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8n oil pressure woes

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Ron1223

07-12-2005 08:07:47




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Had engine rebuilt by shop with good reputation. Got engine back and installed, oil pressure at 40psi until hot, then 0. Pulled pan, oil pump looked like new, crank bearings all scored, assumed the oil pump didnt prime, replaced bearings.

wnt to install pan and saw some gear teeth in bottom. Too long of a bolt used on distributor, took out teeth on crank and camshaft gears. Put in new gears, re assembled, 28psi until hot then 0. Shop has no idea what could be wrong, states that they have used the same guy to grind thier cranks for 20 years and never once had an oversize crank. Any ideas? (also replaced the pin and spring for the pressure relief.

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Rob

07-13-2005 11:52:05




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 Re: 8n oil pressure woes in reply to Ron1223, 07-12-2005 08:07:47  
The long bolt was one mistake, forget that, it"s corrected.
You ran it and it had oil pressure. The bearings were close enough; not so tight the crank won"t turn and not so loose you had no oil pressure. I think you had fine bearings and an assembly lube in the pump and the pump primed and it was running fine. Then something happened and you lost the lube. Then it picked up and ran again with oil pressure. Then you lost oil pressure.
I"d tap on the end of the oil pick up tube and expect to it to say "thunk." I"d want it to "sing" but I"m betting it won"t. I think that tube is cracked, broken or the brazing is bad, something so the pump doesn"t pick up any more oil. A messed up tube likely goes "thunk" and a good solid tube "sings" when you ring it. That tube gets warmed and opens up somehow. Might be the joint with the pump body.
You can plastigage scored bearings but you might have problems reading it. It will be jagged and not consistent. Whatever bearings you put on that crank, or any crank, ever, you use plastigage before final assembly. Remember that. I"m betting you get the same size bearings the machine shop gove you and they will be right.
Figure out why it will pump oil only until it gets to operating temperature and fix it before you run it again.

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Ramrod

07-12-2005 11:31:25




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 Re: 8n oil pressure woes in reply to Ron1223, 07-12-2005 08:07:47  
Dan is right, I suspect wrong bearings is second problem, wrong distributor bolts original problem. Plastigage the mains, look for .002 clearance max.

Ramrod



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souNdguy

07-12-2005 08:17:04




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 Re: 8n oil pressure woes in reply to Ron1223, 07-12-2005 08:07:47  
Camshaft runs bare in the block...

Soundguy



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ron12234

07-12-2005 08:31:57




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 Re: 8n oil pressure woes in reply to souNdguy, 07-12-2005 08:17:04  
not sure how that applies, should i be looking somewhere else for the problem?
thanks



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souNdguy

07-12-2005 11:21:16




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 Re: 8n oil pressure woes in reply to ron12234, 07-12-2005 08:31:57  
You mention that you have oil pressure problems, had the engine rebuilt.. found scored bearings.. and claim to not know how the camsaft running in the bare block applies to oil pressure?

I think you need to go back to the mechanic....

Soundguy



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ron1223

07-12-2005 16:51:23




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 Re: 8n oil pressure woes in reply to souNdguy, 07-12-2005 11:21:16  
Nope, dont know, your way smarter than me, did what i said i did, also said i asked the mechanic already, will try the plastigauge, can i use the scored bearings to check the gap, (directed to anyone with an interest in actually answering the question)



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souNdguy

07-12-2005 19:52:33




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 Re: 8n oil pressure woes in reply to ron1223, 07-12-2005 16:51:23  
I was about to answer both parts of the question till I hit that last line.

Since the advice is free and all.. and you are the one with the bad engine and bad attitude.. i think I'll take my free advice and walk on to the next message.

My only other advice is for you to get a shop service manual and read it over and think about why/how an engine develops oil pressure. Once you figure that out.. you will be good to go.

Soundguy

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ron1223

07-13-2005 08:45:56




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 Re: 8n oil pressure woes in reply to souNdguy, 07-12-2005 19:52:33  
I may have read your message wrong, Ron



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Dan

07-12-2005 08:13:14




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 Re: 8n oil pressure woes in reply to Ron1223, 07-12-2005 08:07:47  
Plastiguage those main bearings. Let us know the results.

Dan



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