Joined: Aug 13, 2008 Posts: 86 Location: Bloomfield Twp., Michigan
Posted: Fri Dec 21, 2018 2:00 pm Post subject: Setting Timing
I want to set the timing on my M38. I have no timing light, so I'll need to get one. How does one set the timing on a 24 volt system? All of the lights I see for sale are 12v. Plus, what effect does the metal braiding have on the function of the timing light? Are there lights with connectors to the waterproof plugs? Or, is there a light made for M series motors? Lastly, is it wise to advance the timing more than the 5 degree mark? Say, 8 degrees? I'm in a bit over my head here. I'm also on a budget.
The shortest answer:
The same way one sets it on a 12 or 6 volt system using the same type distributor arrangement.
The second shortest anaswer:
Read the Par 142 on pages 176 thru 181 of the M38's Operator Manual TM 9-8012.
All of the lights I see for sale are 12v.
You connect the 12V timing lights black ground clip to the engine's bare metal. You then connect the 12V timing light's red + clip to the underhood battery's + terminal. This terminal will read 12 V's.
Plus, what effect does the metal braiding have on the function of the timing light? Are there lights with connectors to the waterproof plugs? Or, is there a light made for M series motors?
I don't use a timing light on any of my vehicles regardless of voltage. I static time them and they will start; then fine tune the timing using your ear, and a vacuum gauge. This method works. As far as timing too advanced, you will find out immediately when you drive it as it will ping badly, overheat, and be hard to start, especially on a 6 volt system. _________________ M38 23100 June 1951
Willys MB 1944
Ford GPW 1942
Dodge WC63 1943
Dodge Power Wagon WM300 1967 (Not Military)
Plymouth Barracuda, 1973, 340 4 barrel (Army staff car) Not.
All ground up restored by me.
Lots of others over the years.
For the newby timing by ear or vacuum gauge is a learned technigue and stumbling thru it will lead to advancing your timing too far and causing damage.
Having taken part in training on the job dozens of new mechanics since the beginnings of my own career in 1966 I always made sure the newby FIRST learned the Correct Method then I would teach them the shortcuts. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
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