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need confirmation of the location of the anti drainback valve

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Old 06-19-2017, 04:27 PM
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need confirmation of the location of the anti drainback valve

I am amazed that there is very little about this, symptoms cold starts getting longer, oil pressure on gauge in sync with the long starts.
Ive found some discussion but it degenerates to problems with hpop and hoses. this problem is a low pressure problem and yes the hpop reservoir is draining back. even before id heard of the "anti drainback valve" I KNEW THERE WOULD BE A CHECK VALVE IN THE SYSTEM SOMEWHERE. So, can anyone confirm that the antidrainback valve is in the oil filter housing and give me a part number? theyre easy to find for the 6.0 but not so much for the 7.3. you have my appreciation!
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Old 06-19-2017, 04:35 PM
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some info and pics in the following thread. mostly on page 2
https://www.ford-trucks.com/forums/1...ir-plug-2.html
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Old 06-19-2017, 04:48 PM
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Old 06-19-2017, 04:53 PM
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Old 06-19-2017, 04:53 PM
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thanks, it makes sense that the upper check valve could cause leaking and its the easiest to fix. This doesnt appear to be that common a problem but i will post my results.
Thanks again
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Old 06-19-2017, 05:09 PM
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The way I understand it that is not really a drain check valve but more of a pressure relief for the oil cooler. If there were a piece of dirt under the ball I guess it could drain the hpop res down but only as far as the standpipe. Not sure how far that is, will need someone with more knowledge of the hpop to come along.

Have you ever changed or cleaned the IPR?
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Old 06-19-2017, 05:17 PM
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Old 06-19-2017, 05:43 PM
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well i'll be! thanks allaboutmpg, this is something i will be looking for.
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Old 06-19-2017, 08:16 PM
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It's still almost never the check valve. Keep an open mind and good luck in your search.
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Old 06-19-2017, 08:32 PM
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Bad upper injector o-rings can also cause the reservoir to drain.
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Old 06-22-2017, 02:26 PM
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as is always the case, where would the oil go if orings were bad and how could you test?in the case of upper orings the oil would go right back into the crankcase wouldnt it?

Last edited by dp1181; 06-22-2017 at 02:27 PM. Reason: complete the thought
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Old 06-23-2017, 03:53 PM
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Yes, bad upper o-rings would let the oil simply drain back into the crankcase. You can pull the valve covers and look for leaks with the engine running, or you can pressurize the oil gallery in each head with compressed air and listen for the leak once the oil has been forced out.
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