Thanks, Nate.
Oil comes out of the rocker area OK.
How critical an event is it if you hear a bearing knocking? (which he says he
does)
John
________________________________
From: [email protected] [[email protected]] on
behalf of Nate [[email protected]]
Sent: Friday, April 29, 2011 12:43 AM
To: [email protected]
Subject: [old-chevy-truck] Re: Bearings; Oil Pressure ??
That's well within spec.
If you need more pressure (you don't but I digress) , replace the cam bearings
and it'll jump right up .
Many of the new oil pumps are so poorly made , they don't create sufficient
pressure .
FWIW ,these are 1930's tech engines so they run with very low oil pressure but
good volume , that being what engines need most ~ lots of oil where it counts ,
not mass pressure .
To see if it's O.K. , when the engine is idling , remove the oil cap and look
at the weep hole in the middle of the rocker ~ if it's dribbling oil , you're
good to go .
If not , rev. the engine to 1,500 RPM's (not very much) and _hold_ it there for
a few moments , oil should begin to weep out the hole .
The dealer test back in the day was : look at the oil gauge @ idle ~ in a worn
engine it'll typically be on the zero peg but as soon as the engine revs above
idle , it'll go up ~ if it does , you're good to go . many ran for 200,000
miles with only 15 # oil pressure hot , at road speed .
-Nate
John wrote:
>
> hi all
>
> Working on my neighbors 235 that is a circa 1957 block. Had poor oil pressure
> . Put in a new pump which improved things quite a bit. At this point, warmed
> up it is in the 3-20 range in the garage. Not likely to cut it on a hot day
> in July.
>
> Got him to do the rod bearings with Plastigauge. Says he got .0028" . Is that
> large enough to contribute to low pressure? (theory: a lot of tiny leaks =
> one good sized leak). I would have hoped for more like .0015. I assume the
> main bearings are comparable although he has not checked them yet.
>
> Any thoughts appreciated! The block is in a 1946 half ton.
>
> John
>
------------------------------------
Ole Chevy and GMC trucks rule!
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