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Unread 08-16-2014, 01:40 PM   #1
kuematsu
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Radiator fluid leaks from fan shaft area

I have a bad coolant leak which comes from behind the center belt pulleys (right behind the fan), presumably from where the fan shaft enters the engine.

I have replaced the water pump gasket which didn't work. What is the likely source of the leak and does anyone know how to fix it or what areas I should focus on?

I really appreciate any help.
Thanks

P.S. I have an '86 Jeep CJ7 with a 6 cylinder, 258.

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Unread 08-16-2014, 01:50 PM   #2
OleBlue73
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Ready for a new water pump? I would've put one on there with the new gasket. The cost of a water pump is only worth my time for draining coolant down once.
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Unread 08-16-2014, 01:51 PM   #3
CSP
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That's your water pump that's leaking. There's a weep hole on the back side that the coolant comes from when the internal seal is shot.


The fan shaft doesn't enter the engine, it drives the water pump.


Sounds like you need a new water pump.
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Unread 08-16-2014, 02:30 PM   #4
LumpyGrits
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WP bearing is die'n.
Make sure you get the correct rotation on the new pump.
HINT: Take your old pump with you, and compare the impeller blades.
LG
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Unread 08-16-2014, 03:20 PM   #5
CJ7GUY30
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Water pump for sure. They are cheap and easy to replace. Let sealant cure before trying to turn it over after replacement.
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Unread 08-17-2014, 08:30 AM   #6
kuematsu
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Live 'n learn. Shoulda replaced it all when I was in there. Thanks for all of your help.
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Unread 08-17-2014, 09:35 AM   #7
LumpyGrits
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Quote:
Originally Posted by kuematsu View Post
Live 'n learn. Shoulda replaced it all when I was in there. Thanks for all of your help.
Welcome to the JEEP world-------
LG
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Unread 08-17-2014, 10:01 AM   #8
JeffreyCharles
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It's an easy job and won't cost you too much. Here's the process: http://jeep.smallcraft.net/water_pump/
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Unread 08-17-2014, 10:10 AM   #9
LumpyGrits
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Just make sure you use a thread sealer on the bolts that go into the water jacket.
LG
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Unread 08-17-2014, 07:52 PM   #10
kuematsu
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by "water jacket", are you referring to the water pump housing?

thanks to all again for all the advice + videos.
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Unread 08-17-2014, 07:58 PM   #11
LumpyGrits
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Engine block-Some of the bolts go into the water passage and if the threads aren't sealed. You'll have a leak--
LG
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Unread 08-18-2014, 06:03 PM   #12
CJ7GUY30
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Quote:
Originally Posted by LumpyGrits
Engine block-Some of the bolts go into the water passage and if the threads aren't sealed. You'll have a leak--
LG
I have never sealed "my threads" as long as you have a good clean surface and a good gasket it shouldn't leak. To each his own.
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Unread 08-18-2014, 07:35 PM   #13
LumpyGrits
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The gasket does NOT keep fluid from 'working' pass the bolt's threads and out past the bolt head.
The sealer will also keep the bolt from rusting/'freezing' in-place.
LG
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Unread 08-18-2014, 07:38 PM   #14
CSP
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Quote:
Originally Posted by CJ7GUY30 View Post
I have never sealed "my threads" as long as you have a good clean surface and a good gasket it shouldn't leak. To each his own.
That has been my experience as well. Put a WP in my CJ5 in '98 and it has no leaks or seepage.

It is a good idea though to use a non-hardening thread sealer, however. Nothing wrong with minimizing the risk of a future leak.
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Unread 08-19-2014, 02:11 AM   #15
grasmo
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I use Loctite 242 on any thread that enters a jacket. once a lesson is learned after fluid chases the threads and you have a leak, you'll never not seal them again. studs are much more sensitive to this than bolts but I still seal them.
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