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Technical Info: 1st Generation Technical discussion of first generation (1989 - 1993) questions, solutions and upgrades. All 1st generation topics are suitable for this forum.
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Old 05-05-2017
meatloaf meatloaf is offline
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Default No Oil Pressure After Rebuild

Hey all! New to the forum. I'm building a 1979 Ford Crew Cab with a 12 valve Cummins. Did a rebuild of everything except the bottom end.

So after getting everything back together I'm cranking (no fuel) and do not have oil pressure. Did about 4 cranks at 15-20 seconds each.

After much research, I have a few ideas of what is going on. I did NOT pack the oil pump with Vaseline when I installed it. This will help create suction for the pump and help suck oil through the pickup tube.

The worse case is that there is a crack or leak in the pickup tube, creating an air leak and not allowing the pump to create suction. I think the chance of this is very low, and to fix or check this I need to take the oil pan off, which is a huge PITA!

Anyone ever start up a rebuilt 12 valve? Is there something I'm missing, or should packing the pump work?

Thanks!

-Kyle
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Old 05-05-2017
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pullinforme pullinforme is offline
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are you using a manual gauge to determine oil pressure or relying on the lie to me gauges
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Old 05-05-2017
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Prelubing the pump is essential. The option at this point is find an oil galley plug and pressure prim the system that way. Enough oil will get back to the pump to get that oil seal it needs.
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Old 05-05-2017
meatloaf meatloaf is offline
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Quote:
Originally Posted by pullinforme View Post
are you using a manual gauge to determine oil pressure or relying on the lie to me gauges
I have a manual gauge I am using. I actually have a clear line running to the gauge so I can see if oil is flowing in the line. I also removed a valve cover to see if I were getting oil there and didn't see anything.

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Originally Posted by cougar View Post
Prelubing the pump is essential. The option at this point is find an oil galley plug and pressure prim the system that way. Enough oil will get back to the pump to get that oil seal it needs.
I'll give that a shot! Sounds like the easiest solution at this point.

Thanks for the replies!
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Old 05-05-2017
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You can prelube the engine via the plugs in the oil filter adapter, I'm pretty certain the 12 valve had them. Just be sure to plumb into the one that goes to the outside of the oil filter. (Filter flow is from the outside to the inside)

We have a setup that looks like an air tank, it has a standpipe in it, you fill with engine oil, and then pressurize it with shop air.
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Old 05-15-2017
meatloaf meatloaf is offline
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We've got oil pressure! Packed the pump with Vaseline and within 10 seconds of cranking I had pressure. Thanks all for the help!
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