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Old 01-06-2013, 01:49 AM
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Catnip 0_o's Avatar
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Signs of a Head Gasket going?

2002 TJ 4.0L
142k Miles Stock Motor

Today I was under the hood inspecting everything to make sure all is well and I noticed on the side of the block on the passenger side inbetween the head and block where the head gasket is that it was slightly wet in that area. Back in the summer I could notice it being slightly wet looking as well but I havent had any issues with my gasket and my oil pressure has remained the same since I bought the jeep over a year ago.

I was just curious if this "wetness" that which appears to be coming from the head gasket means its getting worn and I might have a big fix on the way?

Also my Engine Oil PSI is roughly 40 at idle and when crusing gets up to about 50-55, is that an average PSI?

Thank You
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Old 01-06-2013, 02:36 AM   #2
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Oil pressure isn't the only indicator of head gasket failure, the most common indicator of failure in the 4l is coolant in oil. You can do a cylinder leak down test which not only indicates bad head gasket but can also tell you if you have bad valve seats, worn piston rings and will tell you if you're losing compression..

It's also worth noting that 00-03ish cylinder heads are prone to cracking due to excessive heat build up. Most commonly they will crack between cylinder 3 and 4. If you're due for an oil change soon do it yourself and check for milky/mocha color in your oil, which usually isn't seen until it's almost done draining. Often times it's not even seen on the dip stick either.

If you don't find any I would still do a leak down test (or take the Jeep in to have it done) just to rule out any possible problems

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Old 01-06-2013, 03:45 AM   #3
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Take the oil filler cap of the top of the engine, if either the underside of the cap or round the filler neck has any white gunge that's normally an easy sign if a blown head gasket.
1998 TJ Sahara- sold
2003 TJ Grizzly- sold
2009 JK Rubicon-sold
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