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Old 08-25-2012, 11:36 PM   #1
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What is correct oil pump rotation for priming?

I'm getting ready to fire up the new crate engine and wanted to know what the correct rotation is for the oil pump. I have a 4.0 2004 Wrangler. I've found some threads that say counter clockwise and some that say clockwise. Cant find it in the FSM. Anybody know the answer to this one?

Thanks!

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Old 08-26-2012, 07:30 AM   #2
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Quote:
Originally Posted by bohanm
I'm getting ready to fire up the new crate engine and wanted to know what the correct rotation is for the oil pump. I have a 4.0 2004 Wrangler. I've found some threads that say counter clockwise and some that say clockwise. Cant find it in the FSM. Anybody know the answer to this one?

Thanks!
I can't find proof online, but it should be clockwise, same as the rotation of the engine. There are only a few that go counter-clockwise....Honda and Corvairs.

I would check with your engine company for verification to make sure.

An alternative would be a PM to Jerry B. I'll bet he knows this for certain.

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Old 08-26-2012, 10:36 AM   #3
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Originally Posted by bohanm View Post
I've found some threads that say counter clockwise and some that say clockwise.
What drives the oil pump? Which way does it rotate?

I could just tell you the right answer, but you would have no way to evaluate it for accuracy.
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Old 08-26-2012, 10:38 AM   #4
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Originally Posted by 4wheelin View Post
I can't find proof online, but it should be clockwise, same as the rotation of the engine.
By SAE definition, the 4.0L engine rotates counterclockwise.
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Old 08-26-2012, 01:25 PM   #5
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From experience I can tell you it’s clockwise from the top. Remove the oil pump drive assembly (where the distributor used to be). Chuck something like a long screwdriver with the handle cut off into a drill. With the drill set for normal drilling (not reverse) insert the flat blade end into the oil pump slot & run the drill. As pressure builds you will hear & feel the drill bog down somewhat, you now have oil pressure. Mostly you just want to prime the pump & fill the filter. Any reputable engine builder will coat the critical surfaces with assembly lube so you are good to go there. Don’t run the drill too long or the oil will start to wash out that assembly lube.

I don’t know what the SAE definition is but here is what the FSM says.

DESCRIPTION - ENGINE
The 4.0 Liter (242 CID) six-cylinder engine is an
In-line, lightweight, overhead valve engine.
This engine is designed for unleaded fuel. The
engine cylinder head has dual quench-type combustion
chambers that create turbulence and fast burning
of the air/fuel mixture. This results in good fuel
economy.
The cylinders are numbered 1 through 6 from front
to rear. The firing order is 1-5-3-6-2-4 (Fig. 2).
The crankshaft rotation is clockwise, when viewed
from the front of the engine. The crankshaft rotates
within seven main bearings. The camshaft rotates
within four bearings.
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