MAK M20, Руководство по эксплуатации

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Piston Rings and Grooves
Inspection / Checking
A5.05. 02.07.01.03
7500, 30000
M20
en / 16.07.2001 IB022421 3/3
02
Ĺ
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
).
Fig. 3
X