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Unread 03-31-2005, 04:55 PM   #1
trickle26
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1994 YJ Wrangler 
 
Join Date: Sep 2004
Location: Wayzata, MN
Posts: 196
Water Pump ??? 5.2 V8

I have a coolant leak coming from the pulley in back of the fan. I believe this is the water pump going bad or already is shot??? I inspected all other hoses, the coolant resevoir and other areas around the radiator with no other drips.
I just want to get some insight if anyone else has had this problem
on their ZJ and if they have tackled the project on the 5.2- V8. I am at 91,000 miles.
Also, does the pulley system for the main belt automatically adjust via the belt tensioner or are there torque specs required for tightening/adjusting the belt??? The reason I ask is because I had a new belt put on about 10,000 miles ago and read that a main reason water pumps fail is due to over tightening of the belt.
The overtightening causing the bearings to give out. Is this accurate? or maybe my water pump just decided to crap out on me.

Thanks in advance for the help!

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97' ZJ Limited V8 - 5.2 liter
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past jeeps: 89' YJ
87' YJ Laredo
88' YJ Sahara
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Unread 03-31-2005, 05:26 PM   #2
todd17063
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sounds like the water pump is bad and the belt tensioner adjusts itself so no adjustment on your part is necessary..
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Unread 04-01-2005, 07:22 PM   #3
zjmike
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The belt on the 5.2 is self-tensioning. I know that many times the water pump leaks before it totally fails. Now is prolly a good time to replace it...before it totally dies!
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Unread 04-01-2005, 07:26 PM   #4
RAAB3485
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I would definately get to it as soon as possible too. On my old 4.0, when the water pump started to go, within a week or two it was losing easily a quart of coolant a day, and it was getting on the serpentine belt and getting flung all around under my hood making for nice white smoke, slipping belts, and huge nasty puddles under my car. It seems that once it starts to go, its a fast downhill slide from bad to worse. Fortunately (in a weird way) my Jeep was totalled before I fixed it and my new Jeep has a brand new water pump.
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Unread 04-01-2005, 07:35 PM   #5
ngathai
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I had the same problem on my 98 ZJ. A leak that I thought was at 1st around the base of the t-stat cover, (there was a small pool of coolant)...but unfortunately wasnt. It was a bad pump...cost me 400$ to replace, cus I also noticed while wrenching that my belt tensioner was bad (broken spring) & stealership wanted 90$ for a new one not to mention the bypass line also was leaking... get it done before it becomes much worse.



98 ZJ 5.2 quadra-trac w/ mods on the way
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Unread 04-01-2005, 08:48 PM   #6
trickle26
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Thanks everyone. Yeah, I went ahead and got the water pump replaced today to the tune of $400 . Not the kind of bill I wanted to stomach, but it is the cooling system and I realize this can be the lifeblood of engine longevity.
Major heat can be a killer. Also, thanks for the info on the belt tensioner and that is self-adjusting. I thought it was but wanted to double check with the brilliant people of JF.
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97' ZJ Limited V8 - 5.2 liter
94' YJ 4.0 ho -SE -
past jeeps: 89' YJ
87' YJ Laredo
88' YJ Sahara
90' XJ Limited
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Unread 04-02-2005, 09:56 AM   #7
kentman
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Next time, I say do it yourself. The pump and seals cost about $70. For the 4.0L, it was also a good time to put in a new belt ($15), new plugs ($35) and wires ($50), and coolant ($10). Now that is a lot of good work for only $180 and a couple nights of my time after work.

After I found and fixed my transmission cooler leak, I am now completely leak free which is always a great feeling, especially at 181K miles.
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Unread 04-02-2005, 10:47 AM   #8
dodger
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Water pump replacement

Quote:
Originally Posted by trickle26
Thanks everyone. Yeah, I went ahead and got the water pump replaced today to the tune of $400 . Not the kind of bill I wanted to stomach, but it is the cooling system and I realize this can be the lifeblood of engine longevity.
Major heat can be a killer. Also, thanks for the info on the belt tensioner and that is self-adjusting. I thought it was but wanted to double check with the brilliant people of JF.
I am not the best mechanic but:
I replaced the Water pump on my 96 JGC 5.2L. You will have to go farther into the beast than it appears form the outside. A small hose is tucked well down below so that the support plate for the alternator, power steering pump etc. has to come off. another small metal tube with an O-ring on it has to be carefully installed i.e. don't press it in at an angle or your have to get another O-ring. I am fortunate that I had another mode of transportation. What started as a weekend wrench fest turned into a couple a weeks of parts chasing. Wish I'd taken some photos...
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Unread 04-02-2005, 12:45 PM   #9
noreaga0221
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Join Date: Nov 2004
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I did mine and I bet I could do another water pump is about 40 minutes.

Drain coolant.
Remove shroud.. <--hardest part
Break fan bolt loose
Remove belt
Remove fan
Unbolt water pump


Parts cost? $35 for reman p[ump and about $30 for new upper and lower radiator hoses.

Labor? About $6 for a 6pack.
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