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68 Unimog 404 Restomod

SuperMochombo

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And by the way I just have to shake my first at the sky. Keeps raining on my fresh paint. Can't get all the way around the doggone truck before it rains. This is the second time, and the weatherman said no rain. I threw some tools and probably made a neighbor blush.
 

SuperMochombo

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Pioneer kit done. I made mounting brackets out of a steel bed frame. Primed and mounted. I bedded all the screws with butyl tape. After the primer has a few days to cure I'll paint the whole shooting match sand color.

I've parked the truck pending new tires. Plenty to do in the meantime. Next step compress
 

Pohl

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North California
It looks like a lot of water sat in that tank for a loooooong time. the filter you shared earlier, and the amount of calcification on it was an omen.
The rear tank is perhaps in the same condition.
 

SuperMochombo

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Yes this truck sat a long time. Not a crime I plan to repeat. The back tank is holding fuel for now but yeah you aren't kidding. The fuel pump and carb were a complete mess too. I think the cap on the fuel tank must have been left ajar -easy to do- and leaked. Also I think water got in through the carb somehow too.

Soon it will be all new, the tank is the last piece of the system. Amazing it runs so well.
 

SuperMochombo

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Got the tank done, reinstalled and gassed up. No leaks. And the compressor back in too. Seems to be working because the brake pedal is better with more stopping power. The air pressure gauge on the dash isn't showing any pressure but the needle jumps a little when I hit the brakes. So something is going on. IMG_20240823_134304791.jpgIMG_20240823_145643303.jpg
 

SuperMochombo

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IMG_20240823_225255674.jpg
Midnight tank check. No leaks.

The fuel tanks are possibly the easiest part of a Unimog 404 to work on. Everything easy to get to, and in plain sight. 14 mm for the nuts n bolts. 17 mm for the banjo.
 

SuperMochombo

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A few weeks later and the tank repair is holding up fine. The new tank arrived and I plan to eventually install it. But for now it's ok.

I had a few problems with the fuel pump. The truck died on the way up a big steep hill. After a few hours of coaxing it ran again, then an hour later it died again. It was late, I was close to home, so I left it. Next day went and installed the electric fuel pump. While doing that I noticed the banjo bolt on top of the pump was loose, and in fact is stripped and won't torque.

Now I'm running on the electric pump. I bought a spare electric pump and several filters. Now Im covered if anything in the fuel delivery system fails.

I put the winch back on, and then started chasing the air system, hoping to improve the brake pedal. I had to get rid of the pressure regulator which was total crust, and added a pop off to the tank. I had to cut out a small section of hard line to unclog it, then suddenly had tank pressure, and then booster pressure.

What a difference! The brakes work twice as good. It's like night and day. I lucked out that it's working at all given the state of the rest of the components. But when you start the truck the dials on the air pressure gauge on the dash start to build pressure. When you hit the brake, the pedal feels firm, there's a few hissing sounds and the booster dial drops. Then if you pull the parking brake there's another hiss and the booster drops again.

I rode the brakes all the way down that big steep hill and it was no problem. Before, my leg was shaking!

Next I'll add a quick connect and see what I can do with it. I have about 8 bars of pressure in the tank, so should be able to air up the tires. IMG_20240912_152722599.jpg
IMG_20240911_194808413_HDR.jpg
 

SuperMochombo

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Those pics are the pressure regulator that apparently is needed for trailer brakes, which I don't plan to use. The regulator was toast, and the braided line between the tanks blew out. I cut the crimping off the fittings and replaced the hose with new hose rated 200 psi. Eliminated the regulator.

I went to a local Omni hydraulic hose making shop. They have everything you need, including adapters to get from the metric threads to NPT.

I still need to replace the antifreeze unit. I can get the original NOS from Expedition Imports, or go aftermarket. I'm planning to upgrade the compressor to a York 210 AC compressor eventually, which may need different components so I will wait on that a bit.

I will get proper pics of the whole system up.
 
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