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Unread 09-22-2008, 10:18 PM   #1
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Replaced water pump....still leaking coolant. HELP PLEASE

Hey guys, I've had a coolant leak coming from the crank pulley area for the past week, so I concluded it was the water pump and replaced it today. Install went smooth. When I started the Jeep up, the leak was still there coming from the same spot. I'ts REALLY tough to see if it's actually coming from the water pump gasket or the crank seal, or somewhere else. Have any of you had this experience? Could I get some input on what I should do next? This is my DD and with it leaking coolant so heavily (constant drip when hot), it's almost not usable. If it means anything, it's running a little hotter than normal as well. Thanks in advance fellas!

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Unread 09-22-2008, 10:31 PM   #2
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Quote:
Originally Posted by imped4now View Post
I'ts REALLY tough to see if it's actually coming from the water pump gasket or the crank seal, or somewhere else.
If coolant is leaking from the front crankshaft seal, you have real problems!!!

Did you put some sealant or Teflon tape on the heater fitting?

Last edited by tangofox007; 09-22-2008 at 10:45 PM..
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Unread 09-22-2008, 10:55 PM   #3
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If coolant is leaking from the front crankshaft seal, you have real problems!!!

Did you put some sealant or Teflon tape on the heater fitting?
Yes I did. It's not leaking and I'm fairly sure the new water pump isn't leaking, but I still wouldn't discount it since it's my first water pump replacement. I think I'm just going to take it to a shop tomorrow (something I hate doing) to have them check it out. But the thing is, I've wheeled the jeep at the badlands twice this summer but have been very considerate and easy on it, at least from my point of view. I haven't high centered it, given it a lot of gas or came down hard on anything down there. The leak just started out of nowhere after a trip to the badlands, in which I had replaced the fan clutch the day before that trip. Does anyone have experience with a crank pulley seal (or whatever you want to call it) leak? Will this be difficult/expensive to repair? Could it be something else, like the heater core or oil pan gasket? This is just driving me NUTS and I'm just looking for some answers. Thanks fellas
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Unread 09-22-2008, 11:08 PM   #4
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The crank seal and oil pan gasket would leak oil, not coolant. The heater core would be leaking in the cabin, not the front of the engine. Odds are severely stacked in favor of the leak being from the water pump gasket. Or a hose.
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Unread 09-23-2008, 07:17 AM   #5
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I'm betting on the water pump gasket too.

How did you install it?

Did you thoroughly clean the mating surface on the block? What did you use to clean it?

Did you use silicone with the new gasket and on both sides?
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Unread 09-23-2008, 08:14 AM   #6
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If it is the same leak before and after install then i would think a hose connection. I mean, even if the install was bad then it should have changed the leak ( making it alot worse or somewhat better ).

Basically you need to make everything near it sparkling clean and bring some lights there. Its the best way. Take the fan shroud and fan off too. Might have to take radiator off to get to fan.

I replaced 2 water pumps in about 2 years andonly 12,000 miles. But ... i did go threw deep mud like 10 times.

O yeah, where did u get the pump? is it OEM? Refurbished?
My NEW bosch pump had the wrong screws and fan mounting bolts. Pissed me off so much. Stripped one of the holes had to go back to pep boys and pull my old bolts off. Pain in the ASH!

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Unread 09-23-2008, 08:20 AM   #7
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The old gasket is pretty time consuming to get completely off (at least it was for me). There are a lot of little areas that are hard to scrape. If you are not completely sure it was done correctly, it could be that.

Another thing is that the paperwork that came with my new water pump had a big bold notice on it that the new pump could leak through the weep hole while it was breaking in. Mine didn't, and I don't know if that's a common thing or not.

Last edited by djt283; 02-25-2009 at 10:54 PM..
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Unread 09-23-2008, 08:40 AM   #8
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Alright thanks guys. I'm going to go through the install again. I got the water pump at Autozone. It's a Duralast model.
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Unread 09-23-2008, 08:54 AM   #9
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A scuff pad works pretty good for cleaning the block.

A cookie wheel works even better, but most people do not have one of these handy.
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Unread 09-23-2008, 08:55 AM   #10
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One other question guys....how do I burp the system for air bubbles?

EDIT: Nevermind, I think I understand how. But is it safe to let the engine get up to temperature with the radiator cap off?
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Unread 09-23-2008, 09:03 AM   #11
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Yep, its safe.
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Unread 09-23-2008, 09:45 AM   #12
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Quote:
Originally Posted by tangofox007 View Post
The crank seal and oil pan gasket would leak oil, not coolant. The heater core would be leaking in the cabin, not the front of the engine. Odds are severely stacked in favor of the leak being from the water pump gasket. Or a hose.
That's exactly what I want to hear....that's relieving. Thanks.
Quote:
Originally Posted by djt283 View Post
The old gasket is pretty time consuming to get completely off (at least it was for me). There are a lot of little areas that are hard to scrape. If you are not completely sure it was don't correctly, it could be that.

Another thing is that the paperwork that came with my new water pump had a big bold notice on it that the new pump could leak through the weep hole while it was breaking in. Mine didn't, and I don't know if that's a common thing or not.
Yes, mine has that. I'm hoping that's why it's leaking.
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Yep, its safe.
I'll report back.
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Unread 09-23-2008, 01:25 PM   #13
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Problem fixed. It was the gasket and the fact that I did a crappy job cleaning the mating surface on the engine block. After 45 minutes of polishing that surface and getting the old gasket off with a putty knife, it was looking great. I put the water pump and new gasket back on and bam....no leaks. Thanks guys!
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Unread 09-23-2008, 01:59 PM   #14
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Sorry you had to do it twice. That's a common mistake for first timers. It is easy to miss some of that hardened gasket. It's hard to get to the lower left portion on the block, too, huh?
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Unread 09-23-2008, 02:30 PM   #15
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Sorry you had to do it twice. That's a common mistake for first timers. It is easy to miss some of that hardened gasket. It's hard to get to the lower left portion on the block, too, huh?
Hell yeah it was....that was the toughest area. I'm so stoked I got it fixed, though. And while I was working on it, Mr. UPS man showed up with my new lift.
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