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Old 03-01-2014, 03:12 PM   #1
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Coolant leak

Had a coolant leak. Replaced lower hose.
Water pump starts to leak. Replaced water pump/ gasket. New thermostat and gasket.
Changed oil and filter. Thought all was good to go. Fire it up and coolant is now leaking and running down drivers side of motor. Could it be the head gasket????

90 yj with 2.5L

Thanks

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Old 03-01-2014, 03:59 PM   #2
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Sounds like you didn't get the thermostat seated in the grove when you put the water outlet back on. Easiest way to make sure thermostat stays in place is to put about 3 small dabs of rtv on thermostat and put it in block, wait about 10 mins so rtv will have a chance to set then carefully put wateroutlet on and tighten the bolts. I usually use a gasket that has a sticky adhesive on it so it will stick to the wateroutlet.

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Old 03-01-2014, 04:39 PM   #3
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Will that cause coolant to leak under the exhaust manifold??
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Old 03-01-2014, 09:14 PM   #4
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Could be head gasket but if you're leaking enough to see it in that spot you'd have other problems. You sure it's not coming from the over flow tank or a hose in that area? Either that or check that thermostat in place and water pump gasket. Don't forget to put anti seize on those bolts either.
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Old 03-02-2014, 03:38 AM   #5
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It is leaking enough that I can see it running down the side of the motor. I will double check the coolant lines and gaskets. Motor was not run hot. So I'm hoping not the head gasket or worse.
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Old 03-02-2014, 09:06 AM   #6
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Quote:
Originally Posted by GG 90YJ View Post
It is leaking enough that I can see it running down the side of the motor. I will double check the coolant lines and gaskets. Motor was not run hot. So I'm hoping not the head gasket or worse.
Depending how far back the leak is. Frost plugs or block heater?
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Old 03-02-2014, 09:55 AM   #7
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Well went out this morning and got early start on pulling it apart. It is the exhaust/ manifold gasket that was leaking. Figured I've gone this far gonna go ahead and put new head gasket in too. Lucky me o'rileys has both in stock!!
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Old 03-02-2014, 03:00 PM   #8
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Doin work! Nice.
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Old 03-02-2014, 03:58 PM   #9
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The ole saying is true!!!!
Jeep isn't getting older, but newer one part at a time........

Got it all back together put water in and the D$&@ thing is still leaking in same place, I guess the only thing left on that side is the freeze plugs! They looked fine so I didn't replace them. Lesson learned when it is all apart, replace all that you can.
Looks like next weekend I'll pull it back apart one more time..... (
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Old 03-02-2014, 04:02 PM   #10
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This is the view from underneath.
Looking up between the front two cylinders just under the exhaust/intake manifold.

Does it look like a freeze plug gone bad?


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Old 03-02-2014, 04:06 PM   #11
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This is what the gasket looked like and the same exact area the coolant is leaking from.


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Old 03-02-2014, 06:49 PM   #12
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Update.......

While it was still leaking coolant a little bit, I topped off the water and fired it up. Surprisingly the leak stopped, I let it idle for a while and come up to temp. No more leaks anywhere.
Took it for a test drive for about 20 minutes and still no leaks. Check radiator when it cooled for a a little bit still full and no signs of oil or contaminates in it.
Don't know if it will start leaking again once it cools down but sure hoping not!!
This is my first time changing a head gasket and manifold gasket. It was a bit intimidating to look at all that has to be taken off but once I dove into it it really wasn't that bad.
Sure have learned lots from reading the forum again coodoos to all the members.
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Old 03-02-2014, 09:38 PM   #13
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Hopefully it doesn't leak after it gets cold. Keeping our fingers crossed
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Old 03-05-2014, 07:58 PM   #14
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Well lasted a few days but started leaking again today from same spot. This weekend I'll tear it down and pull the freeze plugs and replace them.
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Old 03-05-2014, 08:36 PM   #15
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Just a thought...
Why don't you run a section of heater hose directly from the water pump to the heater core connection on the fire wall, thus eliminating the water jacket in the intake manifold as your leak and confirming the engine is the source of your coolant leak. I have seen the aluminum in the manifolds get hairline cracks and they can be really difficult to see. The water jacket in the intake manifold is to warm the base of the carburetor to prevent "icing", I ran my YJ for several months with the intake manifold un-heated after some work was done, it didn't seem to suffer the diversion of coolant at all. Hope it works out for you.

I am assuming you have a 4.2 carburated, and not some wild upgrade in the vehicle.
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Old 03-05-2014, 08:42 PM   #16
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I was thinking it was the intake manifold that was cracked too. So I bypassed it and it still leaked. I checked that before I changed out the manifold and head gasket. Only thing left is the freeze plugs. If it still leaks after that, looks like I'll be getting a new motor.

I have the 2.5L manual

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