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Piston Rings, Replace
 Remove
| 1. |
Remove piston with con-rod
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Important: Do not damage piston
and con-rod. Use protective jaws.
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| 2. |
Insert the piston and con-rod in the vice
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Important: The maximum spread at
the ring gap must not exceed dimension I ( 28 mm )
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| 3. |
Remove piston rings
| • |
Remove 3 piston rings with piston ring pliers (1)
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| 4. |
Check the piston ring gap with a feeler gauge
| • |
Insert the piston ring in the cylinder bore
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| • |
Permissible gap:
| – |
1st compression ring (1) 0,20 –
0,30 mm
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| – |
2nd compression ring (2) 1,00 –
1,50 mm
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| – |
Oil scraper ring (3) 0,25 – 0,50
mm
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| 5. |
Use feeler gauge to check piston ring axial clearance in piston
ring groove
| • |
Permissible axial clearance:
| – |
1st compression ring (1) 0,09 –
0,13 mm
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| – |
2nd compression ring (2) 0,04 –
0,08 mm
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| – |
Oil scraper ring (3) 0,03 – 0,07
mm
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Install
Important: The maximum spread at
the ring gap must not exceed dimension I ( 28 mm )
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| 6. |
Fit piston rings
| • |
Use piston ring tongs (1) to insert 3 piston rings in annular
groove
Note: Note markings on
piston rings
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| 7. |
Adjust piston ring gaps
| • |
Arrange piston ring joints offset by 120° with respect to each other
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| 8. |
Remove piston with con-rod from vice
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| 9. |
Install piston with con-rod 
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