Replacing L134 Head Gasket

Gr8dain

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Feb 7, 2021
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I was driving the 3a last week and all of a sudden I had coolant blowing smoke through the exhaust. Dragged it home and let it sit. Finally got around to pulling the head today to confirm the gasket was toast.

i olan on using aviation thread sealer and installing new studs and nuts. I plan on using a copper gasket and using cooper spray for the gasket. i need to install a thermostat as I found out that the PO did not install one.
So, any advice on this job before I start? Any particular t-stat? Any other parts to fit it in? I saw a little metal cylinder on Ron Fitzpatrick’s site for the t-stat.
 

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Gr8dain

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The metal cylinder is the thermostat retainer that keeps the thermostat in position. Need to buy the stat, retainer and the gasket to do the job.
Thanks. I have ordered all 3 of those parts. Along with the studs, nuts, gasket, spray, etc. i am thinking of having the head magnafluxed.
 

Gr8dain

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I strongly suggest using old school permatex type II on the stud threads and water pump bolts.
That is the plan. Gonna get some soon. Along with the spray copper. And I am taking the head to a machine shop to be hydrofluxed (or whatever the name is).
 

rybangerter

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Mar 10, 2021
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Also, be sure to drill a small hole in the thermostat. Since they sit up in the horn, air needs to pass through the hole to allow the coolant to rise. If you look at the old thermostats, they all had small holes. If you don't drill the hole, get ready for some overheating. Ask me how I know. :)
 

Gr8dain

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Also, be sure to drill a small hole in the thermostat. Since they sit up in the horn, air needs to pass through the hole to allow the coolant to rise. If you look at the old thermostats, they all had small holes. If you don't drill the hole, get ready for some overheating. Ask me how I know. :)
Do you have anymore info on this? Like exactly where to drill it? And how big? In the actual thermostat or the housing?
 

rybangerter

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Do you have anymore info on this? Like exactly where to drill it? And how big? In the actual thermostat or the housing?
I believe I used the 5/64 bit. Don't go too small because the hole can clog, I had that happen. drill the hole towards the outer edge of the thermostat. Install the thermostat in the horn with the keeper in place and that will give you a good idea of where to drill the hole.
 

Gr8dain

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Got the head back from the machine shop today. Looks awesome. Needs some paint now
 

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Gr8dain

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Painted the head. The white is not perfect. But neither is the Jeep. It will do.
 

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JAKSJEP

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Feb 18, 2021
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Have the block checked to be sure it is level. I had my head done but didn't have the block checked and it continued to blow head gaskets. Had both the head and block machined and no more blown head gaskets!!
 

Gr8dain

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All of the parts are now here. But I am heading out of town for the weekend. So it will have to wait a bit.
 
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Gr8dain

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Finally had a day where I did not work late. So I replaced the head gasket and took it on a successful test drive. I have never seen my temp gauge this cool. Which is good. I will keep testing it.
 

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Gr8dain

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Love it when things work well!
Me too. Took it on another drive today to celebrate the win and the beautiful weather. Doing great!
 

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