TheMODEL M was built only as a delivery vehicle. It was the same as the 1907 delivery except that prices now included two oil side lamps, an oil tail lamp, and a bulb horn. Headlamps were not included as standard equipment on Cadillacs until 1910. Also it did not have the longer wheelbase or running boards found on the Model S or Model T.
I. D. DATA
Serial number locations
Serial numbers on plate on rear of body (with engine number)
Engine numbers were stamped two places on crankcase:
Top, right edge of cylinder flange, near water outlet.
Top surface of left, front mounting leg.
Also on plate on rear of body (with serial number).
(Blank spaces on patent plate are for additional patent dates, not engine or serial number.)
24075-24350 with K, S. T (1907)
Horizontal, with cylinder to rear. One cylinder. Cast iron cylinder, with copper water jacket
127mm x 127mm
“Higher than advertised or calculated”
Updraft mixer manufactured by Cadillac
30 x 3-1/2
2 Forward (3:1 and 1:1), Reverse (3:1)
Low (foot pedal), reverse & high (lever to the right)
3.1:1 to 5:1
Mechanical brakes on two wheels; contracting on inboard drums
Wood wheels, 12 spokes
Touring & Roadster Wheel size
Model M 23 in.
On the models M, S & T, different combinations of 9 or 10 tooth driving sprocket with 31, 34, 38, 41, or 45 tooth driven sprocket gave ten possible ratios from 3.1:1 to 5:1.
9 tooth drive sprocket
10 tooth drive sprocket
Lower ratios for runabout to be run on smooth, level roads to higher ratios for loaded Delivery to be run on rough, hilly roads.
Instructions for changing sprockets were available for owners, but the change involved disassembly of the transmission and rear axle — definitely not a “quick-change” set-up.