1028H60 PISTON, PIN SET - REPLACE - Alfa - 156 - eLearn

3239080 - 1028H60 piston, pin set - replace

) 1. Remove the circlips.2. Remove the pins (2a) and separate the connecting rods (2b) from the pistons (2c).3. Remove the piston rings (3a) from the pistons using a suitable tool (3b).

Reassembling ( Dismantling

) Check the alignment of the connecting rods using a suitable tool; if the connecting rod is not perfectly aligned, replace it.Check that the difference in weight between the connecting rods, complete with bearing shells, caps and bolts, is within the recommended values.

The arrows in the diagram show the areas where material can be removed from in order to equalize the weight.

	Measurement		Value
-	Maximum difference in weight between connecting rods (g.)		± 5

Check that the difference in weight between the pistons is within the recommended values.

	Measurement		Value
-	Maximum difference in weight between pistons (g.)		± 5

If the weight difference between pistons is not as specified, replace the worn parts.Fit the piston rings on the pistons using a suitable tool.

Fit the piston rings on the piston so that the word TOP stamped on them is turned toward the piston crown.

From September 2003, piston rings with a modified profile will be used. The piston ring for the 1st groove and the piston ring for the 2nd groove are the same thickness (1.19 mm); follow the diagram shown below to fit them correctly.

1. Join the connecting rods to the pistons so that safety notch (1a) on the big end of the connecting rod for the relevant half-bearing is on the side indicated by the arrow (1b) stamped on the piston skirt.

Refit the pins and secure using piston rings.