Testing an IPR?

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Jan 12, 2009 | 10:12 PM

#16

bismic

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Even though you are getting oil flow, you have proven that your LPOP is not developing much pressure at all (bad pump or a leak?). Your IPR may not be working, but I didn't think that a leaking/open IPR would cause the low pressure oil system to not build any appreciable pressure .. At least this is the way it seems to me. Hopefully some experts will jump in on this one.

Jan 12, 2009 | 10:25 PM

#17

Texascadillac42

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New IPR was ordered earlier today, and should be here Wed. If that doesn't do the trick then I will pull the truck inside and really tear into it. I will definitely post my results.

Jan 12, 2009 | 10:32 PM

#18

bismic

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Please do - keep posting what you find. Definitely sorry you are having difficulties.

Jan 14, 2009 | 06:16 PM

#19

Texascadillac42

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Put the new IPR in, and the truck started up after a few cranking cycles. I let it run for 1 min. and shut it off so I could put some of the misc. things I had removed to get the IPR back in. It took a few more crank cycles to get it started again, but it did start. Mechanical oil pressure gauge was reading 25 (which I thought was quite low for the ambient temp and cold motor temp). I walked in the shop to put some tools away, and came back out. The truck had idled up at this point but oil pressure was dropping. I tapped the brake to idle the truck down, checked the gauge again and it said 0. It was still idling fine and sounded good. I shut the truck off and gave up on it for tonight. I guess its time to check the LPO system out unless someone has a better idea?

Jan 14, 2009 | 07:49 PM

#20

brickie

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From: AB/BC

I would replace the low pressure check valve from here if it were mine. That or burn it.LOL

Jan 14, 2009 | 08:00 PM

#21

Texascadillac42

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Haha, I think a CR Cummins would get swapped in before we burn it. When you say low pressure check valve, do you mean the relief valve that is threaded into the bottom of the front cover?