Low oil pressure - Team Camaro Tech
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post #1 of 10 (permalink) Old Apr 6th, 01, 09:47 AM Thread Starter
 
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Question

I have a Chevy 350 in my boat. It has new heads, oil pump, all check values, and new pan. At idle it is fine. Under load oil pressure drops to 10-20 lbs. This was checked with a manual gage. What could be cuasing this?
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post #2 of 10 (permalink) Old Apr 6th, 01, 09:56 AM
 
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Are you sure the pickup didn't come off?

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post #3 of 10 (permalink) Old Apr 6th, 01, 10:02 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Tracy Focht:
Are you sure the pickup didn't come off?

<HR></BLOCKQUOTE>the pick up is fine

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post #4 of 10 (permalink) Old Apr 6th, 01, 10:03 AM
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Does it have one of those screwball giant boat pans? They can cause all kinds of problems under load because the oil runs away from the pickup.

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post #5 of 10 (permalink) Old Apr 6th, 01, 10:13 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by oger:
Does it have one of those screwball giant boat pans? They can cause all kinds of problems under load because the oil runs away from the pickup.

<HR></BLOCKQUOTE>
It has a stock pan. Thanks for your thoughts.

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post #6 of 10 (permalink) Old Apr 6th, 01, 03:17 PM
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Mike,
Why did you replace the oil pump ???? If you did it for low oil pressure you probably wasted your money as oil pumps very rarely are the cause. If the motor has more than a few hundred hours on it and has oil pressure problems, it probably has bearing problems. Marine applications are murder on a motor, especially if it is not maintained. It is like getting in your car with the trunk full and 4 passengers, finding a fairly steep hill to drive up at full throttle, and pretend the hill never ends ! That is how I explain it to customers. Have a mchine shop cut open the oil filter and look for bearing material.
If you have new heads, that tells me the old ones either rotted through, or the exhaust manifolds did...getting water in the motor. Either that or they cracked. You will probably have to end up pulling the motor and properly fixing the problem

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post #7 of 10 (permalink) Old Apr 7th, 01, 04:13 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by BillK:
Mike,
Why did you replace the oil pump ???? If you did it for low oil pressure you probably wasted your money as oil pumps very rarely are the cause. If the motor has more than a few hundred hours on it and has oil pressure problems, it probably has bearing problems. Marine applications are murder on a motor, especially if it is not maintained. It is like getting in your car with the trunk full and 4 passengers, finding a fairly steep hill to drive up at full throttle, and pretend the hill never ends ! That is how I explain it to customers. Have a mchine shop cut open the oil filter and look for bearing material.
If you have new heads, that tells me the old ones either rotted through, or the exhaust manifolds did...getting water in the motor. Either that or they cracked. You will probably have to end up pulling the motor and properly fixing the problem

<HR></BLOCKQUOTE>This motor was new in 98, and has very low hours on it, I'd say 50 tops. A valve got stuck after the winter causing the head problems, there is no bearing problems present, the oil pump was replace because we thought it would fix the low pressure problem, your right, it was a waste of money because the problme is still there. The motor runs great, just low pressure under load. Do you think it could be a bad distributor, a used one was installed just before this problem started.

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post #8 of 10 (permalink) Old Apr 7th, 01, 07:43 AM
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mike e,

Please don't take this wrong. If you would have stated everything you knew was checked out already it would have saved 4 people from spending time giving you answers you didn't need.
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post #9 of 10 (permalink) Old Apr 7th, 01, 01:57 PM
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Check the plastic connector between the oil pump and the distributor! Go to a brass one.
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post #10 of 10 (permalink) Old Apr 8th, 01, 04:23 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by 1st & 2nd GENGuy:
Check the plastic connector between the oil pump and the distributor! Go to a brass one.<HR></BLOCKQUOTE>

Thanks, will do!
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