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  #1  
Old 12-28-2007, 10:39 PM
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Solved!!! Rebuilt 401 Engine no Oil Pressure !!!

I just put the finishing touches on my 401 rebuild last night and fired her right up. But I am not getting any oil pressure, so I am looking for any help I can get. Here are the steps done so far.

Engine has been rebuilt with a new oil pump and new oil pump cover.
I have an AC Delco filter (the ones with the oil pressure relief valves in them)

1. I filled the crankcase with 4.5 Quarts of Joe Gibbs break in oil.
2. I pre-Lubed the Dizzy with Pre assy lube.
3. I primed the oil pump with an oil pump priming tool and a high speed plug in electric drill. (3 times for 30 sec-1 minute) It turns nicely with no binding.

-I turned the gears clockwise per the book and per Dizzy rotation.
-At this time I checked the oil gauge in the cab and it read 0 and did not budge at all.

4. I Then connected they distributor (with the positive wire disconnected) and cranked it for around 20 seconds.
-The oil gauge in the cab still read 0, and did not budge.

5. I then reconnected the distributor positive wire and fired her right up. She immediately caught and was pretty close to timed.
I ran the engine for 10-15 seconds, but the gauge still showed 0 oil pressure. So I shut her down.

6. I replaced the oil pressure sending unit with a new one.
7. I took the valve cover off.
8. I again primed the oil pump with the oil pump primer tool for 3x 45 seconds.
- No oil came out of the pushrods or the rocker arms.

So I am at a loss!! and I don't want to ruin my engine.

I bought a mechanical oil pressure gauge I will connect tomorrow, and I will pre fill my oil filter up as I neglected to do that last time.

But does anyone have any suggestions or Ideas of what I need to do next?

Thanks,
FLYUSMC

Last edited by flyusmc : 12-29-2007 at 07:02 PM.
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  #2  
Old 12-28-2007, 11:27 PM
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If it's not coming out the pushrod's something is wrong. Is the oil pickup in the pan hookup up right? Pull the oil filter and spin the pump with the drill, see if anything comes out. That's all I can think of for now.
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Old 12-29-2007, 12:01 AM
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Are you sure you put in all the oil galley plugs? I had the same 0 oil pressure problem on fire-up. Turns out the new freeze plug kit (and most I've seen) are 2 of the galley plugs short of being able to plug all the holes. I put in all that were in the blister pack, and thought I was done. I'd neglected to put in the two behind the timing gear. Pulled the front cover, put two more in from a new freeze plug kit, and have had good pressure ever since. Shine a light down the distributor hole while you crank it, and see if there are massive quantities of oil gushing out there. If the oil level going down at all while your pumping it?

Also - I pulled the intake while I was looking for the oil, and popped the two plugs there - when I didn't get much oil coming out there, I had a good idea where my problem had to be. If you need me to scan the manual sheet, too I can post it up....
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Last edited by JeremySmith : 12-29-2007 at 12:03 AM.
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  #4  
Old 12-29-2007, 12:13 AM
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I would check the plunger in the pump, more than once I have had them stick. When you prime it with a drill, it should not turn nice and smooth, the drill will torque against you increasingly harder as the pressure comes up. I would not start it again, untill you find out why you have no pressure. If you don't get pressure with the drill, you won't get it by running it.
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Old 12-29-2007, 01:28 AM
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I have also seen recently a timing cover gasket that did not have the holes for the oil galleys punched through. When installed, this convieniently produces zero oil pressure.


kris.
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  #6  
Old 12-29-2007, 01:32 AM
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Quote:
Originally Posted by Kris
I have also seen recently a timing cover gasket that did not have the holes for the oil galleys punched through. When installed, this convieniently produces zero oil pressure.


kris.
I too have seen this (in video format). Unfortunately I did not assemble the engine myself so I can't verify if this is the case or not with mine. I had a very well respected engine builder assemble it for me, as I was going to have him dyno it also.

