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Ok,,this was a Z-134? engine I was working on in a small forklift, same as a 135 MF basically. As I recall, it is a similiar design to yours, OK, what happenned was it blew up the distributor, just as you described, and as it is quite old with a lot of hours we just assumed it let go due to age, so we patched it up and away it went, for about 3 days, then it did it again, so we dropped in a used unit, surprise, couple days later, same thing. Upon teardown what I found was the cam gear had been overtightened. The cam is rifle drilled on the end (hollow) for the shaft for the governor to sit in, and when over tightened, the threaded end broke off the shaft. Since the cam gear provides end float control for the cam it allowed to cam to walk back and forth lengthwise, putting a lot of stress on the distributor and gear and most likely allowing the timing to change a lot as well. Hope this helps,,maybe you can remove the distributor, carefully noting where the rotor points to for reassembly, and WITHOUT rotating the engine with the distributor out try prying the cam forward and rearward with a screwdriver? Lots of luck,,Greg,,and I noticed, I was a bit longwinded here
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