Oil Consumption Test: Reconditioning
Replacing piston rings
A corrective action is to replace the two lower piston rings (scraper ring and oil ring).
If the upper piston ring (compression ring) is undamaged it must not be replaced. Increased oil consumption may result if the compression ring is replaced.
Check that the upper piston ring (compression ring) faces the right way.
It is important that the uppermost and center rings are installed the correct way up.
The lower ring can be installed any way up.
Distribute the piston ring openings as follows.
Early version
A. Compression ring
This is marked with text or with a circle. The marking must be facing upwards. It may be difficult to read the text, a magnifying glass may be required.
B. Scraper ring
The cut out must be turned downwards. The text must be on the top of the ring.
C. Oil ring
Earlier versions of the oil ring are not marked and can be installed any side up.
Later versions of the oil ring are divided into 3 sections. These slotted rings can be installed with either side facing up.
New versions of the piston ring assembly cannot be combined with earlier versions of the piston
Late version