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rh8807
 Post subject: 76 Engine Knocking
PostPosted: Wed Mar 21, 2007 9:32 pm 
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Location: Port Angeles, WA
Ok, this one is stumping me, 76 Chevy Luv, Seems to be knocking near rear of engine.

number 4 connecting rod bearing was almost completly worn out, seems to have worn the crank a bit, had to replace bearing with a 25mm oversize (1 size over standard).

Still knocking, visually inspected the block, pistons and connecting rods while I had the oil pan off, no visable damage.

Its definately a mechanical sound, gets faster with increased RPM.

Any Idea, is there something simple I missed, or are you thinking bent crank, would the oil pump or oil pump drive gear make that much noise.

It is auto trans, someone sugested flex plate, that seems fine.

What next?

Any ideas are welcome.

Thanks
Rick
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erronisme
 Post subject:
PostPosted: Wed Mar 21, 2007 10:14 pm 
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sorry not much help... maybe check the wrist pins?

8O
I used to live up on hurrican ridge.... i thought it was funny to see some one from P.A.
One of the best places to live, but not very many jobs up there.

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mytmouz
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PostPosted: Wed Mar 21, 2007 10:19 pm 
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Did you have the crank machined, or just replace the bearing?

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ctmandu
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PostPosted: Wed Mar 21, 2007 10:20 pm 
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check for bent or stuck valve maybe

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rh8807
 Post subject:
PostPosted: Wed Mar 21, 2007 10:24 pm 
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mytmouz wrote:
Did you have the crank machined, or just replace the bearing?


I just replaced the bearing with an oversized. Probably should of had it machined. I have a friend helping me, who has a friend thats a mechanic...etc...its kinda one of those deals..LOL Would be nice to replace the right part for once instead of guessing. :-)
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rh8807
 Post subject:
PostPosted: Wed Mar 21, 2007 10:26 pm 
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Location: Port Angeles, WA
Quote:
I used to live up on hurrican ridge.... i thought it was funny to see some one from P.A.
One of the best places to live, but not very many jobs up there.


NO, there isnt many jobs in Port Angeles, worked at Walmart for a while, went back to driving truck over the road...it beats the heck out of retail. LOL
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mytmouz
 Post subject:
PostPosted: Wed Mar 21, 2007 10:40 pm 
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You probably are going to have to remove the crank and have it maqchined. I'm pretty sure if you check the new bearing, it's gonna be bad now. Sorry. :cry:

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rh8807
 Post subject:
PostPosted: Thu Mar 22, 2007 8:05 am 
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Thanks for all the replies...I appreciate it.

I will get it going eventually...not ready to give up, other then that knock the engine sounds strong. so its just a matter of figuring out the cause.

Thanks for the ideas, I will let you know what I find out. :-)
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