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Straight 30w diesel oil is rare. 40w was the standard grade. There is a 20w40. It's zinc free for engines with silver faced bearings. Runs fine in a John Deere 4045, though. Maybe it's not so good if you have a flat tappet cam.

If there is no drop there is nothing happening. In that case do be suspect of the pilot side of the circuit, the signal to the starter relay.

What does the battery voltage do when cranking?

If it uses the same principle behind MLS gaskets, Viton rubber on steel shim, they'll do fine. If I knew about them previously I would use them.

Interesting, I saw your picture and assumed it was just new bolts. I've never seen an axle flange gasket. As long as it's metal backed it should be fine.

I do recommend using anaerobic gasket maker on the axle flange. It doesn't seep like silicone does.

The square bodies have a very shallow firewall notch so length is an issue for many swaps. Electric fans can free up space on the front of necessary. The frame rails are also somewhat narrow so look for routing options for the downpipe. I put a center mount turbo 6.5 in my truck. I had to push...

There is no component that is specifically prone to leakage. Renew the old seals and use as few gaskets as possible. I built my engine using only intake manifold gaskets and a water pump gasket. Everything else got anaerobic gasket maker or RTV. Transfer case was done with anaerobic gasket...

Every GM V8 I have opened has had a worn front cam bearing. Definitely a good idea to renew.

If you drive your AC motors with a variable frequency drive you need 0% excess power to be able to start the motor. Direct online starts require 50% excess available and soft starter land somewhere in-between. VFD's are cheap!

Engine running with volt gauge in yellow means the alternator isn't charging.

Yes, the 6.5 pan will fit your CUCV frame. I made a new dipstick tube out of some copper tubing. I brazed a wire ring in the bottom as a stop, cut the tube a little long, bent it to fit, brazed a bracket to grab an exhaust bolt, put 7 quarts oil in the pan (-1 for the filter), cut the top of...

You can also use a battery charger and some zinc to galvanized it.

It needs to be coated with something not soluble in diesel fuel. I'd try soaking it in some engine coolant first.

If you can, get a more modern rim size. I bought some steelies from a contemporary Dodge for my M1008, up from 16 to 17. It opened up a whole new world or tire options without drastically altering the appearance of the truck. I can't speak specifically for the 15" rims.

Diesel engine testers need to be more sensitive because they have more excess air in the exhaust and less CO2. They require special fluid as a result. Otherwise, no bubbles is a good sign. I don't think those 318s were prone to head gasket failures. No bubbles is a more valuable result than no...

I recently had a Cat 3512 blow a head gasket. Despite a constant flow of bubbles through the tester it never turned colors. I even had the special diesel fluid. Were you getting bubbles through the tester? Here is one bubbling furiously and here is the head with soot stains where it was leaking.

You can always change it later. Now that the t-stat housing is open I strongly suggest filling the engine to the top of the t-stat housing, removing the water pump belt and running the engine.

You could add a volatile corrosion inhibitor to the fuel tank. https://www.aircraftspruce.com/catalog/eppages/vpci326_1.php

If you open the t-stat housing, fill with water until it overflows, and run the engine with the belts off you may see bubbles indicating a leak.