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Old 03-22-2010, 11:12 AM   #1
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2000 4.0 Water pump ?

Just reading the haynes repair manual. It says all 4.0 engines require a reverse rotating water pump. At the parts store they never even metioned that did i buy the wrong one?

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Old 03-22-2010, 11:21 AM   #2
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If you go to a parts store and buy a water pump made for that motor it will be setup correctly. Water pumps are not generally interchangable between different motor setups.

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Old 03-22-2010, 11:27 AM   #3
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Look at the rear of the pump where the vanes are. If they are pointing the same direction as they are on the OE pump, you are golden.

One more thought... I would avoid buying one of the "lifetime warranty" store brand water pumps. They are shoddily made and you'll end up needing to replace it well before you would with a quality OE water pump. Your labor and inconvenience is worth more than the cost difference.

I obviously had a LOT of aftemarket parts on my TJ before it got stolen but not where it counts... I would use nothing but OE where the alternator, starter, and water pump goes.
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Old 03-22-2010, 01:54 PM   #4
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Quote:
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Look at the rear of the pump where the vanes are. If they are pointing the same direction as they are on the OE pump, you are golden.

One more thought... I would avoid buying one of the "lifetime warranty" store brand water pumps. They are shoddily made and you'll end up needing to replace it well before you would with a quality OE water pump. Your labor and inconvenience is worth more than the cost difference.

I obviously had a LOT of aftemarket parts on my TJ before it got stolen but not where it counts... I would use nothing but OE where the alternator, starter, and water pump goes.
OEM all the way. And never go rebuilt......NEW or nothing from an autoparts store.
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Old 03-27-2010, 07:47 PM   #5
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Auto Zone all the way.... Lol!
It's cheaper, replaceable with a lifetime warranty, close by and not leaving the industry tomorrow.

C.
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Old 03-27-2010, 09:07 PM   #6
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I hope you're kidding about that Autozone water pump. You couldn't make me run one of their cheap shoddily constructed water pumps. I don't care about its lifetime warranty, that won't get me home when it craps out prematurely out in the middle of BFE.
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Old 03-27-2010, 10:43 PM   #7
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About the only thing I'll buy from Autozone (AutoChina) is name brand chemicals, Valvoline etc. But even then, watch them close. The price they advertise on the shelf or in their ads is NOT THE SAME AS WHAT THEY RING UP AT THE CASH REGISTER.

I've submitted two complaints to Weights and Measures with positive proof of their fraud. They must have bought off the investigators - they are still in business and the manager still isn't in jail.

When they send you an ad in the mail but it's a lie - that's mail fraud!
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Old 03-27-2010, 10:50 PM   #8
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I always put new Federal Mogul water pumps in my cars. That was years ago, but the last one was still going strong after 175,000 miles.
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Old 10-15-2010, 12:18 PM   #9
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water pumps

im sorry but what exactly do you mean by OEM, is that aftermarket or factory. thx
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Old 10-15-2010, 12:24 PM   #10
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Oem is factory. Original Equiptment of the Manufacturer
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Old 10-15-2010, 12:24 PM   #11
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im sorry but what exactly do you mean by OEM, is that aftermarket or factory. thx

OEM refers to the company that originally manufactured the product.
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Old 10-15-2010, 12:25 PM   #12
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OEM means Original Manufacturers Equipment. It is the same as what the company puts on the vehicle at the factory. You pay more but it is better quality, especially on mission critical type stuff. Water Pumps, Starters, etc.
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Old 10-15-2010, 12:34 PM   #13
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well i bought the water pump from shucks auto and on the box has an OE stamp on it. am i good or should i return it. thx
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Old 10-15-2010, 01:14 PM   #14
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The 4.0 water pumps were made both ways - reverse and forward - and they will all fit. To be sure it's right, as Jerry said, look at the vanes. If they are pointed the same way as your original, it's right. The vanes are the only difference, but the wrong one won't work.

Shuck's auto - a discount place that sells Chinese and Mexican chap parts? OE can be stamped on anything! Means nothing.

A few days ago I was in an Autozone store (buying Valvoline on sale.) A guy came in with a starter - he was really mad. He told the counterman this was the 3rd starter in the last 6 months - all from Autozone. He wanted another on the "Lifetime Warranty." The counterman told him he couldn't do it - he's already used up his "LIFETIME WARRANTY!"

