Varying oil pressure - Ford Powerstroke Diesel Forum
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Old 04-13-2013, 04:00 PM
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Varying oil pressure

So I resealed my oil cooler and I have noticed recently my oil pressure gauge keeps moving back and forth. Its normally in between the r and m on the gauge but it keeps changing more and more by moving back and then to its normal position and sometimes it moves around really quickly while I'm driving. The truck runs fine like it always does but I'm new to the 7.3 and I'm not sure if the hpop on its way out or is the gauge just messed up? Thanks guys!

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Old 04-13-2013, 06:43 PM
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The HPOP has nothing to do with lube oil pressure. That "gauge" is really just an idiot light with a needle. The sender is just an on/off switch. When there is "enough" oil pressure, it moves the needle to the middle. So either that sender is goofed up, or you really do have oil pressure that's low, and right on the threshold of tripping the sender. That would be the lube oil pump (aka "LPOP", but really just the "oil pump").
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Old 04-14-2013, 08:03 AM
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What year is the truck? When you resealed the cooler, were all the parts back in the rear header adapter? The earlier trucks had an oil pressure regulating valve on the block side of the adapter that can fall out if you are not careful (later trucks had an adapter that has the regulator valve and also the filter bypass valve held in place with snap rings). Generally the truck will not run without it, but I'm just putting that out there anyway. When resealing, I'm assuming you used just the gaskets and O-rings and did not use any sealants like RTV etc. (which could cause problems if you did). Cheers!
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Old 04-20-2013, 01:38 AM
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Sorry its been awhile my phone broke. Anyway the truck is a 95 and I did not use any rtv or gasket maker or anything when I resealed it. And all the parts that came off the truck went back on. However when I was taking the rear header off there was a small 11mm bolt I accidentally pulled out but I did put it back in, could I have not put it back tight enough if its anything important?

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