Pistons, Piston Pins and Rings

Pistons, Piston Pins and Rings






Disassembly

1. Remove connecting rod bearings (6211) from connecting rod (6200) and cap.
2. Remove piston rings using a suitable piston ring expander.
3. Mark pistons (6108) to ensure assembly with same connecting rod and installation in same cylinders from which they were removed.






4. Using an arbor press and Piston Pin Remover and Replacer T68P-6135-A, press piston pin (6135) from piston and connecting rod.

Assembly

NOTE: The piston pin bore of a connecting rod and diameter of piston pin must be within specification. Refer to Specifications.

1. Check the fit of a new piston in the cylinder bore before assembling piston and piston pin to connecting rod.
2. Apply light coat of clean engine oil to all parts.






3. Start piston pin in piston and connecting rod (this may require a very light tap with a mallet). Using an Arbor Press and Piston Pin Remover and Replacer T68P-6135-A, press piston pin through piston until the piston pin is centered.
4. Check end gap of all piston rings. It must be within specification. Follow instructions contained on piston ring package and install piston rings.
5. Check piston ring side clearance of compression rings with Feeler Gauge D81L-4201-A or equivalent, by inserting it between piston ring and its lower land. This gauge should slide freely around entire piston ring circumference without binding. Any wear that occurs will form a step at inner portion of lower land. If lower lands have high steps, piston should be replaced.
6. Ensure connecting rod bearings and bearing bore in connecting rod and cap are clean. Foreign material under connecting rod bearings will distort connecting rod bearings and cause a failure. Install connecting rod bearings in connecting rod and cap with tangs fitting in slots provided.