 13 pages

Service Letter SL2017-643/SRJ

ME/ME-C Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Cylinder liner Bore sizes Bore sizes Check the overall cylinder condition
98-80 24,000 98-90 80,000 through the scavenge ports at least
70-50 16,000 80-65 70,000 once a month.
60-50 60,000
Piston rings Bore sizes Bore sizes
98-80 24,000 98-80 24,000
70-50 16,000 70-50 16,000
Piston crown Bore sizes Bore sizes Pressure test at every 2nd piston
98-90 24,000 98-90 80,000 overhaul, recondition/rechrome when
70-50 16,000 80-65 70,000 required (typically every 24-32,000
60-50 60,000 hours). Piston crown can be recondi-
tioned by welding-up twice.
Stuffing box Bore sizes 32,000
98-80 24,000 32,000
70-50 16,000 renew lamellas
check lamellas
Exhaust valve spindle Bore sizes Bore sizes 1)
First inspection
and bottom piece (cage) 98-50 98-60 96,000 Condition check of air spring accord-
First inspection1) 6,000 ing to Instruction manual. Inspection
Bore size of spindle and seats. Max burn-off
Bore sizes 50 64,000 rate of spindle disc underside to be
98-60 estimated and calculated for lifetime
Subsequent inspections2) 24,000 To be obtained for DuraSpindle and of spindle.
Nimonic valve with reconditioning of
Bore size seat and possible re-welding of disk 2)
Subsequent inspection
50 underside Condition check and complete
Subsequent inspections2) 16,000 overhaul of exhaust valve.
For Dura/Nimonic spindle possible
rewelding up to three times during
lifetime.
Usually only light grinding of seats is
required at subsequent inspections.
Exhaust actuator 24,000 64,000 Lifetime can deviate due to cavitation.
based on engine observations
Exhaust valve high- 24,000 64,000 Lifetime can deviate due to cavitation.
pressure pipe
Main hydraulic pump 32,000 Engine lifetime Check and replace hydrostatic bear-
ings at overhaul. Check and replace
cylinder set and piston if required.
Proportional valve for 20,000 Replace valve after 20,000 hours.
main hydraulic pump
Pressure relief valve for 40,000 Engine lifetime Replace sealings at overhaul.
main hydraulic pumps

Guiding Overhaul Intervals. Page 5 of 13 pages

Service Letter SL2017-643/SRJ

ME/ME-C Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Standard fuel valves 8.000 Valve nozzle 8,000 Check components and replace if
(except 10.2 engines) depending on fuel quality Spindle guide 16,000 required.
Non-return valve 16,000 Change O-rings.
Spring 32,000
Thrust spindle 16,000 For fuel valves tightened by torque
Foot 32,000 (without spring packs): clean threads
Spring pack 16,000 on studs and ensure smooth operation
Holder 32,000 of nut – otherwise replace nut and/or
Head 32,000 fuel valve stud.
Fuel valves of latest de- 8,000 Valve nozzle 8,000 Check components and replace if
sign (10.2 engines and depending on fuel quality Spindle guide 16,000 required.
engines with updated Non-return valve 16,000
fuel valve design with Spring 32,000 Change O-rings, back-up ring and
guide rings) Thrust spindle 16,000 guide rings.
Foot 32,000
Spring pack 16,000
Guide rings 16.000
Back-up ring 16,000
Holder 48,000
Head 48,000
Fuel oil pressure booster 32,000 64,000 Change piston rings on hydraulic pis-
based on engine observations replace or recondition ton and suction valve at overhaul.
Suction valve 8,000 16,000 Check for wear at seat and conical
ring.
Cylinder cover 96,000 Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve 12,000 96,000
Cylinder lubricator 24,000 96,000 Check timing and adjustment.
Crosshead bearings Check clearances and crankshaft 64,000 Do not open bearings unless bearing
Main bearings deflection: 96,000 material fragments fall out or other
Crank bearings once a year 96,000 bearing inspection measures
Thrust bearings 96,000 indicate so.
Check bearing edges by wire gauges:
once a year
Tie rods including Tighten rods and screws: Engine lifetime
bracing screws once a year
Holding down bolts Tighten: Engine lifetime
once a year
Turbocharger According to manufacturer’s recom- According to manufacturer’s recom- According to manufacturer’s recom-
mendations. mendations. mendations.
Air cooler(s) Cleaning: 45,000 Clean before differential pressure has
based on engine observations or according to manufacturer’s increased 50% compared to sea trial
recommendations value.
Flaps and butterfly Check movement at every scavenge 48,000 Periods with slow steaming may re-
valves in scavenge air port inspection duce lifetime
receiver

