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You could try adding 1 more black shim to #3 and #4 and see if that changes the sound by delaying the injection point a few degrees. I would not change the rotational position of your temps are pretty consistent. All that does is vary the amount of fuel delivered with each pulse. A trick to help...

Good work! God what I wouldn't give for an 80 hour 803 these days.... a lot more than $750 that's for sure!

Sounds like someone may have owned stocks in the shim company! That's a whole lot of shims to be in one machine. I've never even seen gray shims, are those thicker than the black or somewhere in between the black and the paper thin green ones? Glad to hear that it's running ( and sounding )...

Wow, 7 shims? I think that will make that pump fire off a little late. I've had a few sets that would smoke gray/white out of 1 cly. until it warmed up. They had probably 4 or 5 shims , removing a couple shims ( leaving 2 in place ) fixed most of them.

I usually measure the underside angle of where the exhaust port casting sticks out of the head, just be careful as the fan can play tricks on you, making temps seem lower at the front of motor. Block the air for a little bit, then measure temps.

On the injectors you can remove them, open them up and clean or replace the nozzles and pintles but that's about it. The pressure is adjusted using tiny shims under the springs and you need a pop tester, so not the easiest job. To disassemble just unscrew the 12pt. cap on the end. Keep track of...

I agree, verify barb distance from push rod tubes is about equal first. When taking the temps it is very difficult to get accurate measurements because the fan tends to cool the front of the engine much faster than the back cylinder, which is also what your temp readings are showing. Try...

Looks like the subsequent posts have you moving in the right direction. I'll throw Uniquify's post into this thread too.... for future searchers to find metering pump pictures more easily! https://steelsoldiers.com/threads/mep-803a-motor-locking-up-at-0-and-180deg.192351/page-2#post-2259257

Ha! I'm late because I was tied up working.... ;) Anyway, I'm better with the 002/003 pumps than 802/803 but from what I recall you take the top nut off ( the one under the line nut ) and the guts are mostly accessible through the top. The clip on the bottom "unhooks" off the plunger ( spring...