halftrackinfo

general discussion => ALL mechanical and technical related questions => Topic started by: cal.50 on January 01, 2021, 03:47:17 AM

Title: White or Autocar how to see the difference
Post by: cal.50 on January 01, 2021, 03:47:17 AM
Hello

I can get an M2 half track but without any data plates. How can I see if it is an white, or Autocar half track?

Thanks
Andy
Title: Re: White or Autocar how to see the difference
Post by: brit plumber on January 01, 2021, 05:39:51 AM
For me it would be serial number to start, and then perhaps details like the percentage of nuts on the armour screws being one or the other. White have a groove around the end side of the nuts and autocar/diamond T have dimples? On the ends. Of course the vehicles could be repaired/rebuilt/restored with any type of nuts so some results can vary.

Some more knowledgeable people may know other ways to distinguish manufacturer.
Title: Re: White or Autocar how to see the difference
Post by: woodwalker on January 01, 2021, 08:18:00 AM
If you can look in the engine compartment you can see the heat treat numbers  there will be a symbol
Autocar is the keystone state symbol
White is a box
Diamond T is a diamond
But armor can be swapped around so the best bet is can armor
 As Brit plumber stated look at the serial number on the frame behind drivers side tire
Title: Re: White or Autocar how to see the difference
Post by: WayOffTrack on January 01, 2021, 10:02:26 AM
Hello

I can get an M2 half track but without any data plates. How can I see if it is an white, or Autocar half track?

Thanks
Andy

The easiest way to identify which company built your halftrack is the frame serial number stamped on the drivers side frame rail. If White built will have a 6 digit serial number beginning with the number 2, such as my M2 which is 233741. The number is on the frame rail facing out behind the front tire, usually just behind the frame extensions for the roller (or winch).

If built by Autocar it will have the model number designation included in the serial number such as M2-xxxx.

Good luck,
Clint
Title: Re: White or Autocar how to see the difference
Post by: cal.50 on January 02, 2021, 03:25:23 AM
I checked the number today... it is M2a1 -112xx stamped

Is it possible to find out also when the Halftrack was built?

Thanks
Title: Re: White or Autocar how to see the difference
Post by: spec4don on January 02, 2021, 04:29:28 AM
Check the tracked forum over on the G503 there is S/N data base there.

Don G.
Title: Re: White or Autocar how to see the difference
Post by: cal.50 on January 02, 2021, 12:44:14 PM
But is it an white , Autocar or Diamond?
I cannot find this number at g503...
Title: Re: White or Autocar how to see the difference
Post by: brit plumber on January 02, 2021, 01:31:33 PM
It’s an Autocar. The serial range may not be listed if it wasn’t a US contract. Perhaps it was a British contract (pre lend lease) and paid up front, hence no USA number or Purchase order. Here are some from the g503 list.

M2A1-11246------------------------------------------------M2A1-------------------Germany----Fndr hdlps (Hohenfels) ret'd to Ft. Sill ADA Museum
M2A1-11252------------------------------------------------M2A1--------------------Belgium----Winch-Fndr hdlps.
M2A1-11416------------------------------------------------M2A1-----------------Netherlands--Winch-Pedestal hdlps.

Title: Re: White or Autocar how to see the difference
Post by: WayOffTrack on January 03, 2021, 11:04:17 AM
Autocar factory build M2A1 so it always had a pulpit and perimeter rail and never a skate rail. For historical reference Diamond T did not build any M2's or M2A1's.
Title: Re: White or Autocar how to see the difference
Post by: cal.50 on January 03, 2021, 12:56:07 PM
Thanks to everyone, great to get this infos from you guys.

Does somebody know how many Autocar M2a1 were built?

Title: Re: White or Autocar how to see the difference
Post by: Smadge on January 03, 2021, 06:09:21 PM
Autocar factory build M2A1 so it always had a pulpit and perimeter rail and never a skate rail. For historical reference Diamond T did not build any M2's or M2A1's.
I have an M2 Autocar which was later converted to an M2A1.  If you check the G you'll see the first Army contract was with Autocar for M2's.

Paul
Title: Re: White or Autocar how to see the difference
Post by: Cleprechaun on March 16, 2021, 12:59:51 AM
I figured the date and make of mine by using the model type, headlights (pedestal or fender), font and serial number range, and one of my halftrack books that showed the amount of each type of halftrack made. I came up with a 1943 Autocar m15A1. Later, when I basically acid bathed the batter box, I found an inspectors mark etched into the metal dated Feb 43.
Title: Re: White or Autocar how to see the difference
Post by: brit plumber on March 16, 2021, 03:57:39 PM
Going back to the post above about the marks on the armour. My M16 Armour has a Diamond symbol which would be diamond T, except M16s were only made by Whites.