Guiding Overhaul Intervals. Page 6 of 13 pages

Service Letter SL2017-643/SRJ

ME/ME-C Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Various fuel and lubri- Cleaning:

cating oil filters based on engine observations
Lubricating oil bottom Cleaning 32,000 Typically done at 5-year docking.
tank
Chains Retighten chains 3,000-4,000 96,000 New or overhauled chains to be
every six months checked/retightened after 500, 1,500
hours.
Gear wheel drive for First inspection 500 Gear wheel Engine lifetime
hydraulic pumps Subsequent inspections 6,000 Gear wheel bearings 96,000
Accumulators on HPS N2 pressure 2,000 Engine lifetime Replace membranes after 5 years.
and HCU Rubber membranes 32,000
Hydraulic hoses 32,000 Replace after 5 years.
MPC, MOP A, MOP B Visual inspection 6,000 64,000 Replace if failing.
CCU and ACU amplifiers Visual inspection 6,000 64,000 Replace if failing.
LVDT and LDI hydraulic Visual inspection 6,000 64,000 Replace if failing.
pump amplifiers
Fuel booster sensor Visual inspection 6,000 64,000 Replace if failing.
Exhaust valve sensor Visual inspection 6,000 64,000 Replace if failing.
Angle encoder Visual inspection 6,000 64,000 Replace if failing.
Marker sensor Visual inspection 6,000 64,000 Replace if failing.
Cables Visual inspection 6,000 96,000

Guiding Overhaul Intervals. Page 7 of 13 pages

Service Letter SL2017-643/SRJ

ME-B Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Cylinder liner Bore sizes Bore sizes Check the overall cylinder condition
60-50 16,000 60-46 60,000 through the scavenge ports at least
46-35 12,000 40-35 50,000 once a month.
Piston rings Bore sizes Bore sizes
60-50 16,000 60-35 16,000
46-35 12,000
Piston crown Bore sizes Bore sizes Pressure test at every 2nd piston
60-50 16,000 60-46 60,000 overhaul, recondition/rechrome when
46-35 12,000 40-35 50,000 required (typically every 24-32,000
hours). Piston crown can be recondi-
tioned by welding-up twice.
Stuffing box Bore sizes Bore sizes
60-50 16,000 60-50 32,000
46-35 12,000 46-35 24,000
check lamellas renew lamellas
Exhaust valve spindle Bore sizes Bore size 1)
First inspection
and bottom piece (cage) 60-35 60 Condition check of air spring accord-
First inspection1) 6,000 DuraSpindle or ing to Instruction manual. Inspection
Nimonic exhaust valve 96,000 of spindle and seats. Max burn-off
Bore sizes rate of spindle disc underside to be
50-35 Bore sizes estimated and calculated for lifetime
Subsequent inspections2) 16,000 50-35 of spindle.
DuraSpindle exhaust valve 64,000
Bore size 2)
Subsequent inspections
60 To be obtained for DuraSpindle and Condition check and complete over-
Subsequent inspections2) 24,000 Nimonic valve with reconditioning of haul of Exhaust valve.
seat and possible re-welding of disk For Dura/Nimonic spindle possible
underside rewelding up to 3 times during life-
time. Usually only light grinding of
seats is required at subsequent in-
spections.
Exhaust actuator 24,000 64,000 Lifetime can deviate due to cavitation.
based on engine observations
Exhaust valve high 24,000 64,000 Lifetime can deviate due to cavitation.
pressure pipe
Main hydraulic pump 32,000 Engine lifetime Check and replace hydrostatic bear-
ings at overhaul. Check and replace
cylinder set and piston if required.
Proportional valve for 20,000 Replace valve after 20,000 hours.
main hydraulic pump
Pressure relief valve for 40,000 Engine lifetime Replace sealings at overhaul.
main hydraulic pumps
ELFI valve 32,000 64,000 Check and replace if required.

