Cylinders — Checking for wear (Scorpio 1)

Theoretically, a new cylinder is perfectly round. The piston's work causes wear on the walls at right angles to the piston pins due to lateral load. This wear occurs mainly in this section of the cylinder due to friction against the piston rings.

The first signs of wear can be noticed by feeling a step just near the top of the cylinder where the top piston ring reaches. If there is no such step, then the cylinder wear is insignificant and there are no losses due to lack of compression or excessive oil consumption due to wear or damage to the piston rings or pistons.

If you have a special micrometer for measuring the cylinder, measure the diameter of the cylinder in the plane below the top edge of the cylinder block, as well as the diameter of the hole in the bottom of the cylinder in the same plane.

If any of the cylinders have noticeable scratches or grooves, it also requires reboring. This phenomenon usually indicates damage to the piston or rings. If at least one of the cylinders requires reboring, it is necessary to perform this operation on all cylinders and install new pistons and piston rings of the repair size.