As far as oil gushing out in the distributor hole when I prime it. I see none. Hopefully tomorrow I'll get to the bottom of this

-FLYUSMC
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  #7  
Old 12-29-2007, 03:14 AM
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You should see oil pressure when you are priming the engine too. So you can work this issue while the engine is not running. That would include turning the ignition on so you get power to the gauge. I suggest you disconnect the starter side of the solinoid and disable the HEI. Just to make sure the engine doesn't kick over while you are doing this.

Did you put teflon tape on the sensor? If you got a little over zelous with the tape then the sensor isn't grounded and will not send a signal.
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  #8  
Old 12-29-2007, 07:38 AM
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i just fixed my motor with no oil coming out pushrods dropped the sump oil pump pick up was full off sludge!!cleaned it out with air gun and bucket of petrol and oil pump housing/gears and blew thru oil pump and block wherever possible put back togeather now running 50psi..!!!!!!!!!!!!!
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  #9  
Old 12-29-2007, 08:54 AM
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if you've tried priming and nothing comes out, I'd yank the cover and check that gasket for the oil galley openings not being punched out.
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  #10  
Old 12-29-2007, 09:06 AM
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If this is terribly obvious, I didn't mean it to be, but I don't see anywhere that you packed the oil pump housing with petroleum jelly? If you do not it will definitly not pump ANY oil no matter how much you prime it with a drill.

Good luck,
Gabe
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Old 12-29-2007, 09:33 AM
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Quote:
Originally Posted by GabesGWagoneer
If this is terribly obvious, I didn't mean it to be, but I don't see anywhere that you packed the oil pump housing with petroleum jelly? If you do not it will definitly not pump ANY oil no matter how much you prime it with a drill.

Good luck,
Gabe

i think you're right gabe.

i run a bead of assy lube between all the gear lobes in the pump,get instant prime everytime.i don't care for vaseline in the pump.
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  #12  
Old 12-29-2007, 12:56 PM
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Quote:
Originally Posted by Ristow
i think you're right gabe.

i run a bead of assy lube between all the gear lobes in the pump,get instant prime everytime.i don't care for vaseline in the pump.


I don't either, but I didn't know what else to use. once upon a time I was out on a cold night(about 36F) and I packed an oil filter solid with the stuff trying to prime the motor I couldn't figure why the oil was to the pump, but not going any farther.......oh well.

Good luck!
Gabe
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  #13  
Old 12-29-2007, 06:37 PM
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No doubt a missing plug somehere in the block or a leaking or broken pickup tube. The plunger getting stuck can also cause this but you can usually see a few lbs even when its stuck.
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  #14  
Old 12-29-2007, 06:43 PM
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Quote:
Originally Posted by flyusmc
I too have seen this (in video format). Unfortunately I did not assemble the engine myself so I can't verify if this is the case or not with mine.
-FLYUSMC

I had that gasket in my hands yesterday.


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http://www.ifsja.org/forums/vb/showthread.php?t=97262
http://www.ifsja.org/forums/vb/showthread.php?t=104163
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Old 12-29-2007, 07:01 PM
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Okay all,

Thanks for the awesome suggestions. The first thing I
did was take the filter off. It was bone dry. So I
took the filter housing off and saw everything was put
together correctly.
I then filled the oil filter completly up, and filled
all the holes in the filter housing as well. I bolted
it up, and packed the gears with Assy Lube (I did not
have vaseline.)
I then primed it again and this time I could barley
spin the oil pump.
All of a sudden I heard a flowing gushing sound from
the oil pump area and bingo I had oil pressure to the
gauge! Just like everyone else said the oil pump got
very hard to turn but I never did see oil flow through
the pushrods.

But I cranked her up and she fired right up. With very
good oil pressure.

Now there is a problem getting the slow idle down. I
will post in another message, but the good news is
that she runs cool and has good oil pressure.

Thanks for your help all.

-FLYUSMC
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Old 12-29-2007, 08:26 PM
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Great to hear, Good going



Randy
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Old 12-29-2007, 09:52 PM
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Good deal.
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Old 12-29-2007, 11:00 PM
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be careful
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Old 12-30-2007, 09:15 AM
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I assumed you had already packed the gears with vaseline / assembly lube. You know what happens when you assume? Yeah....I end up being wrong

Glad to hear it's working!!!
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