Wearing Parts
MAN Diesel & Turbo Service Letter SL-509 pro-
vides Guiding Overhaul Intervals and expected
service life for key engine components.
The wearing parts expected to be replaced at the
service hours mentioned in the Service Letter are
listed in the tables below.
Table 19.08.01a: Wearing parts according to Service Letter SL-509
Service hours
8,000
12,000
16,000
20,000
24,000
32,000
36,000
40,000
48,000
56,000
60,000
64,000
72,000
80,000
84,000
88,000
96,000
Description
Replace parts
Piston
Soft iron gasket (1 set per cylinder) x x x x x x
Piston crown (1 pc per cylinder) x
O-rings for piston (1 set per cylinder) x
Piston rings (1 set per cylinder) x x x x x x
Piston cleaning ring (1 pc per cylinder) x
Stuffing box
Lamellas (1 set per cylinder) x x x
Top scraper ring (1 pc per cylinder) x x x
O-rings (1 set per cylinder) x x x x x x
Cylinder liner x
O-rings for cylinder liner (1 set per cylinder) x
O-rings for cooling water jacket (1 set per cylinder) x
O-rings for cooling water connections (1 set per cyl.) x
Exhaust valve
DuraSpindle (1 pc per cylinder) x x
Nimonic spindle (1 pc per cylinder) x
Bottom piece (1 pc per cylinder) x x
Piston rings for exhaust valve & oil piston (1 set per cyl.) x x
O-rings for bottom piece (1 set per cylinder) x x x x x x x
Fuel valves
Valve nozzle (2 sets per cylinder) x x x x x x
Spindle guide (2 sets per cylinder) x x x x x x
O-ring (2 sets per cylinder) x x x x x x x x x x x x
Spring housings (1 set per cylinder) x
Bearings
Crosshead bearing (1 set per cylinder) x
Crankpin bearing (1 set per cylinder) x
Main bearing (1 set per cylinder) x
Thrust bearing (1 set per engine) x
Cylinder cover (1 pc per cylinder) x
O-rings for cooling water jacket (1 set per cylinder) x x x x x x
O-ring for starting valve (1 pc per cylinder) x x x x x x x x
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