Guiding Overhaul Intervals. Page 8 of 13 pages

Service Letter SL2017-643/SRJ

ME-B Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Standard fuel valves 8,000 Valve nozzle 8,000 Check components and replace if
(except 10.2 engines) depending on fuel quality Spindle guide 16,000 required.
Non-return valve 16,000 Change O-rings.
Spring 32,000
Thrust spindle 16,000 For fuel valves tightened by torque
Foot 32,000 (without spring packs):
Spring pack 16,000 clean threads on studs and ensure
Holder 32,000 smooth operation of nut – otherwise
Head 32,000 replace nut and/or fuel valve stud.
Fuel valves of latest de- 8,000 Valve nozzle 8,000 Check components and replace if
sign (10.2 engines and depending on fuel quality Spindle guide 16,000 required.
engines with updated Non-return valve 16,000
fuel valve design with Spring 32,000 Change O-rings, back-up ring and
guide rings) Thrust spindle 16,000 guide rings.
Foot 32,000
Spring pack 16,000
Guide rings 16,000
Back-up ring 16,000
Holder 48,000
Head 48,000
Fuel oil pressure booster 32,000 64,000 Change piston rings on hydraulic pis-
based on engine observations replace or recondition ton and suction valve at overhaul.
Suction valve 8,000 16,000 Check for wear at seat and conical
ring.
Cylinder cover 96,000 Check for burned grooves at fuel valve
nozzle holes.
Weld-up if required, up to 2-3 times
during service life.
Starting valve 12,000 96,000
Cylinder lubricator 24,000 96,000 Check timing and adjustment
Crosshead bearings Check clearances and crankshaft 64,000 Do not open bearings unless
Main bearings deflection: 96,000 bearing material fragments fall out or
Crank bearings once a year, 96,000 other bearing inspection measures
Thrust bearings 96,000 indicate so.
Check bearing edges by wire gauges:
once a year
Tie rods including Tighten rods and screws: Engine lifetime
bracing screws once a year
Holding down bolts Tighten: Engine lifetime
once a year
Turbocharger According to manufacturer’s recom- According to manufacturer’s recom- According to manufacturer’s recom-
mendations. mendations. mendations.
Air cooler(s) Cleaning: 45,000 Clean before differential pressure has
based on engine observations or according to manufacturer’s increased 50% compared to sea trial
recommendations value.
Flaps and butterfly Check movement at every scavenge 48,000 Periods with slow steaming may re-
valves in scavenge air port inspection. duce lifetime
receiver

Guiding Overhaul Intervals. Page 9 of 13 pages

Service Letter SL2017-643/SRJ

ME-B Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Various fuel and lubri- Cleaning:

cating oil filters based on engine observations
Lubricating oil bottom Cleaning: 32,000 Typically done at 5-year docking.
tank
Chains Retighten chains: 3,000-4,000 96,000 New or overhauled chains to be
every six months checked/retightened after 500, 1,500
hours.
Accumulators on HPS N2 pressure 2,000 Engine lifetime Replace membranes after 5 years.
and HCU Rubber membranes 32,000
Hydraulic hoses 32,000 Replace after 5 years.
Angle encoder Visual inspection 6,000 64,000 Replace if failing.
Marker sensor Visual inspection 6,000 64,000 Replace if failing.
MPC, MOP A, MOP B Visual inspection 6,000 64,000 Replace if failing.
Cables Visual inspection 6,000 96,000 Replace if failing.

Guiding Overhaul Intervals. Page 10 of 13 pages

Service Letter SL2017-643/SRJ

MC/MC-C Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Cylinder liner Bore sizes Bore sizes Check the overall cylinder condition
98-50 16,000 98-90 80,000 through the scavenge ports at least
46-26 12,000 80-70 70,000 once a month.
60-50 60,000
46-35 50,000
26 40,000
Piston rings Bore sizes Bore sizes
98-50 16,000 98-50 16,000
46-26 12,000 46-26 12,000
Piston crown Bore sizes Bore sizes Pressure test at every 2nd piston
98-50 16,000 98-90 80,000 overhaul, recondition/rechrome when
46-26 12,000 80-70 70,000 required (typically every 24-32,000
60-50 60,000 hours). Piston crown can be recondi-
46-35 50,000 tioned by welding-up twice.
26 40,000
Stuffing box Bore sizes Bore sizes
98-50 16,000 98-50 32,000
46-26 12,000 46-26 24,000
check lamellas renew lamellas
Exhaust valve spindle Bore sizes Bore sizes 1)
First inspection
and bottom piece (cage) 98-35 98-60 Condition check of air spring accord-
First inspection1) 6,000 DuraSpindle or ing to Instruction manual. Inspection
Nimonic exhaust valve 96,000 of spindle and seats. Max. burn-off
Bore sizes rate of spindle disc underside to be
98-60 Bore sizes estimated and calculated for
Subsequent inspections2) 24,000 50-35 lifetime of spindle.
DuraSpindle exhaust valve 64,000
Bore sizes 2)
Subsequent inspection
50-35 To be obtained for DuraSpindle and Condition check and complete over-
Subsequent inspections2) 16,000 Nimonic valve with reconditioning of haul of exhaust valve.
seat and possible re-welding of disk For Dura/Nimonic spindle possible
underside. rewelding up to three times during
lifetime.
Usually only light grinding of seats is
required at subsequent inspections.
Exhaust actuator 24,000 64,000 Lifetime can deviate due to cavitation.
based on engine observations
Exhaust valve high 24,000 64,000 Lifetime can deviate due to cavitation.
pressure pipe
Standard fuel valves 8,000 Valve nozzle 8,000 Check components and replace if
(except 10.2 engines) depending on fuel quality Spindle guide 16,000 required.
Non-return valve 16,000 Change O-rings.
Spring 32,000
Thrust spindle 16,000 For fuel valves tightened by torque
Foot 32,000 (without spring packs): clean threads
Spring pack 16,000 on studs and ensure smooth operation
Holder 32,000 of nut – otherwise replace nut and/or
Head 32,000 fuel valve stud.

