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Old December 7th, 2010, 08:11 PM   #1
deerebowtie
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Old December 7th, 2010, 08:18 PM   #2
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DId you plasti-guage the bottom end as you reassymbled to see what the clearances between the crank & rods vs their respective bearings was? And when i say reassymbled i mean turn the crank, replace bearings rod and main? I did a similar rebuild on a dodge with the motor in the truck, It will only buy the engine a little time. Oh yeah by the way, cam bearings wear out too and create more clearance for oil pressure to leak out through.
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Old December 7th, 2010, 08:39 PM   #3
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I gotcha. Well, thats exactly how my dodge was too. Temp fix. Which is funny because that was 2 trucks ago, and i still see my old truck out driving around. I guess if the possibility of unknown failure date is a supprise this trucks owner can live with, just run it and see how long it lives, if the long block is the future. Mine had pressure when it was off idle, but like you said was no pressure on idle.
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Old December 8th, 2010, 06:25 AM   #4
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Is this PSI on the crappy factory guage in the dash or do you have an aftermarket guage? If factory, the sending unit might be on the way out.
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Old December 8th, 2010, 07:16 AM   #5
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If you plasticgauged the bottom end and were happy how the clearances were you really have 2 options. Run it how it is or spend more money. My first thing I would do though would be to run 20w50 and some lucas oil stabalizer and see if thicker oil does anything, and like chvypwr said make sure your getting a good reading first. On my toyota it would go to nothing on the stock gauge but was really over 20 psi at idle after i tested a real mechanical guage.
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Old December 15th, 2010, 09:53 PM   #6
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i would say you gotta motor issue. either you gotta get the crank ground and re do bearings again or take it somewhere. how bad was it when you first pulled it apart? did you spin a bearing or just wore out motor? if you spun a bearing then you gotta do something with the crank and either the rod if it spun a rod bearing or the main journal if it spun a main bearing. hopefully not to bad but good luck
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Old December 15th, 2010, 10:46 PM   #7
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You again, huh?

Were you ever going to reply to that "other" thread?
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Old December 15th, 2010, 11:02 PM   #8
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plastiguage is your first problem, your second problem is if you didn't replace the cam bearings those are probably junk, third how did the crank look? any grooves? if you would like the engine rebuilt right bring it to me i'll have that engine just as good as a reman unit for half the cost. pm me if interested
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Old December 16th, 2010, 08:12 AM   #9
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highly inaccurate. i've seen inaccuracies as far as .05". a inside and outside micrometer is the only way to accurately measure bearing clearances. i've rebuilt plenty of engines some having spun bearings, or no bearings left. with proper machining, and checking clearances with the proper tools, i have not had one engine fail after rebuilding it. 2 of them are my own still running perfectly in my S-10 and my camaro. both have 50 psi hot idle oil pressure even with 15K on them now. and trust me i'm not nice to either of them.
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Old December 16th, 2010, 08:27 AM   #10
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.
Quote:
Originally Posted by dougstephvoor View Post
chevy V8's are famous for running with no oil pressure, my brother had one that ran for years with no oil pressure.
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Old December 16th, 2010, 11:54 AM   #11
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also, buy a good filter, don't buy a fram, the cage that holds the filter element in those is plastic and have been know to get brittle and break.
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Old December 16th, 2010, 09:42 PM   #12
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i agree with kodiak. we had a guy at our shop that we did all the machine work on his engine and he went to put it together with plasitgauge and called tellin us that the rods and mains only had about .0005-.001 oil clearance. and he checked it like 5 different times so we convinced him to bring it in and we checked it with bore gauges and mics and he had about .0025-.003. not WAY off but far enough off that if he would have relied on the plasitgauge and modded his bearings then it would have had way to much.
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Old December 19th, 2010, 03:34 PM   #13
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just an FYI, plastic gauge is a limited shelf life product. its only good for about 2 months and it starts shrinking and getting brittle. if you do use it make sure its as fresh as you can get.

on the oil pressure issue. it will end up being a cam bearing. most likely the very rear one. I have seen plenty done wrong over the years and they get cocked or to far rear of center and then they dump after they warm up.
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