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

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.

Re: Oil Presure Problem
 

The pressure is good when it is cold also. The temp is the same as the other motor also.

Re: Oil Presure Problem
 

Try the easy stuff first by switching the oil senders from one to the other.

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. :rolleyes:

Re: Oil Presure Problem
 

Classic signs of engine problem. :mad:

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?