Driving with Blown Headgasket - JeepForum.com
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post #1 of 8 Old 10-27-2012, 08:06 PM Thread Starter
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1995 YJ Wrangler 
Join Date: Sep 2012
Location: Sunshine Coast
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Driving with Blown Headgasket

Hello fellow Jeepers,

I have recently discovered that my headgasket has gone on my 4.0L from my '95 YJ. When checking the oil there is an un-healthy amount of coolent, along with slight gurgling sounds right after driving. The engine is also starting to sound like a diesel. I am curious as to what the consequences maybe if I continue driving my YJ in its current state? I am not sure when it may have first gone but i suspect may have already driven a month with it blown. This includes a fair few strenuous hill climbs and off-roading. The engine doesnt appear to ever overheat, and there doesnt seem to be any large amount of fumes coming out on start-up. I am planning on doing this repair ASAP but as things are going I lack the time and alternate transportation to work. When I do replace the headgasket could there be any added problems from the prolonged driving with a headgasket blown?

Cheers, Nic

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post #2 of 8 Old 10-27-2012, 08:20 PM
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1993 YJ Wrangler 
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Had an old car with the same issue, never over heated but the head cracked.
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post #3 of 8 Old 10-27-2012, 08:46 PM
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Not a good idea.
If coolant gets in the oil it will likely destroy the bearings.

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post #4 of 8 Old 10-27-2012, 10:11 PM
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Could also end up warping the head.

In any case, not a good idea to drive with a blown head gasket. All you are doing is risking increasing the cost of repairs.
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post #5 of 8 Old 10-28-2012, 12:02 AM
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I would avoid driving it at all costs or it could cost you.
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post #6 of 8 Old 10-28-2012, 01:08 AM
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It will cost you more in the long run. It will only get worse.
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post #7 of 8 Old 10-28-2012, 02:44 AM Thread Starter
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Thanks for the quick reply's! I guess it looks like I will be taking the bus for awhile then! While I have the top of the engine apart is there anything else I should look into replacing while I have the opportunity?
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post #8 of 8 Old 10-28-2012, 06:59 AM
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Look at the top of the block where the head gasket is broken. Some times when the break is in between cyl the exhaust pressure will start to carve a groove there. If that is case you would need the block machined back flat.
Also take head to machine shop and have them check for cracks and deck it.
Changing HG is not hard. Its knowing what to look for that can be a little tricky. You should be able to tell with in a few seconds after the head comes off where the leak is at. It may be a crack... Most times head gaskets when they let go its not long before the coolant fills the cylinder after you shut down. Then when you try to crank it, the starter forces the piston and rod out the side of block. Cause you aint compressing water
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coolant , driving , head gasket , knocking , time

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