bad intermittent oil leak
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Joined: May 2002
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From: loxahatchee fla
bad intermittent oil leak
my neighbor came over with his new 502/1967 chevelle
(this applies to BOTH BIG AND SMALL BLOCK V/8s and camaros and corvettes too!) he said the engine leaks oil badly when he accelerates hard yet hes replaced the oil pan gasket and no change, and altho the frames soaked the damn engine won,t leak at all while idleing on a lift to find the leak!
EXPERIANCE COUNTS :grin: I knew the answer :grin:
before you go pulling the oil pan theres something you should know.
on some blocks in fact most blocks theres 4 bolt holes normally used for early marine style front plate motor mounts that bolt to the front of the block, theres two holes on each side, one above the other spaced about 3" apart vertically, on some blocks these holes are blind and can,t leak,but on others one or more are drilled into an area where oil will leak out ,(especially at above 2000rpm)if a 1/2 long 3/8 NC thread bolts not coated with loctite and seated. you sure would not be the first guy thats told me hes replaced the oil pan gasket yet the car still leaks oil under higher rpms but at idle there seems to be no leak?
(this applies to BOTH BIG AND SMALL BLOCK V/8s and camaros and corvettes too!) he said the engine leaks oil badly when he accelerates hard yet hes replaced the oil pan gasket and no change, and altho the frames soaked the damn engine won,t leak at all while idleing on a lift to find the leak!
EXPERIANCE COUNTS :grin: I knew the answer :grin:
before you go pulling the oil pan theres something you should know.
on some blocks in fact most blocks theres 4 bolt holes normally used for early marine style front plate motor mounts that bolt to the front of the block, theres two holes on each side, one above the other spaced about 3" apart vertically, on some blocks these holes are blind and can,t leak,but on others one or more are drilled into an area where oil will leak out ,(especially at above 2000rpm)if a 1/2 long 3/8 NC thread bolts not coated with loctite and seated. you sure would not be the first guy thats told me hes replaced the oil pan gasket yet the car still leaks oil under higher rpms but at idle there seems to be no leak?
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Joined: Jul 1999
Posts: 18,457
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Yeah I've posted that for people with new-motor mystery oil spew, or "I yanked my smog pump and now I'm driving the Exxon Valdez" so many times, it ought to be a sticky.
The top hole on the pass side is the only one that does it. That one goes right straight into the fuel pump rod passage. In fact, when changing the fuel pump on a carb car, you can put a long bot in that hole FINGER TIGHT to hold the rod in place to allow you to put the pump in without the rod slipping down.
The top hole on the pass side is the only one that does it. That one goes right straight into the fuel pump rod passage. In fact, when changing the fuel pump on a carb car, you can put a long bot in that hole FINGER TIGHT to hold the rod in place to allow you to put the pump in without the rod slipping down.
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