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Unread 11-04-2013, 01:43 PM   #16
Robert1964
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Okay......you guys were right on the money.....I pulled the pump today and the plastic impeller has completely seperated from the shaft on the back of the pump.....what ever happened to the steel impellers water pumps used to have on them. Just goes to show ya......they don't make them like they used to. I just want to thank ALL YOU GUYS for your help...... YOU GUYS ROCK!!!!!

I will update yall once the new pump is on and its back running...

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Unread 11-04-2013, 01:45 PM   #17
MuddyWJ
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Quote:
Originally Posted by Robert1964 View Post
Okay......you guys were right on the money.....I pulled the pump today and the plastic impeller has completely seperated from the shaft on the back of the pump.....what ever happened to the steel impellers water pumps used to have on them. Just goes to show ya......they don't make them like they used to. I just want to thank ALL YOU GUYS for your help...... YOU GUYS ROCK!!!!!
I think Napa auto has metal impellers still. They did for my mustang.
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Unread 11-04-2013, 03:05 PM   #18
michiganmaveric
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Originally Posted by MuddyWJ View Post
I think Napa auto has metal impellers still. They did for my mustang.
Make sure, the one I got 4 years ago from NAPA had plastic. They might have both types, just have to ask.
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Unread 11-04-2013, 04:34 PM   #19
McGR
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One of the "improvements" for the 4.0 WJ engine introduced in 1999 was an "improved" water pump. Unfortunately, the improvement included the newly re-designed plastic impeller. Earlier 4.0 motors had a typical stamped metal impeller. To the best of my knowledge the various pumps available for the WJ 4.0 will have the plastic impeller. If someone knows otherwise please post the source.
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Unread 11-04-2013, 04:54 PM   #20
Tagg
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Just purchased this from Ebay a couple of weeks ago. Metal Impeller.

http://www.ebay.com/itm/150623033631...84.m1439.l2649
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Unread 11-04-2013, 04:58 PM   #21
MuddyWJ
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Just purchased this from Ebay a couple of weeks ago. Metal Impeller.

http://www.ebay.com/itm/150623033631...84.m1439.l2649
How's it working for you? Any oddities during install?
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Unread 11-04-2013, 05:11 PM   #22
rugsWJ
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Out of curiosity how hot were you running? My WJs both run around 210-215 so I always jsut though jeeps ran a bit hotter.
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Unread 11-04-2013, 05:18 PM   #23
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We purchased this WJ with a bad 4.0 engine. We installed the replacement engine with a New 195* thermostat, this water pump and hoses. It shows on the temp gauge as almost 1 notch below the center temp of 210*. It may move very slightly about 5 degrees. I would say it is running about 190*.
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Unread 11-04-2013, 05:26 PM   #24
MuddyWJ
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Quote:
Originally Posted by Tagg View Post
We purchased this WJ with a bad 4.0 engine. We installed the replacement engine with a New 195* thermostat, this water pump and hoses. It shows on the temp gauge as almost 1 notch below the center temp of 210*. It may move very slightly about 5 degrees. I would say it is running about 190*.
X2 on temp. Just replaced cooling system and used correct fluid as well.
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Unread 11-08-2013, 08:52 PM   #25
rep-tile
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I know for a fact that Carquest carries the pump with metal impeller. Part #51-1867. The plastic ones tend to break off.
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Unread 11-14-2013, 03:57 PM   #26
Robert1964
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I just want to say thanks to all the guy's that told me about the water pumps on these jeeps having plastic impellers. THEY DO !!! Mine had broken off the shaft just like you guy's had said yours did. Had 135,000 miles on it. I've just had never seen one do this. It made absolutly no noise and did not leak a drop of antifreeze so I had not bothered to check it. But that was the problem. Head is fine. Over heating was not severe enough to blow head gasket or cause any other damage. It sat so long that I now have a sticky brake caliper which I'm replacing tomorrow. Thanks guys for all your help. By the way, NAPA has metal empellers and they are pressed onto the shaft. The NAPA pump also cools better than the original (before it broke) NAPA'S pumps are $3 more than advance auto and are lifetime pumps. NAPA PUMP $59.99
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