Rebuild or...
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Joined: Feb 2006
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Rebuild or...
I have a 390 I just bought and I pulled the pan and looked at one of the rod bearings after taking off one of the caps and it was tapered to one side in the middle with some copper showing. Should these be replaced? I really don't want to overhaul the motor at this time. If so can I just put .010 in again? Thats what they are now. I( don't want to pull the crank to have it ground down or nothing.
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Well if you have taper in the bearing..either the rods werent re-sized when the crank was ground bt .010"... Or the crank has a taper in it..... Both of wich will throw off bearing crush...
But if your just trying to Limp it along..change the bearing and go on about your biz..But thats not the proper way to do it?? But its your motor... JMO..
RJ
But if your just trying to Limp it along..change the bearing and go on about your biz..But thats not the proper way to do it?? But its your motor... JMO..
RJ
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Generally, as the bearing wears, the grey wears away and shows copper, and even in completely stock original-from-the-factory motors, the copper will start showing on one side first. Probably the line-bore is a little off.
I'm assuming the motor didn't knock before you did this?
Sounds like normal wear - how does the crank look? Is it scored? Or shiny and perfect?
Just throw another bearing in there... but what you're looking at is just normal wear... probably
Unless that taper is really obvious, like you can feel it with your fingers...
I'm assuming the motor didn't knock before you did this?
Sounds like normal wear - how does the crank look? Is it scored? Or shiny and perfect?
Just throw another bearing in there... but what you're looking at is just normal wear... probably
Unless that taper is really obvious, like you can feel it with your fingers...
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
If you were enthusiastic and you have a micrometer, you could pull the crank and check for out of round and taper. That might tell you something.
But yeah, if you're in a hurry slide the new bearings in and go about your business.
But yeah, if you're in a hurry slide the new bearings in and go about your business.
