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Neil Harvey Neil Harvey is offline
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Join Date: May 2004
Posts: 194
The wear patter on the rod bearing is somewhat typical of a bearing shell that has little eccentricity. The bearings used in these engines have none or little form memory. However, it should be mirrored on the opposite shell, so check. Otherwise it can be indicative of several other issues.

Check the BE size as this type of pattern is often from excessive bearing crush. It usually shows further down towards the mid point, but it is worth checking. It would also be a good idea to check that the rod is not bent. Bearings show up the problems within the engine rotating assy, so don't leave anything to chance. Check everything.


The pin bushings look typical of pin bushings in these engines. If the clearance measured is 0.020mm (0.0008") this is on the low or tight side. Nothing wrong here, but expect to see some wear as you have less clearance for an oil film. It is only the oil film that keeps the pin off the bushing when running. Just make sure there is not flaking and the pin bushing is round. You could have them honed which will give a good finish and open up the clearance. By adding a few tenths, here will not hurt. Some engines that show hard wearing can have as much as 0.002" clearance.
Old 06-16-2018, 02:20 PM
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