Oil pump issues
Thread Starter
Instructor
Joined: Jun 2005
Posts: 156
Likes: 0
From: Liverpool NY
Oil pump issues
I recently installed a 400 with a high volume oil pump and have had nothing but problems. oil leaking out of the intake manifold bolts (permatexed and a couple still leak) and oil leaking out of the distributor gasket ( changed gaskets, tightened, etc ). Is there any problem with just going back to a stock pump? I seem to be building way too much pressure in the crankcase. I never had this problem with the 350 with the stock pump.
The engine seems to be fine when I'm taking it easy, but when I get on it the trouble starts and the blue smoke appears from oil falling on the headers....I hate blue smoke!!!!!
Any thoughts on this will be welcome.
Thanks Guys!!!!!
The engine seems to be fine when I'm taking it easy, but when I get on it the trouble starts and the blue smoke appears from oil falling on the headers....I hate blue smoke!!!!!
Any thoughts on this will be welcome.
Thanks Guys!!!!!
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
sounds like you may have a HV /HP pump.?, Ive always used stock m55 mellings pumps in my engines, if they're street driven. I had a dyers 6-71 S/C 350, 68 camaro back in the eighties, and ran a stock pump no problems, on the street of course.
if you're blowing oil out of gaskets and bolts, sounds to me like you have a crankcase pressure problem, pcv valve working? or alot of blowby the rings.
if you're blowing oil out of gaskets and bolts, sounds to me like you have a crankcase pressure problem, pcv valve working? or alot of blowby the rings.
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
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Oil pump won't do any of the things you're talking about. You've either got too much crankcase pressure or not enough venting.
Oil pressure/volume has nothing to do with crankcase pressure.
Time for a leakdown check.
JIM
Oil pressure/volume has nothing to do with crankcase pressure.
Time for a leakdown check.
JIM
Burning Brakes
Joined: Aug 2005
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From: Europe, France
Melting Slicks
Joined: Jul 2000
Posts: 2,631
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From: Hollister and twain harte C.A
I did the same thing on my dad's 80 L-82
the same crap was happing to us !
you'll never get it fixed right
stock oil pump is the only way to go
what you oil pressure?
are pressure was about min70-100 max
the same crap was happing to us !
you'll never get it fixed right
stock oil pump is the only way to go
what you oil pressure?
are pressure was about min70-100 max
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
PCV system as well.[Consider this the obligatory do not use HV/HP pumps in SBCs comment]
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Drifting
Joined: Feb 2005
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From: San diego ca
Drifting
Joined: Feb 2005
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From: San diego ca
Drifting
Joined: Dec 2005
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From: NORTHEAST
Oil pressure and base pressure are 2 issues here and being a 400 block and if it was just bored and honed with out a Torque plate which most local machine shops don't believe in your problem is probably a blowby issue as 400 blocks with he thin decks thin cylinders and the head bolts being extremely close to the cylinder bore will show more distortion then a 350 block will.
It hard to get round rings to seal in cylinder bores .003 distortion or more
Do a leak down test at TDC on each cylinder and if its over 8% you have some ring seal issues.
Make sure your PCV system is complete
Here is a link to look over
http://www.chevytalk.org/threads/sho...page/0#1227305
It hard to get round rings to seal in cylinder bores .003 distortion or more
Do a leak down test at TDC on each cylinder and if its over 8% you have some ring seal issues.
Make sure your PCV system is complete
Here is a link to look over
http://www.chevytalk.org/threads/sho...page/0#1227305
Race Director
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Drifting
Joined: Feb 2005
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From: San diego ca
The OP's question was "Is there any problem with just going back to the stock pump?" The answer is, "No."