Piston Rings and Grooves
Inspection / Checking
A5.05. 02.07.01.01
7500, 30000
M20
en / 16.07.2001 IB021477 1/3
02
Ĺ
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
Note:
If 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.
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.
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