Guiding Overhaul Intervals. Page 11 of 13 pages

Service Letter SL2017-643/SRJ

MC/MC-C Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Fuel valves of latest de- 8,000 Valve nozzle 8,000 Check components and replace if
sign (10.2 engines and depending on fuel quality Spindle guide 16,000 required.
engines with updated Non-return valve 16,000
fuel valve design with Spring 32,000 Change O-rings, back-up ring and
guide rings) Thrust spindle 16,000 guide rings.
Foot 32,000
Spring pack 16,000
Guide rings 16,000
Back-up ring 16,000
Holder 48,000
Head 48,000
Fuel pump plunger and 16,000 Renew or recondition 40,000 Change sealing rings on barrel,
barrel, suction valve, based on engine observations plunger, puncture valve and suction
puncture valve and valve.
shock absorber 8,000
for suction valve and puncture valve
Cylinder cover 96,000 Check for burned grooves at fuel valve
nozzle holes. Weld-up if required, up
to 2-3 times during service life.
Starting valve, safety 12,000 96,000
valve and indicator cock
Alpha Lubricator Check/refill accumulators 8,000 96,000
Overhaul lubricators 32,000
Crosshead bearings Check clearances and crankshaft 64,000 Do not open bearings unless bearing
Main bearings deflection: 96,000 material fragments fall out or other
Crank bearings once a year, 96,000 bearing inspection measures indicate
Thrust bearings 96,000 so.
Check bearing edges by wire gauges:
once a year
Roller guide for fuel Check condition in situ 1,500 Engine lifetime Check running surfaces and free ro-
pump and exhaust valve tation of roller.
Chains Tighten chains: 3,000-4,000 96,000 New or overhauled chains to be
every six months checked/retightened after 500, 1,500
hours.
Chain wheels and rub- Visual inspection 3,000-4,000 Chain wheels 96,000 First inspections and retightenings
ber guide bars Guide bars 32,000 after 500, 1,000 and 1,500 hours in
total service.
Reversing and regulat- Check moving parts 3,000-4,000 Engine lifetime Pneumatic/hydraulic governor:
ing gear oil change every 4,000 hours.
Tie rods including Tighten rods and screws: Engine lifetime
bracing screws once a year
Holding down bolts Tighten: Engine lifetime
once a year
Turbocharger According to manufacturer’s recom- According to manufacturer’s recom- According to manufacturer’s recom-
mendations. mendations. mendations.

Guiding Overhaul Intervals. Page 12 of 13 pages

Service Letter SL2017-643/SRJ

MC/MC-C Engines
Guiding Overhaul Intervals and Expected Service Life
Component Overhaul interval (hours) Expected service life (hours) Remarks

Air cooler(s) Cleaning: 45,000 Clean before differential pressure has

based on engine observations increased 50% compared to sea trial
value.
Flaps and butterfly Check movement at every scavenge 48,000 Periods with slow steaming may re-
valves in scavenge air port inspection. duce lifetime
receiver
Various fuel and lubri- Cleaning:
cating oil filters. based on engine observations
Camshaft filters and
TCS filters, if any
Lubricating oil bottom Cleaning: 32,000 Typically done at 5-year docking.
tank

Guiding Overhaul Intervals. Page 13 of 13 pages