New 7.4 with bizarre oil pressure problem
06-06-2017 | 07:13 AM
#11
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From: Central IL
what if you just put a bypass hose in place of the cooler? just a loop out and back in. I think if that showed normal pressure, then there may be an obstruction in the new cooler. just cuz something is new, doesn't mean it is perfect. post 6 in this thread has a good pic with pipe cleaners showing path. http://www.offshoreonly.com/forums/g...ass-valve.html and shows the factory cooler ports. also, if pressure stays at 30 with loop hose imitating cooler, then you know there is an issue in those oil passages at the filter pad. this is a brand new block? worst case scenario, you could screw the filter on down there, and run the cooler to the 2 factory cooler ports.
06-06-2017 | 08:34 AM
#13
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Reversed lines was my first thought too. The y have been checked and rechecked, even against the port side engine which is ok.
Yes if all else fails I will run the filter on the block and the cooler on the factory loop.
Bypass just the cooler to test, good idea.
I also plan this weekend to place a manual gauge in line right where the first connection is at the adapter on the port engine and see what that pump psi is to compare to the pump on the new engine. This way I should have a precooler psi on both pumps. That may tell the story.
Yes if all else fails I will run the filter on the block and the cooler on the factory loop.
Bypass just the cooler to test, good idea.
I also plan this weekend to place a manual gauge in line right where the first connection is at the adapter on the port engine and see what that pump psi is to compare to the pump on the new engine. This way I should have a precooler psi on both pumps. That may tell the story.
06-07-2017 | 06:11 AM
#14
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Joined: Nov 2005
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From: Fredericksburg, Va
with some filters, reversed line you get 0 oil pressure, I think the oil pump is junk, not keeping up with the extra length of lines, cooler etc, or something internally with the engine losing oil pressure
