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Old 03-20-2010, 06:39 PM
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Is pre-lube of oil pump required before priming engine?

Old age has struck again. I just buttoned up my 302 and suddenly remembered I did not lube the gears in my new oil pump prior to installation. I am hesitant to pull the pan since I used a 4-part gasket and I think I got it installed just right, so I'd rather not disturb it if I don't have to. On the other hand, I don't want to fill the pan with oil and then have to drain everything down if the pump won't suck up the oil.

So the question is, can I spin the pump well enough with my drill to suck oil into the pump and get the engine priming process started without any pre-lube? I checked on the Ford Racing site and the instructions for their crate engines do not mention pre-lubing the pump...just using a drill to spin the pump and prime the engine.

Have any of you successfully primed your engines without first pre-lubing the oil pump?

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Old 03-20-2010, 06:47 PM
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If it matters cboy i never pre-lube the oil pump, Just pump the entire engine all together at the same time, Never any problems for me. Hope this helps . But hang around someone might beg to differ with me on this you never know. And yes you can spin the drill fast enough to prime the pump and entire engine, your using a 1/2 inch drill right?

Cole
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Old 03-20-2010, 06:52 PM
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Yeah, no problem. Just twist 'er up.
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Old 03-20-2010, 06:54 PM
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Quote:
Originally Posted by techinspector1
Yeah, no problem. Just twist 'er up.

Dang it Richard i wanted to say that.


Cole
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Old 03-20-2010, 08:07 PM
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If it were a big block Chrysler----have to pack those with petroleum jelly.
But those pumps are on the outside of the engine.
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Old 03-20-2010, 08:42 PM
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Thanks guys. That sure saves me some time and effort. I'll dump in the oil tomorrow and see how it goes.
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Old 03-20-2010, 10:22 PM
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Quote:
Originally Posted by eloc431962
Dang it Richard i wanted to say that.


Cole
You still can.
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Old 03-21-2010, 05:25 AM
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Quote:
Originally Posted by cboy
So the question is, can I spin the pump well enough with my drill to suck oil into the pump and get the engine priming process started without any pre-lube? I checked on the Ford Racing site and the instructions for their crate engines do not mention pre-lubing the pump...just using a drill to spin the pump and prime the engine.

Have any of you successfully primed your engines without first pre-lubing the oil pump?
Your question has already been answered very well by other members.

I will add that the way I decide that the system has been fully primed is to observe when oil is coming out at the rocker arms in both heads (if a V-8). Usually takes 5-10 minutes depending on the weight of the oil, the temp of the oil, and the RPM of the drill motor. Direction of rotation is clockwise.

I have never packed an oil pump before attempting to prime a system. I have read where some builders suggest that.

I don't know about the Ford engine, but a small block Chevy needs to have the priming tool with a collar to divert the oil around the distributor base hole down in the block in order to supply oil to both heads. I use a slightly modified distributor housing and shaft as the priming tool. Without the collar the oil will only supply one side and then the oil will get dumped back into the pan.
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Old 03-21-2010, 11:59 AM
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Quote:
Originally Posted by Frisco
...Direction of rotation is clockwise...

Clockwise from which viewpoint? It is my understanding that looking down at the pump from above, the rotation direction for the 302 Ford is counter clockwise. Looking up from below the pan, the direction would be clockwise.

I just looked it up again on the Ford Racing site and it says counter clockwise. But can others verify if that looking down from above or up from the bottom.
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Old 03-21-2010, 12:22 PM
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http://www.boxwrench.net/specs/ford_289_302-5.0.htm
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Old 03-21-2010, 03:03 PM
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Most pumps come with a good lube in them but it can't hurt to take the plate off and check. If the block was lubed the right way when it was built then just turn it over on the starter for 30 seconds before letting it fire up. You don't want to run the new pump dry or it can score the rotors.

My buddy built a SB Chevy 327 and didn't check the pump or try to turn it before he installed it. The second they cranked the engine the distributer gear broke because the oil pump was jamed,,,something had to give and the dist.,gear is the weak link.
By the way everyone that's thinking of using 50 Wt oil should think about the dist.,gear cause they can break trying to pump thick oil.
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Old 03-21-2010, 03:32 PM
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Every new pump I have ever installed has never been pre lubed. I do however take the new pump cover off and inspect the impellers for any foreign debris and I have found plenty on some. If it is sealing properly it will pick up oil from the pan as soon as it starts turning.

Vince
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Old 03-21-2010, 04:43 PM
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Quote:
Originally Posted by cboy
It is my understanding that looking down at the pump from above, the rotation direction for the 302 Ford is counter clockwise.
You are correct- Ford 302 distributor (and thus the oil pump priming direction) is CCW.

EDIT- I see TI linked to a diagram showing this already- my bad.

I think Frisco just had a twinge of "Chevy-itis", is all!
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Old 03-21-2010, 05:30 PM
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Quote:
Originally Posted by cboy
Have any of you successfully primed your engines without first pre-lubing the oil pump?

I've done it both ways, I just feel better packing the pump. I use a 1/2 inch drill and an old distributor body and shaft. For those that have never done it you'll know the second it primes.
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Old 03-21-2010, 06:00 PM
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Quote:
Originally Posted by royrammer
Most pumps come with a good lube in them
What pumps?

Quote:
If the block was lubed the right way when it was built then just turn it over on the starter for 30 seconds before letting it fire up.
This would ONLY be done if the proper prelubing tool wasn't available.

Quote:
You don't want to run the new pump dry or it can score the rotors.
A new pump has oil in it within a split second of hitting the preluber.

Besides, when it came apart for the endplay check (does ANYONE not check the oil pump endplay?) and deburring, it would have been lubed at that stage, anyway.

Quote:
My buddy built a SB Chevy 327 and didn't check the pump or try to turn it before he installed it. The second they cranked the engine the distributer gear broke because the oil pump was jamed
Sounds like someone didn't use a preluber, otherwise it would have been known the instant the drill was turned on- and didn't spin- that there was a problem.

BTW, I've never seen a distributor gear break from that. Or anything else, actually. Worn teeth- that's another thing.
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