What is YJ Water Pump and Why Do We Use Them?

Running warm at idle, so I thought I'd try a new pump. The old rusty one is what I took off and the new one is a Gates. The counter man at NAPA swears he sold me the right one, but I'm not sure about that. The engine in my Jeep is a 4.2 with a casting date in , probably the original engine, it has a V belt. Which pump is correct? Thanks!

So, the coolant was going the wrong direction in the engine? The guy I bought it from had a lot of engine work done and most of it needs redone. I did some research on line, watched some videos, but came up with conflicting data. There seems to be lots of confusion and misinformation from the manufactures on the 4.2 water pump. I did order and install a new pump for a , V belt 4.2, I received Omix # .13, the vanes went the same direction as the old rusty one I took off, so I assumed it was the right one. Still had cooling issues, and I wasn't happy with the poor casting of the Omix pump, so back on line I read that the correct Omix pump for my Jeep is .04. So, I Ended up going to NAPA yesterday to look at a GATES pump, that's when I discovered I may have had the wrong pump the whole time, I bought Gates TWP for $35.49. As a side note, I had to grind the casting on the Omix pump to clear the timing cover, ( wrong pump clue and I missed it) run a drill thru a couple of the bolt holes, heater hose outlet too large to attach the 3/4 hose. The heater hose outlet on the new Gates, easily accepts the 3/4 heater hose and the casting looks very nice. I'll install today and post the results. Thanks for all the help!!!!!!!!!

Water pump differences?

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Post by Defcon92 » May 8th, , 12:50 am

Click here to get more.

Do all 4.0 water pumps mount the same?

I read some. Info stating + water pumps has a redesigned impeller that was similar to the hesco option? 8 fin vs 5..thus better circulation? However I am unsure about using one in my jeep? The block is a 89 renix block going in a 92 cherokee. I was curious about running a 01-06 wrangler pump, IF there's an added benefit from just using a newer style pump that is?

Also my stroker has a paper type gasket with silicon on for the timing cover. Should I just yank that and run a felpro blue gasket? Valve cover & oil pan has the felpro gaskets.

Re: Water pump differences?

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Post by Defcon92 » May 8th, , 12:55 am

Few teasers.

Re: Water pump differences?

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Post by RenoF250 » May 8th, , 8:23 am

If you are looking for more details, kindly visit OKAYPARTS.

I do not know about the number of fins but Wrangler pumps are not the same as Cherokee pumps. The Cherokee has a different hole pattern with the bolts spread apart and it is shorter. I took an engine out of a 94 cherokee to put in a CJ and had to get a Wrangler pump.

The 5 fins looks like it will pump plenty. To make more flow I would make them deeper, not add more. Flowkooler is the way to go if you are worried about flow.

Re: Water pump differences?

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Post by SilverXJ » May 8th, , 11:11 am

Defcon92 wrote:I read some. Info stating + water pumps has a redesigned impeller that was similar to the hesco option? 8 fin vs 5..thus better circulation? However I am unsure about using one in my jeep? The block is a 89 renix block going in a 92 cherokee. I was curious about running a 01-06 wrangler pump, IF there's an added benefit from just using a newer style pump that is?

I have never seen a Jeep pump with 8 fins in the stock style. Always 5. I recall something about water pumps changing.. I also recall someone said rotation direction but that isn't correct as the pulley would have to be ribbed to run no the other side of the belt. I know the WJ water pump won't work on the XJ and probably the 00+ TJ pumps too.

Also my stroker has a paper type gasket with silicon on for the timing cover. Should I just yank that and run a felpro blue gasket? Valve cover & oil pan has the felpro gaskets.

That gasket should be okay with RTV. Isn't the Felpro just a thicker paper gasket?

Re: Water pump differences?

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Post by Defcon92 » May 8th, , 11:44 am

SilverXJ wrote:

Defcon92 wrote:I read some. Info stating + water pumps has a redesigned impeller that was similar to the hesco option? 8 fin vs 5..thus better circulation? However I am unsure about using one in my jeep? The block is a 89 renix block going in a 92 cherokee. I was curious about running a 01-06 wrangler pump, IF there's an added benefit from just using a newer style pump that is?

I have never seen a Jeep pump with 8 fins in the stock style. Always 5. I recall something about water pumps changing.. I also recall someone said rotation direction but that isn't correct as the pulley would have to be ribbed to run no the other side of the belt. I know the WJ water pump won't work on the XJ and probably the 00+ TJ pumps too.

Also my stroker has a paper type gasket with silicon on for the timing cover. Should I just yank that and run a felpro blue gasket? Valve cover & oil pan has the felpro gaskets.

That gasket should be okay with RTV. Isn't the Felpro just a thicker paper gasket?

The felpro I looked at showed the blue silicon type of gasket like the valve cover & oil pan? I figure those might be better? Especially for the timing cover since I'd have to pull the harmonic damper to get at it. And it's just be easier out of the jeep.



So 89 block into a 92? Use the 92 or 89?

Re: Water pump differences?

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Post by SilverXJ » May 8th, , 12:01 pm

Are you interested in learning more about YJ Water Pump? Contact us today to secure an expert consultation!

Defcon92 wrote:The felpro I looked at showed the blue silicon type of gasket like the valve cover & oil pan? I figure those might be better? Especially for the timing cover since I'd have to pull the harmonic damper to get at it. And it's just be easier out of the jeep.

The valve cover and oil pan have a silicon gasket option, which I would recommend over cork. The timing cover does not.

So 89 block into a 92? Use the 92 or 89?

If you are asking about the water pump there is no difference as the pasrts listing shows 87-01 for the water pump.

I also remembered the TJ water pump mounts the fan as well and it very different form the XJ.