1985 Chevy Camaro Oil spits out the filter

CHRISMO

MEMBER
1985 CHEVROLET CAMARO
V8
2WD
AUTOMATIC
150,000 MILES

Hi,

I just rebuilt the 350 in my Camaro and dropped it back in. If I crank it over with the ignition unplugged, the oil pressure is normal but if I start the engine, ALL of the oil starts spewing out around the base of the oil filter. I've tried changing filters, tightening the filter, I double checked that the pressure relief valve was functioning.

What could be the problem?

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Hi ChrisMo, Welcome to 2carpros and TY for the donation

Could be the oil pressure relief valve is not opening, blocked main oil gallery, and tight engine bearings

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Friday, August 20th, 2010 AT 8:09 PM

CHRISMO

MEMBER
3 POSTS

Hi,

Checked oil pressure relief valve already: WORKING OK
Already removed tranny and rear gallery plugs and cleaned out galleries with a brush (and the block had been hot tanked before assembly): GALLERIES OK
Crank bearings have between 0.0015 and 0.002 clearance which is more on the big size according to spec sheet so: BEARINGS OK.

If you have any other suggestions please let me know and thank you for your reply.

P.S. Cam & lifters are also new (Edelbrock 2102) and the cam rotated freely even dry so cam bearings are OK too

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Friday, August 20th, 2010 AT 11:03 PM

RASMATAZ

MECHANIC
75,992 POSTS

In conclusion I will replace the oil pump. The oil pump regulating valve is set by the manufacturer If the oil pressure regulating valve becomes stuck in the closed position or slow to move to the open position after the engine has started, the pressure in the system will exceed the regulating valve setting. We cannot blame a wrong type oil vicosity-clearances and oil galleries are good-there's nothing else I can think off-is the oil pump

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Saturday, August 21st, 2010 AT 11:55 PM

CHRISMO

MEMBER
3 POSTS

Hi,

I'm coming to the same conclusion. I've already checked everything else! Plus that, the pump itself is a new unit and I'm wondering if they didn't give me a high volume pump instead of the stock one. The machine work on the bloc has brought everything back to stock clearances so a 25% volume increase in oil flow from a high volume pump might just be too much oil.

I'll take the pan off and put in a stock pump (well, at least check if the impellers of the new pump are longer than a stocker)

Thanks for your help!

Chris

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Sunday, August 22nd, 2010 AT 3:10 PM