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Old 12-07-2013, 12:59 PM
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oil pressure

What would cause a small block Chevy to lose oil pressure with a high volume oil pump.

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Old 12-07-2013, 01:02 PM
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Lets see...Now where did I put my list ?
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Old 12-07-2013, 01:47 PM
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The oil isn't getting to the top half of the motor. Any ideas what it would be?
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Old 12-07-2013, 01:57 PM
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I got no oil at the top at low rpm's.
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Old 12-07-2013, 02:22 PM
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Distributor housing sometime will not seal properly. It will loose oil pressure. Replace the distributor. It happen to me twice.

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Old 12-07-2013, 02:46 PM
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No its sealed. Called jegs and said the machine shop installed cambearings wrong they are supposed to be facing up and their facing down.
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Old 12-07-2013, 03:46 PM
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Quote:
Originally Posted by Randy1998 View Post
No its sealed. Called jegs and said the machine shop installed cambearings wrong they are supposed to be facing up and their facing down.
((What would cause a small block Chevy to lose oil pressure with a high volume oil pump.)) Next time you might want to mention, you just installed, and started the motor you got after is was supposedly machined and done, and ready to go, and had no oil pressure. That might give a better clue...
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Old 12-07-2013, 03:59 PM
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We got the machine work done like 4 years ago. But didn't really drive the truck that.much. now its an everyday driver and I guess it started to show it.
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Old 12-07-2013, 05:14 PM
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We got the machine work done like 4 years ago. But didn't really drive the truck that.much. now its an everyday driver and I guess it started to show it.
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No its sealed. Called jegs and said the machine shop installed cambearings wrong they are supposed to be facing up and their facing down.
I don't understand, you called Jeg's and who said the cam bearings were upside down, you or Jegs?

So, you pulled the motor today, removed the cam to see the bearings? Otherwise how would you know how they were installed after four years?

We assume you haven't corrected it, and the problem is fixed, let us know. how it goes.
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Old 12-07-2013, 08:13 PM
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In the many years of doing small block chevies. I have seen cam bearings installed with the oil holes just about everywhere in the circle, it has never caused low oil pressure.. The oil feeds thru an annular groove behind the bearing. The cause of low oil pressure/cam bearings is the clearance between the cam and bearings. The factory engine designers decided their original positions were optimal for oiling. But not for oil pressure. As long as the bearings are fed oil. They will work on a street type engine..

Usually a great loss of pressure like you are experiencing is large main/rod bearing clearance or a front oil system plug (behind timing gear) has blown out or rear cam bearing is leaking from incorrect install. Or pressure relief spring in pump is broken/defective or even a bad oil filter.. Massive leak internally. I have even seen the lifter popped out of its bore and the engine still had fair, but low, oil pressure.
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