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Unread 03-02-2010, 02:24 PM   #1
restorod
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water pump "r" reverse rotation

hey guys..im in the middle of a water pump install..my napa replacement pump,does not have an "r" stamped on any of the impeller fins,however the direction of the fins are going the same way,so i am good to go right?? whether there is an r on the new one or not...right?? napa says they dont know of any different pumps for a 4.0 97 tj..thanks

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Unread 03-02-2010, 02:29 PM   #2
2jhanna
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I would go with it.
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Unread 03-02-2010, 02:33 PM   #3
restorod
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first time i even had heard of it was on this forum...but fins look to be the same direction,so guess i will go "GIT ER DONE"
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Unread 03-02-2010, 02:38 PM   #4
never monday
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"R" can also mean right or reman
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Unread 03-02-2010, 02:55 PM   #5
TexanTJ
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Id install it and go from there. R could stand for anything like a brand, remanufactured, reproduction model, right.

Im 100% sure that it wouldnt stand for reverse. The only thing that pops into my head with a reverse flow cooling system would be a GM LT1.

The fins are going the same way so your Good To Go!.... Like a crunchwrap from taco bell
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Unread 03-02-2010, 02:59 PM   #6
SilverBullot
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Go for it, my replacement pump did not have an R on it either. My Jeep hasn't blown up....yet
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Unread 03-03-2010, 04:55 PM   #7
lupinsea
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Starting in 2000 or 2001 Jeep switched to a reverse rotation water pump and there are warnings blasted all over the FSM from those years about making double and triple sure you install a reverse rotation water pump for those engines. They claim that reverse rotation pumps are stamped with a "reverse" or "R".

It has to do with how they routed the serpentine belt on the later years. The engine fans for those years are also reverse rotation, too.

I was concerned about this because when I got my replacement pump the pump wasn't stamped with an "R" or anything. Yet when I finally took off the OEM water pump they were identical. And after reassembly everything is in good order with the engine temps right where they should be.


THAT SAID. . .

If your new pump matches the shape and direction of the fins of your OEM pump then I'd say you are in good shape. Go for it.
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Unread 03-03-2010, 05:33 PM   #8
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Quote:
Originally Posted by lupinsea View Post
Starting in 2000 or 2001 Jeep switched to a reverse rotation water pump and there are warnings blasted all over the FSM from those years about making double and triple sure you install a reverse rotation water pump for those engines. They claim that reverse rotation pumps are stamped with a "reverse" or "R".

It has to do with how they routed the serpentine belt on the later years. The engine fans for those years are also reverse rotation, too.

I was concerned about this because when I got my replacement pump the pump wasn't stamped with an "R" or anything. Yet when I finally took off the OEM water pump they were identical. And after reassembly everything is in good order with the engine temps right where they should be.


THAT SAID. . .

If your new pump matches the shape and direction of the fins of your OEM pump then I'd say you are in good shape. Go for it.
The pre 2000 water pump won't properly bolt up to the 2000 and newer 4.0L. Nor will the fan clutch even come close to mounting on the water pump...
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Unread 03-03-2010, 06:16 PM   #9
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Quote:
Originally Posted by TexanTJ View Post
Id install it and go from there. R could stand for anything like a brand, remanufactured, reproduction model, right.

Im 100% sure that it wouldnt stand for reverse. l
An "R" on a water pump impeller absolutely stands for reverse rotation. (Which is not to say that all reverse rotation impellers are so marked.)

Quote:
Originally Posted by lupinsea View Post
Starting in 2000 or 2001 Jeep switched to a reverse rotation water pump...
Jeeps have been equipped with reverse rotation water pumps since way before 2000.
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Unread 03-03-2010, 06:18 PM   #10
Mean Max
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Stamped with an "R" or not, you can tell them apart by the shape/direction of the impeller. I put this thread together with pics a while back.

http://www.jeepforum.com/forum/f12/w...torial-893428/

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