Question about Ford Excursion

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Why would my oil press. be 3/4 up on guage all the time.cold starting little knoise fo 30 sec.

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Low oil pressure is usually indicative of slightly worn main bearings. Due to the wear it now takes the pump longer to build up pressure which is why you have the knocking noise for so long. You may also hear a knock on accelleration for the same reason.
A far more rare cause is a worn oil pump. Bearings for the most part fail before oilpumps.
You will need to get the bearings fixed soon as possible to prevent further damage to the engine.
The engine needs to come out. You will need to remove the crankshaft and send it to an engineering shop to have it resized. Fit oversize bearings(the engineering shop will give you the size and may even be able to supply the bearings) and you're set. Depending on your budget you may want to change the oil pump as well while the engine is out. You dont need to strip the whole motor. Just get the sump, pulleys and flex plate or clutch + flywheel off.

Posted on Sep 09, 2010

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The weather you live in, oil weight being used, what type of car/truck. I'm thinking run an engine cleaner through for 5 min to clean the engine. What you are hearing is most likely a sticky valve. Drain the oil, change the filter and fill with a light oil in the cold with light loads and heavier oil in hot weather. A multi viscosity oil can be used to weigh out the cold and hot weather.

Posted on Sep 09, 2010

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