Piston
Maintenance / Disassembly
A5.05. 02.06.01.01
M20
en / 04.09.1998 IB004750 2/3
02
Ĺ
Attention:
The sealing surfaces of the cylinder liner have to be protected against damage!
6. Fill the ring gap between piston (3)and cylinder liner (4) with grease.
7. Carefully scrape off and completely remove carbon deposits in the liner (4) ) between TDC
of the first piston ring and the lower edge of the calibrating ring (5).
Note:
Do not damage the surface of the liner !
8. Clean the groove in the calibrating ring (5).
9. Spray a thin film of rust removal spray „Caramba“ in the ring gap between calibrating ring
(5) and liner (4).
10. Allow the rust removal spray to react.
11. To loosen the calibrating ring (5) slightly beat it with a copper hammer until you can turn
the guide of the calibrating ring by hand.
12. Turn piston (3) with turning rod (W3) approx. 50° to TDC.
13. Insert thrust ring (W1.2) and compressed snap ring (6) until the lower edge rests on the pi-
ston.
14. Carefully turn piston (3) and thrust ring (W1.2) upwards until the snap ring (6) is engaged
in the groove of the calibrating ring (5).
15. Turn piston (3) further upwards and press out the calibrating ring (5. ). Watch the position
of the calibrating ring.
Attention:
In case the calibrating ring is tilted, you have to lower the piston and align the calibrating
ring.
The connecting-rod must not strike on the crank pin. Turn crank pin aside, if necessary.
16. Remove calibrating ring (5) and thrust ring (W1.2).
17. Dismount big-end bearing cover (02.04.01.nn).
18. Turn piston (3) in TDC position, re-tap threaded hole (M12, 11 mm deep) in piston head.
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