Piston: Service and Repair

NOTE: Pistons are supplied complete with wrist pins as pins and pistons are matched assemblies it is not permissible to interchange component parts, If the original pistons and connecting rods are being reused, they must be replaced in the cylinder bore from which they were removed. If new pistons and connecting rods are being fitted they should be stamped with the number of the bore in which they are to be installed. Number 1 cylinder is at the rear of the engine.

REMOVE
- Remove the engine and gearbox assembly.
- Remove the gearbox and place the engine on an approved engine stand.
- Remove the cylinder head.
- Remove the oil pan.
- Remove the piston and connecting rods.
- Remove the circlips.
- Push the wrist pin out of the piston.
- Withdraw the connecting rod.

REFIT

NOTE:
- Connecting rods must be refitted to pistons in such a way that when installed in the engine the word 'FRONT' on the piston crown faces the front of the engine and the chamfer on the big-end eye faces the crank pin radius.
- The wrist pin should be a push fit in the piston at 2O°C (68°F). Fit will vary with ambient temperature.





Figure 44
- Fit the wrist pin (1, Fig 44) in the piston.
- Align the small-end (2, Fig 44) with the end of the wrist pin and push the pin home Use new circlips 13, Fig 44) to retain the wrist pin.
- Refit the pistons and connecting rods.