Piston Rings and Grooves
Inspection / Checking
A5.05. 02.07.01.03
30000, 7500
M20
en / 31.05.2010 IB022421 3/3
02
1.11 Determine the clearance by calculation and check it against the table.
Ring thicknes h
R
Groove width h
N
Limit of h
N
- h
R
Groove Nominal Wear limit mm
mm mm
1 – 2 4.95 5.6 0.65
3 6 6.5 0.5
1.12 Fit piston rings with the marking facing
upwards (Fig. 3/X) and with the ring stops
into the ring grooves alternatingly opposite
in engine longitudinal direction.
2. Maintenance (30,000 h)
2.1 Draw all pistons (02.06.01.nn).
2.2 Check the state of lubrication and
appearance of the running surface of the
piston and clean it.
2.3 Remove the piston rings with piston ring
expander (Fig. 1/W1). Maintain previous
position of the rings referring to the
mounting position of the piston given in the
measuring sheet.
2.4 Clean all ring grooves.
2.5 Measure the groove width h
N
in
accordance with sequence of operations
1.9.
2.6 Renew all compression and scraper rings.
2.6.1 Fit piston rings with the marking facing
upwards (Fig. 3/X) and with the ring
stops into the ring grooves
alternatingly opposite in engine
longitudinal direction.
2.7 Fit all pistons (02.06.02.nn).
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