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Old 11-05-2008, 06:08 PM
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low oil pressure problem, main bearings?

Is it possable to check my main bearing clearence by just dropping the pan or just figure on a weekend engine pull party.

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Old 11-05-2008, 06:11 PM
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You can pull the pan and ck the bearing clearances with plastigauge. Not the best but does work.
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Old 11-05-2008, 06:29 PM
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Oil pressure

Thank You I recently pulled the heads to replace the gaskets.The combustion chambers looked good. The anti-freeze must have cleaned out the carbon. It doesn't smoke. The oil pressure is at 15 at idle but only 25 going down the road. It's a 400 sbc.
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Old 11-05-2008, 06:52 PM
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In the past, I have put a high volume/ hi pressure oil pumps on a tired motor and pick up good oil pressure. My old '51 had 2 lbs hot at idle, changed the pump and it has 30 lbs know.
Dave
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Old 11-05-2008, 06:55 PM
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earl pressure

I think it'll make it through winter than I'll have an engine pull party.
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Old 11-05-2008, 06:57 PM
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I recently experienced a sudden drop in oil pressure on my 427 bbc., it turned out that debris in the oil pump pressure relief valve was holding the valve partially open resulting in a 20 to 30 psi loss in pressure.If you are lucky that may be the problem.Good luck...Ron.
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Old 11-05-2008, 07:08 PM
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Quote:
Originally Posted by rashster
Is it possable to check my main bearing clearence by just dropping the pan or just figure on a weekend engine pull party.
Usually when the bearings are gone, it's the idle oil pressure that disappears not lower cruise pressure that happens. Pressure that falls as RPM comes up is generally indicating:

- That the relief valve has failed and is venting too much oil back to the pan.

- There is a blockage or leak in the pick-up.

- There is a blockage in the main oil galley or filter.

- There is insufficient drain back from the top end.

- The pressure gauge or its sender is lying.

Bogie
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Old 11-05-2008, 07:20 PM
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I agree with Bogie. Connect a direct mechanical gauge to the oil pressure outlet and check it.
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