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Old 24-10-2011   #1
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Reuse or new big end rod bearings?

Hey guys,

Got the pistons back into the cylinder after doing a rehone. The head has been cleaned up and ready to go. But how do the condition of these big end connecting rod bearings look? I don't know how old they are.

What do you guys think before I order something that is still good.

Thanks,
Frank







































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Old 25-10-2011   #2
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Re: Reuse or new big end rod bearings?

They look pretty badly scored to me.

I would replace them as a minimum.

What's the crank shaft like?
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Old 25-10-2011   #3
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Re: Reuse or new big end rod bearings?

Quote Originally Posted by oopsadaisy View Post
They look pretty badly scored to me.

I would replace them as a minimum.

What's the crank shaft like?
I didn't really get a chance to inspect the crankshaft. What do you guys think of the quality of parts from Mr.Fiat
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Old 25-10-2011   #4
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Re: Reuse or new big end rod bearings?

I must admit that having gone this far, I'd be replacing them. You will need to get the bearing surfaces on the crank measured as well to see if they are worn.

Parts from Mr Fiat are OK.

Chris
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Old 26-10-2011   #5
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Re: Reuse or new big end rod bearings?

Quote Originally Posted by Bambino View Post
I must admit that having gone this far, I'd be replacing them. You will need to get the bearing surfaces on the crank measured as well to see if they are worn.

Parts from Mr Fiat are OK.

Chris
What should I be measuring for? Taper, out of round, and what else? I plan to get new rod bearings and do plasticguage to measure the clearance between crank and bearing.

Here are some pictures of the crank in the engine.























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Old 26-10-2011   #6
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Re: Reuse or new big end rod bearings?

Mainly out of round because as the engine is fundamentally unbalanced the crank bearing surfaces will wear eccentrically.
I took mine to the local Engineering works and they ran the electronic calipers over it. As it was within tolerance, I just replaced the main and big end bearings.

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Old 26-10-2011   #7
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Re: Reuse or new big end rod bearings?

I would have said 'eccentrically' but I neither know how to spell it or know what it means!

There are some very clever and helpful people here.

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Old 26-10-2011   #8
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Re: Reuse or new big end rod bearings?

Quote Originally Posted by tjmra View Post
I would have said 'eccentrically' but I neither know how to spell it or know what it means!
Take a look at my avatar and you'll get the picture

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