Thread: Main Bearing Wear
04-14-2012, 02:42 PM #1
Main Bearing Wear
I have the cases split to change the timing chain and found this wear pattern on one of the main bearings. I can actually feel a tiny ridge with my thumbnail. I assume these shouldn't go back in right? Less than 80 hours on this ski. It is a 2003 NA155 GTX.
Several other bearings have worn through the coating and are polished, but none with ridges. Opinion???
04-14-2012, 03:21 PM #2
- Join Date
- Jun 2008
- GREECE ATHENS , NAXOS
If I were you I change them with new ones.But first you must find out what caused this!!!I did a rebuilt on a running ski(cast to forged pistons only) and I replace them.Ski had 60 hours and run great!
04-14-2012, 03:26 PM #3
04-14-2012, 03:44 PM #4
04-14-2012, 04:26 PM #5
Its just from some metal particle that got between the bearing and the crank. Part of the bearings job is embedability. Its desigined to give and wear when needed if there is ever some debree in the oil so other parts will not get torn up like your crank. While alarming looking its normal to see things like this when disasembling an engine. Have your machine shop polish the crank, throw in a new set of bearings and go!!
04-15-2012, 07:49 AM #6
I am going to change them. They are not that expensive. I wonder what else I should pull apart now? Oil pumps and oil pressure regulator????!
04-15-2012, 08:36 AM #7
You're going to be in there anyway so you might as well go through everything. It's not that hard really.
04-15-2012, 08:38 AM #8
Yea, I'm thinking the same thing. Is there any negative to reusing the oil pressure regulator parts?
04-15-2012, 02:21 PM #9
04-15-2012, 03:47 PM #10
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