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post #1 of 5 Old 03-15-2011, 9:25 AM Thread Starter
 
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954 rebuilt

Ok here's the up date on the rebuild. brought the standard bore weisco piston. everything is in now, my mechanic is telling me there's a problem.
He's telling me that when cylinder 2 rod is tighten the crank won't turn, and when the rod screw is loosen the crank turns. So he's telling me that it's either the rod or the crank. he also showed me the old bearing for that rod and it had a grove in it. the mechanic said that the crank journal is either bad or the rod is bad. Could it be that the bearing isn't the right one. Nether the less i have a perfect 929 engine with less than 7,000 mile that i crack the case and i took apart, i'm actually am using the head and transmission fron the 929.
WHAT COULD KEEP THE CRANK FROM TURNING AND WHAT WOULD CAUSE A GROVE IN THE BEARING?
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post #2 of 5 Old 03-15-2011, 9:36 AM
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Re: 954 rebuilt

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Originally Posted by spaceghost View Post
Ok here's the up date on the rebuild. brought the standard bore weisco piston. everything is in now, my mechanic is telling me there's a problem.
He's telling me that when cylinder 2 rod is tighten the crank won't turn, and when the rod screw is loosen the crank turns. So he's telling me that it's either the rod or the crank. he also showed me the old bearing for that rod and it had a grove in it. the mechanic said that the crank journal is either bad or the rod is bad. Could it be that the bearing isn't the right one. Nether the less i have a perfect 929 engine with less than 7,000 mile that i crack the case and i took apart, i'm actually am using the head and transmission fron the 929.
WHAT COULD KEEP THE CRANK FROM TURNING AND WHAT WOULD CAUSE A GROVE IN THE BEARING?

Is it the original crank and rod?
Plastigauge the bearings which he should have done anyway. The bearings are ordered from the codes stamped on the crank, cases and rods.
The rod may also be oval which would be pinching the crank.
Is the engine being rebuilt because of a failure?

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post #3 of 5 Old 03-16-2011, 12:01 AM Thread Starter
 
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Re: 954 rebuilt

to be honest BladeRacer i couldn't even tell u i brought a 954 engine from some one after cracking my 929 engine and come to find out the 954 engine i brought was crack and badly weld ( i didn't see the weld). well anyway the 954 engine is being rebuild because the weld was leaking. after taking the engine apart the mechanic realized that who-ever put the engine back together didn't do it right. Blade i figure worst comes to worst i'll use the crank and rods from my 929.
I'm waiting to hear from the mechanic.
Blade i know that the 954 crank and rods are lighter than the 929, but would it make a difference if i use the 929 crank and rod, or could i use the 929 crank with 954 rods or could i use 929 rods with a 954 crank. botton line the problem exist with in the crank, rods, bearing or the mechanic.......
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post #4 of 5 Old 03-16-2011, 9:09 AM
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Re: 954 rebuilt

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Originally Posted by spaceghost View Post
to be honest BladeRacer i couldn't even tell u i brought a 954 engine from some one after cracking my 929 engine and come to find out the 954 engine i brought was crack and badly weld ( i didn't see the weld). well anyway the 954 engine is being rebuild because the weld was leaking. after taking the engine apart the mechanic realized that who-ever put the engine back together didn't do it right. Blade i figure worst comes to worst i'll use the crank and rods from my 929.
I'm waiting to hear from the mechanic.
Blade i know that the 954 crank and rods are lighter than the 929, but would it make a difference if i use the 929 crank and rod, or could i use the 929 crank with 954 rods or could i use 929 rods with a 954 crank. botton line the problem exist with in the crank, rods, bearing or the mechanic.......

If you are mixing and matching components from different engines, measuring all the clearances is critical. Although the codes are stamped on the cases, crank and rods you don't know if any of the journals have been damaged or machined. Plastigauge is the only sure way to know the oil clearances are correct. It's especially important if you mismatch the upper and lower cases as you may require different size bearings in each case for the same journal.

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post #5 of 5 Old 03-16-2011, 9:33 AM
 
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Re: 954 rebuilt



If you are this deep into it you need to get it right. Pulling all apart again aint going to be nice.

I would not mix the engine parts.

Study the old parts are does it look damaged (scored) or does it look clean and nicly formed? buy new bigend bearings after checking out the partnumbers and diamension details from the shop drawings. you need to understand why it doesnt fit!
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