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08-18-2015, 10:10 AM | #1 |
Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Loose rod bearing
Hi I'm putting together a yamaha 285cc g2 motor. The top end needs rebuilding I put new piston rings fresh bored cylinder. Joined the connecting rod and crank only to find out rod is loose on the crank after torque is there any way I can hone the mating surfaces of the connecting rod to tighten a thousands or two.
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08-18-2015, 10:43 AM | #2 |
Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: Loose rod bearing
I guess I would need to hone it after words to bring it back to sise so answered my own quistion. Lol I was just ting to think of somthing instead of spending hundreds at machine shop.
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08-18-2015, 06:07 PM | #3 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Loose rod bearing
No, there were three possible bearings to use. It is difficult to judge the marking on the crank for which to use. This system allowed them to make use of more of their crank castings (i believe that was their reasoning). I usually advise to buy all three sizes & return the 2 that werent needed. You need 2 of each part number for bearing (each one is half the bearing). Avoid machine shop on this one if possible, it will make it even more confusing. J38-11656-00, J38-11656-10, J38-11656-20 were the part numbers. Remember, 2 of each.
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08-18-2015, 06:42 PM | #4 |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,862
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Re: Loose rod bearing
Your to nice CG, I would never take back rod bearings Plastigage would be the best test. In my experiance -10's work the most often.
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08-19-2015, 02:24 PM | #5 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Loose rod bearing
Or just consider the $24 worth of un-needed bearings part of the cost of the rebuild.
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08-19-2015, 04:49 PM | #6 |
Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: Loose rod bearing
Thanks so much I got the motor back together crank checked out. And back in today for some reason the thing acts like the timing is off back fires like crazy and like clock work it has a ruthenium to the backfire. Then all of a sudden starts up runs fine at high and low rpm. But if it dies very hard to get started again I'm going to start with engine grounding. I think I've had issue like this before.
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08-20-2015, 07:08 AM | #7 |
Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: Loose rod bearing
Well I tried ground strap strait to valve cover still have very weak spark?
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