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  #1 (permalink)  
Old 06-11-2005, 02:56 AM
1991 H.O. 5.0L Thunderbird
 
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high oil pressure HELP PLEASE!

Hi, i'm new here and i hope that i can get some help, i have been battleing this for almost a year with my car. i have a 1991 Ford Thunderbird with the H.O. 5.0L 302 in it, i had to do a rebuild a while ago because of a blown rear main seal, when i did the rebuild i replace the front and rear main seals, main bearings, rod bearings, heads, oil pump, oil pan, oil sending unit and, gaskets all around, i started the car up and it ran like a dream for about a month then one day i started it up and the oil pressure was maxed out, i mean off the guage maxed out, now i know that with oil pressure that high i would have blown every seal out in the engine, but i have no oil leaks what so ever, the engine does now use that much oil, i'm thinking it's an electrical problem, i replaced the oil sending unit one more time and it still has the high oil pressure, i even replaced the oil guage thinking it was a faulty guage, still nothing, i'm and my wits end here, i'm pretty knowledgeable when it comes to engines, but this one has me stumped, the only other alternative i can think of is pulling the engine again and replacing the oil pump, but if there is something that you guys could suggest i would greatly appreciate it, if i can get away with out havin to pull the eninge i will be very happy, seeing as the engine compartment is very cramped with the small block 302 in there.

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Old 06-11-2005, 03:42 AM
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oil pressure

Put a mechanical gauge on it and then you will know the true oil pressure.
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Old 06-11-2005, 07:42 AM
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Check the resistence in your wire running to the gauge and look for an open circuit.The best way to find out for sure is put the mechanical gauge in like FEDDO just stated.At the least just hook one up under hood and check it at an idle to see if it is truly high oil pressure.
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Old 06-11-2005, 07:56 AM
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yes..i would most def go with a mechinal gauge//i hate electric gagues ...and then take it from there
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Old 06-12-2005, 02:32 AM
1991 H.O. 5.0L Thunderbird
 
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ok, thank you for your advice
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Old 06-12-2005, 08:15 AM
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I agree, sounds more like an electrical problem (short to ground in the sending wire) than a pressure problem. Look for a place where you may have pinched ir otherwise damaged the wire during your rebuilt.

And super high pressure will not result in blowing any seals. The only seal I can think of that is exposed to oil pressure is the one on the oil filter canister and that is captured by a steel lip so it would take a BUNCH of pressure to ever blow it out. The rest of the oil pressure system is captured in drilled passages within the engine parts and they can take anything your pump can put out. All the other external seals on your engine are splash seals - just holding back zero-pressure oil begin thrown around the inside of the engine.

The real harm that comes from too-high oil pressure is hidden and takes a relatively long time to surface. There is no symptom you can detect except a pressure gauge reading (if the gauge is working which yours appears not to be). Worn pump drive gears on the cam and pump shaft, worn pump shaft tangs, and excessive power consumption are the bad actors which are difficult to diagnose until it is too late!
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Old 03-25-2009, 05:38 PM
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oil pressure

fi you tack your oil filter off and look under it you will see 2 bolts take them out and check the oil by pass valve if it is stuck it will cause hi pressure and some times the oil filter will explode rogerhad40150@yahoo.com
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Old 03-25-2009, 05:42 PM
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i didnt relize this thread was 4 yrs old.
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Old 03-25-2009, 06:44 PM
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oil pressure

4 yrs ok did you get your pressure fixt hope so
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