Piston Rings and Grooves
Inspection / Checking
A5.05. 02.07.01.01
30000, 7500
M20
en / 31.05.2010 IB021477 1/3
02
See also: 01.06.01.nn, 02.04.01.nn, 02.06.01.nn
Spare parts list: B1.05.02.2.2617
Time requirement: 1 Pers./ 0,50 h
Personnel qualification: Chief engineer / skilled engine hand
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Operating medium: Heavy fuel
Inspection:
of one piston and its rings after 7,500 h
Maintenance:
of all pistons and their rings after 30,000 h
Tools:
Piston ring expander W1 2.9227-A
Sequence of operations:
1. Piston inspection (7,500 h)
1.1 Open all crankcase doors.
1.2 Check the running surfaces of the cylinder liners from the crank chamber.
1.3 Draw the piston from the liner with worst running pattern (02.06.01.nn).
Draw the other pistons too, if the piston rings are stuck or rotten.
NOTE
f the running surfaces of all cylinder liners are without scores or high spots or any
other damage and if the parts of the drawn piston are in proper condition, all piston
rings free and no heavy wear can be detected, the inspection of the others pistons
can be postponed to a later date, but not beyond a maximum of 30,000 operating
hours. During the inspection, pay special attention to any sharp edges of the rings,
ring tension or rings sticking due to carbon deposits.
Do not remove graphite coating on the piston skirt.
After fitting new piston rings, the engine must be driven in according to the driving-in
regulation A3.10.01.nn!
Built-up pistons with chrome-plated 1st ring groove may only be reconditioned by the
manufacturer.
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