Piston
Maintenance / Disassembly
A5.05. 02.06.01.02
M20
en / 28.01.2000 IB004756 2/3
02
Ĺ
Procedure:
1. Turn the crank pin with the turning rod (W3) approx. 20°in front of the top section to the
control side.
2. Remove the cylinder head (01.06.01.nn)
3. Place a used sealing ring (1) as sealing surface protection on the cylinder sleeve (4).
4. Position sleeve supports (W1) on the used sealing ring (1) as shown in the drawing.
5. Hand-tighten the round nuts (2).
Attention:
The sealing surfaces of the sleeves must be protected from damage!
6. Fill the annular gap between the piston (3) and the cylinder sleeve (4) with grease.
7. Carefully scrape off the accumulated coke in the cylinder sleeve between the top section of
the 1st piston ring and the lower edge of the calibration ring (5) and remove so that the
shoulder of the calibration ring can be clearly felt all round.
Note:
Take care not to damage the cylinder sleeve surface!
8. Lightly spray the annular gap between the calibration ring and the cylinder sleeve (4) with
deruster.
9. Allow the deruster to take effect.
10. Insert the disassembly unit (W4) so that the recess (Z) is inside the calibration ring (5).
11. Lightly tension the disassembly unit (W4) by turning the spindle nut (6).
12. Force out the calibration ring (5) by turning up the piston (3) into the top position.
13. Recut the threaded hole (M12, 11 mm deep) in the top of the piston.
14. Insert the eye screw (W2) in the piston (3).
15. Remove the cover of the connecting rod bearing (02.04.01.nn).
16. Attach the crane to the eye screw (W2) and slowly remove the piston (3).
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