Letters and Miscellanies

By Staff

I was enjoying the June 2006 issue of GEM when I
happened upon mention of my name in the article regarding
“Mysteries Continued,” and the saga of the APLCO, Gray and Termaat
& Monahan. Data was mentioned, supposedly on my website,
regarding serial number “breakdown” for Gray engines, (in regards
to the number “14H29” on the ALPCO) stating that my web pages
indicate the 1 is for one horsepower, the 4 is for 4-cycle and the
H29 is the serial number. For starters, the 14H29 is a casting
number, not a serial number, and therefore, to the best of my
knowledge, has nothing to do with horsepower and cycle

Most all serial numbers found on Gray or T&M engines are
stamped on the cylinder head edge, at about the 1 o’clock

Examples of some of these serial numbers are: 35234:
This serial number breaks down as being a 2-1/2 HP, 4-cycle engine,
with the serial number 523; 411914: 4 HP, 4-cycle, serial
no. 1191; 4G2895: 4 HP, Model G, serial no. 2895;
2.5G3680: 2-1/2 HP, Model G, serial no. 3680.

I would dare to guess that the first two serial number examples
are from Gray engines made by T&M, and the later, Gray engines
made by Gray. I hope this clears things up somewhat.

Regarding the APLCO and OshKosh engines, I know nothing of their
connection to T&M or Gray. I would love to know more, and of
course I’m curious about the serial number of the APLCO in the

I think it would be a great public service to make it known that
the Gray and Termaat serial numbers, if found, are on the edge of
the head, and that the number on the hopper is a casting number. A
lot of people have queried me regarding where to find the serial
numbers on their Gray engines, as they’re hard to find, often
corroded, or painted over heavily. Thanks for the great

Tom Green
Remer, Minn.

Gray Motor Co. Stationary website:

Editor’s note: While the originally printed material on
serial numbers was found on Tom’s website, it was a copy of a post
from www.smokstak.com We apologize for any confusion.

Gas Engine Magazine
Gas Engine Magazine
Preserving the History of Internal Combustion Engines