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Old 10-16-2013, 03:12 PM   #1
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Question Help Diagnosing Coolant Leak?

Hi guys,

I was hoping your educated eyes could help me diagnose a slow Coolant leak my LJ is suffering through;

It's a 2005 Wrangler Unlimited (LJ) with 105k miles.

I believe I have "located" it to the area indicated in these photos. I checked above and don't see anything leaking down..




Thanks in advance for any help you can offer!

Dylan

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Old 10-16-2013, 03:16 PM   #2
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Use a bright flashlight and carefully check your hoses, radiator, and waterpump. When had a slight leak (like yours), it was seeping out the gasket between the waterpump and engine block.

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Old 10-16-2013, 04:07 PM   #3
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That's what it looks like to me.. the gasket looks like its in rough shape. If indeed I find nothing else, was this a DIY job for you? Just swap out the gasket, flush and fill?

Thanks,
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Old 10-16-2013, 04:08 PM   #4
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I'll find a link for you when I get a chance, but there is an UV dye kit you can buy to add to your coolant.
You add it, idle the motor at operating temp for about 15min then check the system with a cheap UV light. Any leaks will glow bright.
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Old 10-16-2013, 04:15 PM   #5
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Leak

X2 on the hoses, gasket and water pump. With the warmed up engine off, use a clean, dry rag and wipe under a hose. After each hose wipe, look at the rag for moisture (you might already know this!). Are they original hoses? Just asking...
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Old 10-16-2013, 04:56 PM   #6
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Quote:
Originally Posted by CJ7258
Are they original hoses? Just asking...
I bought it at 42k, so they probably are original, yes.
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Old 10-16-2013, 05:39 PM   #7
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There is a weep hole in the water pump casting immediately under the shaft that can drip when the shaft seal is on it's way out. And that's where you will see it drip from.
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Old 10-25-2013, 01:02 PM   #8
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OK.. I believe the pulley in the photos is the Crankshaft pulley, and thus I would say the crankshaft seal is on the way out, as you say.. I have to bring this in to a mechanic, as I'm busy with work on my grandma's house right now.. Do I just request the mechanic replace the crankshaft seal? Or should I have the waterpump done as well, or perhaps hoses? I am fairly certain the leaks are coming from only this seal, just as Jim says.
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Old 10-25-2013, 01:36 PM   #9
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The crankshaft seal would only leak oil if that was the case. To determine if the pump is leaking you will need to thoroughly inspect all the hose connections and gasket seals at the water pump and the thermostat housing immediately above.
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Old 10-25-2013, 02:08 PM   #10
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I will say more than likely it is the water pump. Mine had the same symtoms, plus you can't see the weep hole with the pully installed.
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Old 10-25-2013, 03:23 PM   #11
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Thanks so much, guys!

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