super m timing

All fire crater pistons need a smaller(retarded) timing advance as well as stiffer springs. So you need to replace the distributor shaft which is 30 degrees advance with a 22degree advance shaft and use governor spring package 372785R91(or next best spring package as many of the packages IH is not producing anymore). I use engine tune-up specification manual GSS-1356 for my work on rebuilding distributors.

For firecrater pistons,yes. Most fire crater piston packages use the 22degree advance shaft and 362725R91 spring package regardless of the original timing or differences in engine size. Original H/M's had 40degree advances and spring packages358106R91. As the newer more powerful tractors came out they started to shorten the timing advances, for instance the supers H/M have 30degree and 300/400 series went to 22 and 25 degree timing with various spring packages.

As far as the spring packages go I can get most of the sring numbers I need though I.H. There are however some which have been dropped, for instance the L.P. spring assy's for the 4-6 cyl distributors. Some numbers I have stock ordered and cleaned out the last of their inventory. I have had to just use the next closest sring package by sight estimation.

Any questions post me back!

My '53 Super M also has firecraters and it likes to diesel when killed. However by setting the low idle as low as possible (425 RPM) and letting the motor run at low idle for a minute or so before shutting down, it always stops immediately.

For what it is worth:

1. Retarded ignition timing will make any engine run hot(er).

2. Timing has absolutely nothing to do with "run on", "after-run" or "dieseling" as I like to call it.

Think about it: when you shut that ignition switch off, there is no more ignition timing; you've just killed it.

So, all that remains is just a hot spinning engine and that fuel, which is still coming in as long as the engine continues to rotate.

Slow your idle speed down and she'll die for you as it should.

Tryin' to help,

Allan