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Ironic, they had to use a picture of a truck with the infamous folded hood.

They probably can't test a 24v starter.

A good starter should pull the system down to 21-23 volts while cranking.

In my CUCV I had a throttle shaft seal fail (normal mode of failure for DB2 pump). This let the pump drain back to the tank through the lift pump. Replacing the lift pump resolved the issue for about a year before it came back worse. The symptom was that any time the truck sat for more than 8...

As long as the heat can convect up to the cylinder head, it only needs to get a few cylinders warm to get a start. My 6.2 would start fine at 80 degrees without glow plugs. You'll get a lot of smoke until the other cylinders start firing. This may not be the best for your engine but should be ok...

Diamond Diesel sells OEM seal kits for the DB2 pumps. They're about $100 for a kit. I don't know anywhere you can get individual parts, maybe John Deere. They used a lot of DB series pumps on their engines.

I'm guessing that is for stress relief to prevent cracking between the valve seats. It isn't an uncommon feature of higher horsepower engines. It may promote stress relief by encouraging cracking in acceptable areas. The heads on 6.2/6.5 diesels have similar relief and will typically crack in...

If you want on engine hoses that last, you'll need to use high temp rated hose such as Parker 206 or 426 or Aeroquip FC234. These hoses are great for oil and diesel fuel and do ok with hot water.

I have my new engine with oil in the pan on the stand. I have to resist the temptation to turn the crank as it will pump oil if I do.

Instead of chasing 5 degrees of coolant temp, run synthetic oil. Look for ester based oil if you can find it.

You can buy the 20 HP VFD for the 10 HP motor. You key in the motor power during the setup process. You can't set up a VFD for 20 HP and use it to drive a 1.5 HP motor. The VFD has auxiliary outputs. You could potentially use it to switch another motor off and on but it can only provide...

It's hard to say that coolant temperature has much effect on efficiency. The cycle is nearly adiabatic so outside temps have little effect on anything. Higher coolant temps do reduce cylinder wear rates and prevent cylinder glazing. I am going to have to provide some documentation to back this...

You program the VFD to the motor so your 1.5 HP motor could be damaged if the VFD tries to run it as a 20 HP motor. The VFD also does some condition monitoring and may trip if it sees the motor circuit open as the relays change over. You could probably disable this.

Is central VA Middle East hot? The HMMWV earned it's reputation in the hottest desert.

Coolant recovery is surprisingly unimportant. When the system is at its hottest, the system will be full. We know this from off-road motorcycles. Of course, who wants to waste coolant finding a that perfect level.

In my industry we generally find it less expensive to fly in labor because the hotel cost is less than paying travel time each day for the local labor.

The engine, transmission, and transfer case are the most reliable parts of the HMMWV. It's everything attached to those components that fails.

This has been a problem for a very long time. https://www.sae.org/publications/technical-papers/content/250031/

That really depends on your oil cooler type. With an air to oil cooler, the oil will not get to an adequate temperature while idling to remove condensation from the crankcase. Without an oil cooler the same is likely true. With an oil to water cooler you can get your oil hot enough while idling...

Don't do it. The oil is in the pan, away from the heat generating parts of the engine. If you're just idling it, the oil doesn't get hot and accumulates moisture. The only reason to start a vehicle regularly is to keep the battery charged. Better to do this with a battery charger. Engines with...