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Old 06-01-2006, 12:28 PM
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Oil to lifters in rebuilt 350

I recently bought a 50 chevy pickup project. It has a rebuilt 350 with quite a few really nice internals. I pulled the engine and changed the cam to a milder one .
Before I tried to start it I primed it with an old gutted distributor and a 1/2" Milwaukee drill motor. The rpm of the drill is 950 rpm. I never got oil flow to the lifters. I checked all the galley plugs that I know of and even put in a new Melling oil pump The most pressure I have attained to date is 20psi. I used both a mechanical and the electrical gauge. There are no external leaks. I'm pretty sure there is no internal pluggage since I've had it down to the short block and it's clean, very clean. What am I missing?!!

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Old 06-01-2006, 03:25 PM
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A few things to check:

Is the pump pick-up TIGHT in the pump body?
Is the distributor housing part of your priming tool?
What kind of oil filter are you using?

tom
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Old 06-01-2006, 03:54 PM
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The pickup is pretty snug. That is I didn't have to drive it in but it wasn't loose and it bolts to the pump housing. Yes the priming tool is an old distributor with the gear removed. The filter is a Fram PH 30.
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Old 06-01-2006, 04:30 PM
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I think your problem is with the Fram filter. Swap it out for anything but a Fram and see what happens.

BTW, I had a customer who spent over a week trying to figure a low oil pressure/aeration problem. Ended up his pick-up SEEMED tight (bolt on style), but was loose enough to cause his problem.

If nothing else, seal around the pump pick-up with some epoxy to see if that doesn't cure it.

You should have to drive the pick-up into the pump. Push-in isn't tight enough.

tom
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Old 06-01-2006, 05:43 PM
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I did the same thing on mine and with my 1/2 drill was able to get over 60 psi
I would try changing the filter and try again. Fill the filter up before you install it.
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Old 06-04-2006, 06:22 AM
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Thanks guys. I'll try all these things later today I hope. I'm at work right now,[have to support my hobby].
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Old 06-04-2006, 12:39 PM
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Quote:
Originally Posted by 2lo50
I recently bought a 50 chevy pickup project. It has a rebuilt 350 with quite a few really nice internals. I pulled the engine and changed the cam to a milder one .
Before I tried to start it I primed it with an old gutted distributor and a 1/2" Milwaukee drill motor. The rpm of the drill is 950 rpm. I never got oil flow to the lifters. I checked all the galley plugs that I know of and even put in a new Melling oil pump The most pressure I have attained to date is 20psi. I used both a mechanical and the electrical gauge. There are no external leaks. I'm pretty sure there is no internal pluggage since I've had it down to the short block and it's clean, very clean. What am I missing?!!

I read the whole thread.

Your drill is turning the pump at 1900 engine rpm.

I have never seen a problem with a Fram filter.

SBC are notorious for losing oil out the lifter bores making low pressure, but you have NO oil to the LIFTERS ?????.... so obviously you do NOT have the intake manifold installed, that is how you are seeing the lifters? How else do you know you don't have oil to the LIFTERS? None of them?

If a gallery plug were missing, and you still (?) have 20 psi @ 1900 rpm, there should be SOME oil to the lifters.....

Let me consult my crystal ball......
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Old 06-04-2006, 02:49 PM
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Quote:
Originally Posted by xntrik
I read the whole thread.

Your drill is turning the pump at 1900 engine rpm.

I have never seen a problem with a Fram filter.
Neither have I as I have never used one, and that is for a reason.

Quote:
SBC are notorious for losing oil out the lifter bores making low pressure, but you have NO oil to the LIFTERS?????....



...so obviously you do NOT have the intake manifold installed, that is how you are seeing the lifters? How else do you know you don't have oil to the LIFTERS? None of them?

If a gallery plug were missing, and you still (?) have 20 psi @ 1900 rpm, there should be SOME oil to the lifters.....

Let me consult my crystal ball......
I see we are in rare form today...

I would imagine he does not see oil at the rockers. If he has a good mechanical gauge and it is only showing 20psi at the rear of the galley, he has a serious problem. You have to run the primer maybe five minutes or more on some engines to see oil come out of the valvetrain.

Prime the filter (Purolator) and check for aerated oil. I thought SBC pickups were driven into the pump body (special tool). Has somebody changed something on me? Last I did was an 86 TPI.
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Old 06-04-2006, 04:44 PM
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Thank you, Duke, thank you..

Seriously, he said lifters so I conclude he means LIFTERS, not rocker arms.

Yes, as he said "the most" is 20 psi at 1900 rpm, that is seriously poor. His implication is that the new Melling oil pump is as bad as the first.

At 1900 engine rpm should be pumping more than a gallon per minute, which should fill all the galleries, etc. in less than a minute, which indicates to me a "volume" problem. Maybe sucking air, maybe dumping oil out internally somewhere. Aeriated oil, while priming?

Since it is a SBC, could the internal bypass be dumping pressure??? Lots of racers plug the bypass.

If the oil pressure is being taken at the end of the gallery like Smokey recommended, and not the beginning, 20 is borderline at that rpm.

But that still will not explain lack of oil delivery to the "top end".

I have read that some off-shore lifters had the oil shoulder on their circumference incorrectly located. Small base circle cams also can be a problem in this area.

I bet Tom is right, the pickup is sucking air.

Just kicking out ideas.
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Old 06-05-2006, 09:50 AM
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Today I had the pickup tube brazed to the pump. I also bought an AC Delco filter. I'll be trying it all out tonight.
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Old 06-05-2006, 11:22 AM
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Is the drill motor spinning the same direction as the distributor when the engine is running ????
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Old 06-05-2006, 09:57 PM
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You need to check the pickup to pan clearance, it needs to be 3/8 to 7/16 off the floor.
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Old 06-05-2006, 11:07 PM
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low oil psi

When you had the engine all apart did you check the oil passages for the cam bearings( are they lined up with the main's etc. ?)
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Old 06-05-2006, 11:36 PM
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Solidaxel and Lilsmoke both asked the same questions I was going to ask.

Double check the drill is spinning the correct direction, if you're getting some pressure then the drill is probably going to be turning the right way. It never hurts to check though.

Absolutely check your pickup to pan clearance. On the first engine I put together I took the advice of somebody that said to use JB Weld to hold the pickup in the pump housing. After about four months I started noticing very low oil pressure (like 10 psi at 2000 rpm). I dropped the pan to find the pickup was just barely under the oil level in the pan and had nearly fallen out of the pump. Basically the pump was sucking a lot of air and a little bit of oil. Needles to say, I havent used JB Weld since...
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Old 06-06-2006, 07:39 AM
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Did you prime the oil pump? Pack the internal gears with petroleum jelly. Then try it. I think this may solve the problem.
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