The rear door seal has been replaced on the outer side the inner door needs to be completely pulled out of the Chinook looks like welds need to be broken. Replaced all the old rubber vacuum lines with silicone ones, color-coded some of the important ones yellow. De-rusted and repainted the fan guard, as well as red coated the inside of the gas tank.
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Im letting the gas tank soak in a bunch of vinegar. It will get a Baking Soda scrub after soaking for a few days, which should get rid of the acid and remaining rust. I will be installing New Hoses and fuel pump once its clean and re-lined and painted. I used the old rubber seal and some Kapton tape to hold the mixture in the tank. Ended up leaving the top vent line of the fuel sender open in-case the tank needs to breathe. Since i drive 30+ miles a day, a day or two of driving should do the trick.
The Engine is back in the engine bay, /w the Resealed L43 4 speed transmission and side linkage.
Have the gas tank pulled, being cleaned at the moment. Waiting for a rebuilt distributor since the original may have a damaged diaphragm. New Fuel pump and lines ready to go back in once the rust is removed, and the tank gets Red Kote lined from the inside.
Looking At replacing some aged and weathered parts. Water entry and regulator need to be replaced due to 30+ years of sun damage. Replacing hand pump sink with something more modern/electric. Hot side can be plugged into the regulator and cold side can be electric pump facing. May 3D print a separate base for the faucet to mount to /w switches for other 12V hardware.
Rust Cleanup begins, cleaning and de-greasing.
The engine is back from being bored, pistons and rings in hand. Identifying work that needs to be done on the transmission. Assembling the low and top end of the engine. Cleanup of bell housing and oil pan. Clutch kit is on order.
With a cheap harbor freight hoist the 20r engine and R43 transmission have been pulled. The block crank and head will be taken to a local shop to get bored honed and rebuilt. Cylinders didn’t look to bad for 80k miles. Since the Chinook had a blown head gasket, my guess is that it overheated since the thermostat was shot & the head bolts didn’t appear to be torqued properly.