13. Check to ensure that the gudgeon pin can be turned easily by hand. If
the gudgeon pin cannot be turned easily, assemble the gudgeon pin
again.
NOTICE!
Damage due to faulty piston rings
Do not continue using used piston rings. Doing so will lead
to damage to the piston and cylinder liner within a short
period of time.
– Only re-install pistons with new piston rings.
1. Remove all piston rings from the piston using piston ring pliers.
2. Clean the pistons thoroughly using an oil-dissolving fluid (e.g., kero-
sene).
3. Measure the cylinder liners and cylinder wear as described in
Ä
Chapter 4.1.6.1 ‘Checking pistons and cylinders’ on page 40.
4. Insert new piston rings in the grooves on the piston.
Note the correct position of the piston rings.
Ä
Figures
in the spare parts catalogue.
Piston rings with an asymmetrical cross-section have a
marking on one side. This marking must point to the
cylinder head during installation.
5. Position the piston rings so that the joint gaps are offset.
The piston rings can be secured in position using
grease.
1. Thoroughly clean the sealing surfaces on the cylinder foot.
2. Insert a new cylinder foot gasket.
3. Clean the connecting rod and crankshaft pins with a lint-free cloth.
4. Lubricate the piston, cylinder, crankshaft and connecting rod.
5. Position the cylinder with the cylinder foot side facing upwards.
6. Carefully slide the piston into the cylinder from above.
Do not tilt the piston.
If there is too much resistance on insertion, check the
position of the piston rings.
Replacing the piston
rings
Installing cylinder with
piston and connecting
rod upper sections
38 | WP5000 Basic WA 41013675 en GB 20190916
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