1974 HZJ40 Build

Joined
Sep 29, 2014
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189
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Springfield, MO
Did you put a sensor in there? That would be a neat thing to monitor although I don’t think you have a ton to worry about with 33” tires and no hydroboost or hydro assist. cooler steering fluid is always better though.
No sensor; I'll check it with an IR thermometer.

Wiring is done, and it is running and driving, but there is a significant oil leak from the back of the head gasket. I take it in Tuesday to have the windshield put in, then I'll start pulling the head.

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davegonz

Keeping it Weird
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Pretty cool build.

You could 3D print a mold and use some air hardening urethane to make a flexible gasket. I guess you could use a flexible 3D printing filament too if your printer supports it.
 
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nice work Charlie. Ps cooler shouldn't be an issue where it's at, I've mounted several in that location before. How bout that moment when you realize the taillights have to come back off to bolt the tub back down. :)
 
Joined
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Messages
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Springfield, MO
Pretty cool build.

You could 3D print a mold and use some air hardening urethane to make a flexible gasket. I guess you could use a flexible 3D printing filament too if your printer supports it.
Thanks. I've been using flexible filament for a bunch of body plugs and grommets, like this one for the 4x4 vacuum lines.
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nice work Charlie. Ps cooler shouldn't be an issue where it's at, I've mounted several in that location before. How bout that moment when you realize the taillights have to come back off to bolt the tub back down. :)
Yeah, I'll check the fluid temp, but I really doubt it will be a problem.
It wasn't as bad as the moment I realized that this had to happen... :bang: It was leaking so bad that after 50 miles of driving, the rear axle was covered in engine oil.
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Gaskets and head bolts arrived yesterday, precups and valve stem seals should be here this evening. There are no visible cracks on the head and it doesn't appear to be warped. I'll take it in to the machine shop tomorrow to have it magnafluxed and cleaned. Hopefully they can get it in quick and building the exhaust doesn't take too long because I need to put some miles on it before the solid axle summit.
 

lelandEOD

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Aug 21, 2012
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Back of the head gasket. Looks like it was from the pressurized oil feed hole to the head. The mating surface around that hole was coated in oil.
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Hmmm... that's equal parts interesting and disturbing. How were the head bolts in that area when you pulled the head? I can't imagine that it would take a terrible amount of clamping pressure to seal the oil orifice hole (especially compared to the clamping pressure required to seal the combustion chambers.

I would have suspected the rear cam seal would be the most likely source of a leak? Was it wet around the back end of the valve cover.

Let us know what the machinist says about the head.
 
Joined
Sep 29, 2014
Messages
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Location
Springfield, MO
Hmmm... that's equal parts interesting and disturbing. How were the head bolts in that area when you pulled the head? I can't imagine that it would take a terrible amount of clamping pressure to seal the oil orifice hole (especially compared to the clamping pressure required to seal the combustion chambers.

I would have suspected the rear cam seal would be the most likely source of a leak? Was it wet around the back end of the valve cover.

Let us know what the machinist says about the head.
Valve cover or rear half moon plug was what I thought at first too, but it was definitely coming from down lower. The head bolts were all tight, but some were tighter than others - makes me wonder if someone re-torqued them or had the head off at some point. It still had the original gasket, so that would mean that it was reused, but, considering some of the other work that was done to the powertrain, reuse of a head gasket wouldn't surprise me.

BTW, once I have it back together I'll probably post a video showing the gauge cluster, wiring, and everything else that I haven't been posting over the last month.
 
Joined
Sep 29, 2014
Messages
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Springfield, MO
Very nice swap dude. You'll work through the issues.
I hope so. I'm moving out next month and don't want to be driving back every weekend to finish it.

The head should be done Monday and the last parts order is due Tuesday, so I am hoping to get it in for the exhaust by the end of next week. That would give me a couple of weeks to break in the diffs and gain some confidence in it before the 3000 mile trip.

The soft top arrived today, but the bow kit still hasn't shipped. Might have to rush the powder coater to get done in time.
 
Joined
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Messages
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Springfield, MO
The head came back yesterday. The machine shop installed new valve stem seals and verified that it was not cracked and that the warpage was within spec. The old precups had not yet fallen apart, but a few of them were developing cracks. Now it has a set from Engine Australia.

After driving ~100 miles today, there was no oiI leakage, so I'm calling that job a success. I installed the wipers, so it should pass inspection now. It goes in Friday morning to be inspected and get an exhaust.
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