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Oil Presure Problem

Old 06-12-2006, 04:50 PM
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Default Oil Presure Problem

I am having problem with my oil pressure dropping. I lost a motor about 3 months ago. I rebuilt the motor and put it back in the boat. I ran it for about a month and when i would power down from about a 15 min. run. My oil pressure would drop to about 10 lbs. I could crank the motor back and the pressure would still be low. If i powered back up the pressure would return to 50lbs. I changed the oil filter and that seamed to fix the problem. I figured that i might still have some trash in the oil cooler that i couldnt get out. This weekend the same thing happened. I changed the filter but it is still low pressure when i am idling. Can anyone give me some insight on my problem......Thanks
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Old 06-12-2006, 04:59 PM
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Default Re: Oil Presure Problem

Does the pressure go back up on cold start? Does the oil cooler warm up when the engine is warm? Sounds like hot oil may be a problem.
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Old 06-12-2006, 05:01 PM
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Default Re: Oil Presure Problem

The pressure is good when it is cold also. The temp is the same as the other motor also.
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Old 06-13-2006, 03:20 AM
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Default Re: Oil Presure Problem

Try the easy stuff first by switching the oil senders from one to the other.
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Old 06-13-2006, 07:56 AM
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Default Re: Oil Presure Problem

I had a similar problem years back with a big block Ford. After pulling most of my hair out , I found my "reconditioned" rods weren't recond properly. Top to bottom across the bearing was fine , but go side to side and I had .005 to .006 clearance. As soon as it got up to operating temp , I had 5 lbs at idle. Running still gave me 45 or so. Redid the rods and 70 lbs cold , 60 hot , 45 idle.
I'm sure this is NOT what you want to hear.
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Old 06-13-2006, 10:43 AM
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Default Re: Oil Presure Problem

Classic signs of engine problem.
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Old 06-13-2006, 11:17 AM
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Default Re: Oil Presure Problem

Could be the wrong spring in the oil pump giving you low pressure at idle once the motors is hot.

What weight oil do you run?
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