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McMaster-Carr sells it. https://www.mcmaster.com/coolant-hose/high-temperature-coolant-hose-7 https://www.mcmaster.com/coolant-hose/high-temperature-vacuum-rated-coolant-hose The top selection has a braided or spiral wire reinforced option. The braided hose cannot be bent. The bottom...

The engine and generator don't cool through the enclosure, they have their own pumped air. Go ahead and insulate the enclosure. But, make sure your insulation will tolerate 50°C temperatures.

If you use RTV only the straightness of the valve cover doesn't matter so much. Don't fall for the high temp advertising and whatnot. Silicone can be very permeable and will seep oil normally. The Right stuff black doesn't seep as badly as the classic red and blue RTVs. There is a new...

Don't make this complicated. The washers seal the sides of the fitting. The threads require additional sealing. You can use Loctite, an acorn nut, a nylock, pipe thread sealant, etc...

If you're using a nut and bolt you're going to need to use a capped or acorn nut otherwise air can leak along the threads of the nut. A new nylock nut may also seal sufficiently well.

A standard bolt will work. https://www.mcmaster.com/#92865A433

Why would Donaldson advertise it as a dust ejector if that were the case?

You can use a standards hex bolt with the sealing washer as a plug. Or, you can get something like banjo to JIC adapter and cap it. https://www.mcmaster.com/#4545K311

Just for clarity, advancing the timing is not the same as turning up the pump. Advancing the timing is done externally by loosening the 3 mounting studs for the pump and rotating the entire pump body.

What does the nameplate on your injection pump say? DB2829-**** or DB2831-****. As others have aluded, your pump may be for a turbo engine or turned up.

If you have any buddies with a machine shop, you can also Loctite some bolts in the holes, mill them flush and redrill straight.

The intake manifold bolt holes are different between the NA and turbo Optimizers. Because of that, no not all Optimizers work NA.

Other things to consider, the torsional damper from a 6.2 will not work on the optimizer. The water pump backing plates varies depending on which water pump you end up running. You need to get one with cylinder heads that match your intake configuration. Angled vs straight holes. You'll need...

In addition to the bellhousing and motor mount bolts, the oil cooler lines are 1/2 NPT on the Optimizer. You'll need to bush down to 3/8 if you want to reuse your 6.2 fittings.

If the bigger unit is available I see no reason not to run it. We run our generators at 10% load for 99% of their run time and they do fine. The big 8.1L engines got to burning oil but made it to 35k hours run-time. We replaced with 4.5 liter engines. Fuel consumption doesn't change much, they...

Here is a description of various connection diagrams for the generator. https://www.marathongenerators.com/generators/docs/manuals/Connection%20Diagrams.pdf

I'm OCD on stripped bolts. Helicoils, always. You can install one with the pan installed.

It's normal for the light to stay on until you bump the throttle.

Did you use the Gates brand belts? They're the only ones that tolerate the CUCV setup.

You can replace one. They're expensive right now. 3 years ago new injectors were $25 a piece. They're closer to $50 each right now.