Ford Engines

Most Ford engines from the 1930's didn't have an engine serial number actually on the block, it was usually on the clutch housing. This idea was Henry Ford's, this was to enable an engine change without having to update the log book.
On early Ford 11 and 12 cabs the engine number was also the vehicle serial number which was found on the left chassis under the left door.
Later 12 cab vehicles were issued with a separate vehicle number indicated on the plate next to the instrument panel.
13 cab vehicles from 1942 , the plate is on top of the instrument panel.
All Australian vehicles had common vehicle and engine serial numbers found near the right hand engine mounting.

CMP Ford vehicles were fitted with USA and Canadian built engines.
The Canadian sourced engines had a 'G' prefix and an 'F' suffix.

An example of a Canadian Ford engine number is : 4G - 16180 - F
The '4' indicates 1943. ( 1 is 1940, 2 is 1941, 3 is 1942, 5 is 1944 etc )
'G' indicates Mercury 32.5 h.p. with 4-speed box.
'F' indicates Right-Hand drive export.
'16180' is the actual serial.

1G models ran from 1G-175 to 1G-11500 spanning Nov 1 1939 to Oct 1 1940.
2G models ran from 2G-205 to 2G-48148 spanning Oct 1 1940 to Nov 1 1941.
Records are unclear from therafter.

11 and 12 cab Ford engines had the ignition coil built into the distributor and is often refered to as the Diver's Helmet due to it's resemblance.Early 13 cab engines had a separate coil and the distributor had 4 ignition leads emerging from either side and resembled a 'Crab'. Later 13 cabs had a more conventional cap with all 8 leads emerging in line.

As with all series production especially during wartime there were exceptions to all rules and sometimes in order to keep up production superceded parts were often re-used on the lines. Change over points were rarely straight forward or as recorded.

If you know of any obvious discrepancies we would be pleased to hear about them.

Chevrolet Engines

Chevrolet CMP vehicles had different engine and vehicle serial numbers and were usually indicated by a plate on the instrument panel. Chevrolet 216 cu.in engines had a 2 letter prefix to the engine serial number.
The 2nd letter was usually an 'R' to indicate Right-Hand drive.
The 1st letter indicated the production date.

From 1938 through to 1940, truck engines had a 'T' 1st letter prefix, light commercial trucks had 'K' and some CMP trucks also used 'T' with 'R' for RHD. Australian exports had 'TRA'. 'AR' was used for 1940, 'WR' for 1940-1943, 'ZR' in 1941, 'XR' in 1941 ( FATs ) and at the end of CMP production, 'SR' in 1942, 'PR' from 1942-1944, and 'FR' from 1942-1944. 'X' was used post-war with GMC trucks.1945 models usually carried a 1944 code.
On early vehicle data plates there was a 'Trim' section, in commercial use this was an obvious meaning, but in CMP vehicles this usually carried the engine prefix, e.g. 'ZR'.

The Chevrolet vehicle serial number usually consisted of 10 digits e.g. 2844031029.
The 1st digit '2' was the year code i.e. 1942.
Digits 2,3,4 and 5 were the vehicle code i.e. 8440 which was a CGT ( see chassis codes for a detailed explanation. )
The last 5 didits were the actual serial i.e. number 31029.

As with the Ford engines above there were exceptions due to production difficulties.