Moparts

priming my engine before start up?

Posted By: jimmy71demon

priming my engine before start up? - 09/09/09 12:47 AM

is there a difference betweeen priming ur engine with a drill, and jus turning it over with no fire or fuel pump? what is the proper way to prime an engine before start up?

thanks in advance
jimmy
Posted By: MNobody

Re: priming my engine before start up? - 09/09/09 12:51 AM

With a drill and a priming rod.
Posted By: Challenger 1

Re: priming my engine before start up? - 09/09/09 12:53 AM

You take the dist to oil pump drive gear out of the motor and stick a oil pump priming rod in the oil pump and spin it with drill. Do that first and then turn the motor over by hand while spinning the drill motor and then youre done. Put it back togeather and start it.

There's three different ones in this picture for a Mopar. The one with yellow tape on it is homemade fron a peice of 1/4" chrome moly tubing. It's primed a bunch of 3000HP hemis with 60W oil.
Adj push rod and primer tool for Chev too.
Posted By: RapidRobert

Re: priming my engine before start up? - 09/09/09 02:46 AM

Quote:

what is the proper way to prime an engine before start up?


Take out dist/intermediate shaft, Home Depot has a 5/16" paint stirrer shaft for cheap. Take out/off the plugs/valve covers & have someone turn the crank slowly w a breaker bar & 1&1/4 socket while you man the drill up top until both rocker arm assy's get their oil. Then I take off the rocker arm assy's & (re)goop up the lobes/lifter bottoms then bolt the rocker arm assys back on to make sure I have PLENTY for startup and that too much didn't get wiped off in the crank turning ordeal. A bit excessive maybe but after thousands in time/money into it getting a bit anal at the very end doesn't bother me especially when it's SO close to fireup time. EDIT On your bench grinder trim/smooth several inches of the rod & wrap it w black electrical tape where it goes thru the bronze bushing to protect it.
Posted By: Lefty

Re: priming my engine before start up? - 09/09/09 05:20 AM

Get one of these at Summit Racing for $7.88

http://www.summitracing.com/parts/DCC-4286800/?image=large

Mark where the rotor is pointing so you can put it back in the same location. Pull the dist and drive under it.

Insert the tool hooked to a drill that runs in the direction the dist usually turns.

Run the drill in the correct direction while cranking the engine with the starter.

When you see oil from the rockers you're done. I don't pull the valve covers, just look through the oil fill hole.
Posted By: Magnum

Re: priming my engine before start up? - 09/09/09 06:22 AM

I prefer drill prime too.

The reason you stay away from the starter is it may take hundreds of revolutions of the engine to build oil pressure with the starter. In the meantime your bearings recieved no oil. Nothing up to the rockers yet either, which also means no drainback. So the camshaft lobes are dry too.

Now even with the perfect prime. The cylinder walls are not all lubed and the connecting rod small end (wrist pins)are still not lubed.
This is why after priming, it is essential to get the engine to fire up on the first hit.

Have the distributor pointed correctly and the carburetor bowls filled.
Posted By: jimmy71demon

Re: priming my engine before start up? - 09/09/09 06:38 PM

thanks guys! u see my buddy and i both did rebuilds this summer for the first time. him a pretty much stock rebuild on a 318, and me a 416 stroker. thats y i have been asking a lot of "newbie" questions cause we both want to be sure of what we are doing. neither one of us really had the money to do it in the first place, so we definatly cant afford to start all over again! but i (we) really appreciate all the input and information from u guys. when ever we get snagged or stumped this is the first place i come to get answers!

party on Wayne!
Posted By: StandOnIt

Re: priming my engine before start up? - 09/09/09 10:22 PM

On new engines, I drill prime mine while its stil on the stand with the intake and valve covers off. I can see whats going on and make sure oil is getting everywhere it needs to. After the engine is in and she is ready to go, I prime her again for a min or so, button her up and lite the fires. The only time I touch the starter is to lite her up. Dont want to spin it over on "dry" bearings. Also, when you do it on the stand, you can check your pan and lower seals for any type of leakage.
Good luck with the new engines and enjoy them.
Posted By: DaytonaTurbo

Re: priming my engine before start up? - 09/09/09 10:47 PM

Also, remember when you put the primer rod in your drill to set your drill to reverse. Looking down on it from the top the pump spins counter clockwise.
Posted By: buildanother

Re: priming my engine before start up? - 09/10/09 12:35 AM

But Jimmy's doing a small block, man! clockwise
Posted By: dOrk !

Re: priming my engine before start up? - 09/10/09 03:40 AM

Quote:

Get one of these at Summit Racing for $7.88

http://www.summitracing.com/parts/DCC-4286800/?image=large






That Summit/MP piece .... NOTHING more than a simple 5/16 hex steel stock ... but something a BUNCH best-er .. a steel or even an aluminum rod with a plastic PVC coating on-it to protect the bushing.

Electrical or duct-tape aint gonna cut-it !!
Posted By: DaytonaTurbo

Re: priming my engine before start up? - 09/10/09 04:13 AM

Quote:

But Jimmy's doing a small block, man! clockwise




Sorry, my bad, clockwise on the small blocks, counter clockwise on the big blocks.
Posted By: pishta

Re: priming my engine before start up? - 09/10/09 04:39 AM

we primed a big block with one of those differential lube pumps, stuck the plastic tube with no tip in the threaded oil filter boss (fit pretty good) and pumped..and pumped. We actualy got a reading on our oil pressure guage and oil up top in the rockers. Spun a full filter on and kicked her over. Ghetto, but I think it worked...It was sunday night and no place was open to buy the 5/16 hex shaft.
Posted By: Rug_Trucker

Re: priming my engine before start up? - 09/25/09 01:10 AM

Last time I fired a new engine I primed it on the stand. Saw 2 black flakes come out of the head. I was able to grab them!

Too bad a slant can't be primed like a V-8. I guess you just pack the pump with Vasoline.
Posted By: jimmy71demon

Re: priming my engine before start up? - 09/25/09 02:02 PM

hey thatks guys i really appreciate the input. this is my first rebuild so im trying to get all the info i can!

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