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oil pump primer info

1033 Views 4 Replies 4 Participants Last post by  Coolblue65

this type above is nearly WORTHLESS

this type bellow works just fine
they are dirt cheap or you can make one from and old distributor

be sure you turn the engine over at least two full turns while applying pressure to and lubing the oil passages to get full access to all the lifters,rockers,bearings etc.

"Why is the first one worthless?"

LOOK CLOSELY, the top primer has no collar to keep the drive shaft centered over the pump so it can slightly mis-align and bind, Ive seen them bend the pump drive if guys get them mis-aligned and just throw a high torque 1/2 drill on and spin them without checking, the lower primer has an alignment collar that tends to keep things from breaking,,yes both have the alignment collar for the manifold but only the botom one has the lower block support and alignment sleeve that forms the lower oil passage wall, and the drive collar that assure the oil pump drive itself is lined up correctly,keep in mind,the bottom of the stock distributor forms one wall of the main oil passage to one side of the engine, without that passage wall in place you get no oil pressure to one side and darn little to the other due to the HUGE leak the missing oil passage wall presents, the lower distrib is temporarily replaced with that extra aluminum on the lower primer to simulate the correct oil passage config....THATS WHY!
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I was planning on heading to the junkyard to pick up an old ford distibutor to make one from- so I can prime my new engine.
If you assemble your engine with synthetic oil, fill the oil filter, and the set time from rebuild completion to start is less than a month (arbitrary value) then "priming" is an unnecessary step.

"Priming" is kinda like an old wives tale. If done properly, your engine will start within two to four revolutions (depending on ignition system) and oil flow will not be a problem.

I'd bet you can build an engine with new components (coated bearings, pistons, etc.) and start it up dry with ZERO oil and then say.. "Wait a sec.. I forgot to add oil".... then shut it down, add oil and never see a deficit.

If your build is poor and you have to crank the crap out of it to realize your mistake then "priming" may save a bit on wear.. But even then it is not likely to make a real difference.

"Priming" is pretty much a waste of time. It's akin to "break in". Your piston rings (if they are mainstream material) are "broken in" within several minutes of engine operation.
an old wives tail it may be, but the short block builder (DSS racing) and Comp cams specify to prime the system before start up- so I will.
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