Military-Vehicles: [MV] M37 Timing

[MV] M37 Timing
Mon, 13 Oct 1997 17:21:51 -0400 (EDT)

I recently got around to checking and setting the timing on my '52 M37.
Although I try not to make it a habit, I read the TM first. The TM explains
that under normal conditions, the timing should be set at 2 after TDC.
However, in extremely high or extremely low altitudes, the timing may be
adjusted to occur anywhere between 2 before or 6 after TDC. Under no
conditions should these limits be exceeded.

I live just outside of Denver, Colorado. When the truck is sitting in the
garage, it is at an elevation of approximately 5,280 feet. Then, going into
the mountain passes, you can easily reach altitudes over 12,000 feet.

When I adjusted my timing, I found that the further I advanced it, the better
it ran. By advancing the timing as far as possible by hand, I set the timing
and measured it with a timing light to be 4 before TDC.

Is this OK? (The manual says clearly, not to go past 2 before TDC.)

Also, I have heard that you should advance your timing 1 for each 1,000 feet
in elevation. Is there a limit to this rule? If I go up to 12,000 feet, can
I advance the timing to 10 before TDC(2 after TDC + 12 = 10 before TDC)?

Rob Kiser
'52 M37

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