I left before the explosion!

Whose "LIFE?" Flim Flammers!
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Old 10-15-2010, 01:51 PM   #15
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good advice.
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Old 10-15-2010, 06:12 PM   #16
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I just put a napa water pump on my tj. My oem was labeled REV on the snout. But the new one ( not refurb) had no indication of being reverse flow. And according to napa it was regular flow.

When I removed my old one I compared the direction of the vanes on the back of the pumps. It was reverse. The install was smooth. And no leaks ( no rtv) and no overheating.

But now I need a clutch

Napa pumps are made by gates. But I did find out they are made in china. I'm of the impression all water pumps are made there. I think it's a luck of the draw type of thing.

But I got all new hoses, belt, coolant, t stat, and the new napa pump. For the price of the oem pump alone.

Rrich was a huge help to me with all my questions.
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Old 10-15-2010, 08:20 PM   #17
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is the water pump behind the fan or is it the pulley just below the fan??? thx
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Old 10-16-2010, 01:52 AM   #18
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I have 2 month old Autozone rebuilt front brake calipers..... Whoops!
I never thought about it before but this thread makes sense. Should I be making plans to get new ones ASAP? Where should I get OEM parts? It sounds like NAPA is the better place. I need to add that my 3 month old 97 TJ is teaching me quickly how to be a mechanic (in otherwords I'm relatively new at this stuff and don't know any better).
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Old 10-16-2010, 02:24 AM   #19
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I believe the 4.0 water pumps for the serpintine set up run reverse (counterclockwise) and are marked with an R. The V belt setup funs forward.
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Old 10-16-2010, 02:52 AM   #20
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Look at the history of the 4.0. It was born as a 4.2 - same block, same pump casting, same everything. The 4.2 had a Vee belt.

When they went to 4.0 no change - still the same pump.

When they went to a Serp belt, the way it's strung made the pump turn the opposite direction. No other changes, except now the impeller turned the other way, so the vanes had to be reversed so the water would flow the right way (goes in the top of the radiator and out the bottom.)
On those the OEM pumps had a stamp or embossment - either a R or REV was cast into to housing in the front to identify that it turns the other way. Also the impellers had an "R" stamped on it.

After a few years the serp belt type became the standard, they stopped putting the R or REV on new ones.
When you get a rebuilt most of them are of the older castings - REV or R can be on them. But rebuilders don't always go by that mark.

That leads to massive confusion - the only way to be sure you get the right one is to compare it with the one you took off. Don't go by the REV or R - it may be wrong.
Look closely at the impeller vanes - they should point the same way as your old one you took off. COMPARE THEM!
The castings are totally identical, just the impeller is different.

How do you tell once you put it on? If it overheats fast, and the radiator is not plugged, suspect the pump. Remove the thermostat and put the housing back on. Disconnect the upper hose from the top of the radiator.
Make sure it's full of water.

Start the engine - water should stream out of the top hose like a firehose - if it's correct.
If it's the wrong one, at best it may dribble a bit out of the hose itself, but the water will flow out of the radiator snout - backwards from what it should be.
That test is only valid if the thermostat is removed.

Don't assume the parts house will give you the right one - it may cost you an engine.
Just LOOK!
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Old 10-16-2010, 09:20 AM   #21
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I have never had problems with NAPA parts, and they are local guys most are gear heads themselves. Not saying you will get one with someone incompetent personnel, but at least in my experience with my local place most of those guys have been there at least 10 years. Heck a few of them were selling parts to my grandfather, just a bit slower now But like most anything today, you can never be 100% sure your part is truly American made. Even some OEM stuff isn't made in the USA anymore.
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Old 11-07-2010, 11:02 PM   #22
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Anyone know of a good write up on this, with photos and step by step instructions? I have a little seepage in my Water Pump so it looks like I'll be learning a lot more about it.
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Old 11-08-2010, 02:48 AM   #23
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it's not fun, I can tell you that...if money's not too tight I'd just pay. I don't mind upgrade work on my own rig, but I hate that 5 hour long maintenance job crap. pep boys can knock it out in less than 2 hours w/ a Bosch pump for about 150 bucks, and you won't end up with a puddle of anti freeze in your garage/driveway.

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