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Old 07-19-2011, 06:38 PM   #1
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Coolant on the rocker arms / valve cover

So I had taken my 95 wrangler 4.0 to a mech friend and he replaced the rear main seal, oil pan gasket and the valve cover gasket. he said that there was some coolant on the rocker arms. I am not mech inclined (just know how to do enough to be dangerous) is this going to cause and issue and where is it coming from. When he was replacing the valve cover gasket he said that a few of the bolts were stripped. it is still leaking on the back side of the cover and that is where the bolts here messed up. any ideas out there on how to fix this. he replaced the gasket with the rubber one instead of the cork one.

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Old 07-19-2011, 06:49 PM   #2
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That's a weird place to find coolant, it's possible you could have moisture in the crankcase, it makes a yellow goopy looking mess when water mixes with oil, and in the valve cover is the first place you'll see it. Could easily be mistaken for coolant. If your Jeep makes or has made a lot of short trips without fully warming up for prolonged amounts of time, could account for that.

Or it could be coolant contamination from elsewhere in the engine. Was it actually fresh green coolant, or contaminated looking oil?

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Old 07-19-2011, 06:53 PM   #3
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fresh green
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Old 07-19-2011, 07:07 PM   #4
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Time to pressure test the cooling system and see if you have a leak somewhere.
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Old 07-19-2011, 07:14 PM   #5
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that is what i was thinking just afraid it may cause a bigger issue. not ready to do the head gasket yet since it will cost a little bit.
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Old 07-19-2011, 08:08 PM   #6
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Nope it won't cause anything more than is already there-- if there's a leak there's a leak, if not there's not. All you're doing is simulating the normal running pressure of the cooling system, without having to run the engine. If by chance you happened to spring a brand new leak while doing a pressure test (never seen that happen) then it was going to happen anyway next time the engine is warmed up.
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Old 07-19-2011, 09:09 PM   #7
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oh ok...just a thought could the thermostat be an issue. like i said i know just enough to be dangerous. i have noticed that the temp gauge on the dash does not seem to move. i have read several post about the temp sending sensor controlling that and also about the connections on the dash could be corroded. i just went outside to look at something and i pulled the fill cap on the oil and noticed that therew as some greenish liquid on it. i assume that is the coolant. he also put a uv dye in there to try and find the leaks. i also checked the coolant level and it appears to have went down since the last time that I checked it (a week ago). i plan on flushing it maybe this weekend if i get a chance. got a lot i am doing with it this weekend.
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Old 07-19-2011, 09:17 PM   #8
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as far as the bolts for the valve cover anyone know of a place that sells replacement bolts other than hitting the junk yard.
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Old 07-19-2011, 09:30 PM   #9
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I just brought one of my old ones to napa and they matched the size n thread for me. Cost like $2 for all of them
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Old 07-19-2011, 09:31 PM   #10
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take out one of the good ones, go to your local hardware or parts store, get however many you need and replace stripped ones......
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Old 07-19-2011, 09:32 PM   #11
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Sounds good. I will check there. Thanks
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Old 07-19-2011, 10:08 PM   #12
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Quote:
Originally Posted by yellowlabs View Post
oh ok...just a thought could the thermostat be an issue. like i said i know just enough to be dangerous. i have noticed that the temp gauge on the dash does not seem to move. i have read several post about the temp sending sensor controlling that and also about the connections on the dash could be corroded. i just went outside to look at something and i pulled the fill cap on the oil and noticed that therew as some greenish liquid on it. i assume that is the coolant. he also put a uv dye in there to try and find the leaks. i also checked the coolant level and it appears to have went down since the last time that I checked it (a week ago). i plan on flushing it maybe this weekend if i get a chance. got a lot i am doing with it this weekend.
The stat, temp sender, and bad connections could all be issues of their own but won't have anything to do with finding coolant on the rockers. That's not to say a bad stat couldn't be the first link in a chain of events. But still, fresh coolant on the rockers just doesn't add up unless there's a catastrophic internal failure in the head, or it was accidentally splashed in there during work.

Definitely have the cooling system pressure tested, it's a pretty simple test. If you suspect there's a leak there's no other logical thing to do first.

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