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post #1 of 25 (permalink) Old 03-20-2009, 02:42 AM Thread Starter
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hp oil issues

Ive been having troubles with hpo droping as the truck gets warm. Tried every possible thing I can think of and finally got a scanner to put on it.

With key on ipr duty cycle is 15%. Cranking it goes up to 50%. Is this normal?

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01 Ex. Cab Long Bed Dually 4x4 6 Speed. Intake, Exhaust, Super Chips Tuned
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post #2 of 25 (permalink) Old 03-20-2009, 03:16 AM
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Re: hp oil issues

Sounds about right. IPR can go as high as 85% during cranking. Barney

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post #3 of 25 (permalink) Old 03-20-2009, 03:26 AM Thread Starter
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Re: hp oil issues

Alright then. Any ideas on why it will only build 3-400psi while cranking. Cranking speed is ok.

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post #4 of 25 (permalink) Old 03-20-2009, 03:52 AM
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Re: hp oil issues

Isolate it on the oil side so that you are only trying to start on one head and see if that effects it would be one idea. You can also isolate the pump from the heads to do some testing as well.

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post #5 of 25 (permalink) Old 03-20-2009, 03:56 AM Thread Starter
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Re: hp oil issues

Done all that. Pumps make 3000+ instantly when cranked and not hooked up to the ipr block. As soon as the pumps are hooked back up to the block pressure is once again gone. Ive swapped 3 different ipr's with new o rings, and one ipr was brand new. Also tried a different ipr block.

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01 Ex. Cab Long Bed Dually 4x4 6 Speed. Intake, Exhaust, Super Chips Tuned
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post #6 of 25 (permalink) Old 03-20-2009, 04:02 AM
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Re: hp oil issues

Since you say pumps have you tried this was just a single pump. Can you borrow a known good pump and IPR perhaps. I am not familar enough with the terminator set up I assume you have to really be that helpful.
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post #7 of 25 (permalink) Old 03-20-2009, 04:30 AM
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Re: hp oil issues

I had trouble with mine building pressure recently. It would slowly build pressure while cranking and then start but once the oil got warm enough it would die and it wouldn't restart until it was completely cold again. This problem started out as extended cranking to get it to start and it got progressively worse until it would completely die. Turned out to be the top injector o-rings were blown through.




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post #8 of 25 (permalink) Old 03-20-2009, 10:57 AM Thread Starter
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Re: hp oil issues

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Originally Posted by Tom S View Post
Since you say pumps have you tried this was just a single pump. Can you borrow a known good pump and IPR perhaps. I am not familar enough with the terminator set up I assume you have to really be that helpful.
Pumps should be fine along with the ipr. It ran when I tore it down and they were boxed up sitting on the shelf untill now and one ipr was brand new.

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01 Ex. Cab Long Bed Dually 4x4 6 Speed. Intake, Exhaust, Super Chips Tuned
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post #9 of 25 (permalink) Old 03-20-2009, 10:58 AM Thread Starter
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Re: hp oil issues

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Originally Posted by Colorado View Post
I had trouble with mine building pressure recently. It would slowly build pressure while cranking and then start but once the oil got warm enough it would die and it wouldn't restart until it was completely cold again. This problem started out as extended cranking to get it to start and it got progressively worse until it would completely die. Turned out to be the top injector o-rings were blown through.




Dave
Already put new o rings on the injectors. Made no difference. I also unhoked the line going to the ipr block and plugged it. Ran the normal line to the head, and put the gauge on that particular head. Cranked it up and instantly 3500psi.

95 Ex. Cab Long Bed 4x4. Built.

01 Ex. Cab Long Bed Dually 4x4 6 Speed. Intake, Exhaust, Super Chips Tuned
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post #10 of 25 (permalink) Old 03-20-2009, 03:21 PM
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Re: hp oil issues

Well you can also make a tester to pressure test the heads to make sure you are not bleeding off your HP oil faster then the pumps with warm oil can supply it. It is basically just a clean lever grease gun filled with oil and a hose and gauge to connect if to the heads. You test one head at a time with it. If both heads hold pressure then you know the heads, o-rings, poppets, etc are not a part of the problem. That puts the problem back closer to the pump and ipr. Bob Rilley has a test stand to test HP oil pumps so that might also be an option for you in testing your pump(s).

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