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Combustion chambers wet with diesel will give abnormally high pressures on compression testing. Some diesel will burn due to pre chamber turbulence. Diesels typically have little manifold vacuum but worn valve guides can get oil seeping into the valves overnight.

Did you disable the injection pump by removing the pink wire? Because that oil would be diesel with soot. The glow plug and injector are in the precombustion chamber, a small spherical chamber in the head. The injector sprays onto the glow plug which induces a swirling flame in this chamber...

Ouch. Could be assembly error and they contaminated the valve with fingerprints, causing surface rust. This valve should be very free to move with the cover off. It should move with the throttle shaft. At idle, it needs to be slightly open and easily closed with finger pressure simulating...

Home Depot carries the gasoline variant. My original dealer sold out so I had to buy a gallon of it. The good news is once treated, the metering valve should be resistant to oxidation. I added to my post on the chemistry causes with a freshly overhauled IP. Biodiesel contaminated with...

Metering valves can get varnished quickly with bad fuel and air. It doesn't take much as the fit is very precise. Clean metal from a new rebuild is the problem as most transitional metals are oxidation catalysts for fatty acids. See Japan Drier additive for linseed oil based paints, it is a...

Sounds like a sticking metering valve. In the far past. I used Berryman B12 spray cleaner to remove the varnish on metering valves. It works BUT it must never be used through the pump or into the engine. Now I use Diesel Mechanic in a Bottle, just as aggressive as the...

If pushing the light load advance button causes stumbling, timing is correct. Keep advancing timing until pushing the button causes stumbling. Indirect injection is more tolerant of timing. But you could have a loose timing chain.

Try some Diesel Mechanic in a Bottle. The button seals can be replaced without IP removal. If the button sticks, it messes the timing and this is probably the issue. Timing sounds correct at idle. If it still stumbles with the pin free, you need an overhaul IP. Some rebuilders do the...

I sense this was a depot rebuild of the injection pump. There are 3 levels of maintenance, unit level like company or battery which is covered in the -20 TM, direct support which is battalion or brigade covered in the -30 and depot which is covered in the -40. Most TMs are multiple level, the...

If the timing is stuck, it is because of wear in the aluminum housing. Some rebuilders machine and sleeve the bore. Because you have a 4521 pump, it was probably a government shop rebuild and the TM doesn't cover sleeving the cylinder when worn. The photo on the first page looks like...

From the second video, I hear diesel clatter and a lot of it. Timing may be stuck, this happens with wear in the aluminum case. Does the engine smooth out at idle when the light load advance button is pushed in? Use a long screwdriver as this is on this bottom passenger side of the IP.

DB 2829-4521 is a CUCV IP. Specifically, a 1.2 centi Stoke JP8 rated pump for 1986 calibration. It is a 12 volt unit. It is a replacement unit as 1986 came with a 4520, the only difference being the low viscosity wear parts. Since the vehicle is a 1984, the original pump used the flex...

If the engine sounds like it is missing, it is a cylinder problem, not injection pump. This IP is a distributor type with only one pumping element all cylinders. Compression testing can show weak cylinder. A stuck valve can appear as a miss if the push rod drops out.