Does anyone know , is blue the thickest one and is the thickness descend or ascend from there? I have read that Sean M recomends blue for older rebuilds. I am in a rebuild now . Any thoughts. Thanks in advance.
engine bearings
- Thread starter wayne billings
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Short answer - don't know.
Possibly a daft question but have you established that the clearances are out of spec? i.e. plasti-gauged?
If they are have you measures the journals?
IMO it isn't a case of slapping the thickest bearing in and hoping for the best.
Possibly a daft question but have you established that the clearances are out of spec? i.e. plasti-gauged?
If they are have you measures the journals?
IMO it isn't a case of slapping the thickest bearing in and hoping for the best.
Sorry for not knowing every thing I thought this was a place for learning. So you do know that the blue bearing is thickest.
Yamaha used to publish the size of shafts, housings and bearings in parts books such as that for the XS1100 and for that model at least the blue bearing was the thickest. Table two here appears to be incomplete, but you can see enough to know that blue is thickest anyway.
Who does know everything? To reiterate my previous answer, I don't know which is the thickest.
IMO it doesn't matter which is the thickest bearing. What does matter is that whichever bearing you fit gives the correct clearance - 0.021 to 0.043 for the connecting rods and 0.020 to 0.044 for main bearings.
As you have no doubt read, how this is established is explained in the Service manual. I would assume that provided the journals are within spec then you can use the methodology to establish which bearings you need.
It would also be helpful if you explain what you have already done so those trying to help don't go over the ground you have already covered.
Without this we are left to second guess the purpose of the question.
Max The word daft means stupid.
Thank you for the English lesson.
Apart from the fact the you stated you were a 'rebuilder' and with no other facts I was merely trying to establish why you are replacing the bearings and what leads you to thinking it is necessary.
I'd hope that someone would check bearing clearances and journal dimensions before replacing them...but there are some daft individuals out there who don't.
I was merely trying to confirm that you weren't one of them.
Max thanks for clearing that up.
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