rack setting fixture 1M6953 is 1" longer than the newer 8M0530 but ???????

I found this older thread...www.acmoc.org/bb/archive/index.php/t-659.html
where I was asking about checking the rack setting. The TM says to use the 1M6953 rack setting gauge (appears to be a special bushing) and a depth mic set at 1" to zero the rack before installing a pump into the housing. Eddie B said that the specs he had said to subtract 1" if using the 8M0530 tool instead of the 1M6953 bushing and a depth mic. Does anyone know how the 8M0530 tooling indexes on the pump housing? Does it sit flush on the face or does it fit into the hole there a little?

Another diagram shows the center tooth of the pump plunger gear quadrant matching up with the 4th or center notch of the rack. I haven't looked into the housing on the D320, but I assume I can just use that information to get the pumps back in correctly? I don't really have to check the setting, just center the rack to install the pump.

Got the 922b started on diesel today and the rack is stuck, turbo is most likely stuck too because it smokes like a steam engine and the "run away" took a while to build up rpm. Luckily I had planned ahead and had a chunk of mining conveyor rubber belting handy to smother it with. I ran it a few minutes controlling the rpm with the air inlet into the air filter housing but it never started governing. I took the cover off over the end of the rack and it moves slightly but just, so I am going to assume it is stuck.

When I started in on the fuel system i discovered the failed repair of an old crack in the fuel filter housing was preventing priming the fuel system. When I opened the housing to remove the filter before attempting more repairs, there WAS no filter! In addition while the filter housing was off I found quite a bit of sediment and debris in the pump housing fuel gallery. Wonder where that came from? Ha! I cleaned this away and flushed it out but probably just broke some of it loose that is now in the pumps and causing them to stick.

So a disassembly and cleanout is in the cards for this injection pump. I have the 1M6952 wrench or its replacement on the way from Regal corp in Tennessee, so I can remove the hold down rings and I think I can take an old injection line to screw on as an extractor handle to pull and replace them. Hoping for the best!

I appreciate any advice.

I have had good luck in the past using ATF in the governor on detroit and cats. fill or splash liberal amounts of atf on the governor and slowly ant gently cycle everything untill it begins to free up. also check and make sure those mud wasps haven't built a bunch of nests in your exhaust and intake or on the compressor side of the turbo. "Don't ask how i know"!!😞

This info ought to help...
The 8M530 has been replaced by a 7S7113 Rack Setting Gauge

Hi Team,
hope this scan is a bit better.
Have tried to get a clearer and larger scan but my meager skills on computers does not seem to be up to the task.
I seem to recall the tool we had was more the shape as is the Spacer "G" shown in one of the scans is representative of the shape needed. Either shape would work--your choice.
The spacer should be a close fit into the timing case hole and have a machined out drilling for the depth mic rod from the outside face, a suitable clearance hole is drilled in from the inner face to give clearance to allow the rack to protrude into without interference.
The step on the outer circumference that inserts into the timing case should be long enough so that the tool seats on the front face of the injection pump body and have clearance back to the timing case so the spacer does not seat on the timing case 2 bolt cover plate face or false readings would occur due to machining tolerances of the case and associated gaskets.
As stated the overall length of the spacer is 1".

Hope this helps.
Cheers,
Eddie B.