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Engine identification help


Afterburn
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Sure looks like a Willys 4, especially the water outlet in the center of the head.  That engine first appeared in the Whippet, circa 1927-28, and was extensively modified in the late 1930s.  Engine number bears no resemblance to those listed in my 1935-46 MoToR Manual, nor is it like the U-nnnnn number on my 1948 Jeepster.  The 2-stage regulator suggests approximately 1935-1940, but the generator-regulator assembly could have been replaced over the years.  The casting number on the cylinder head, 630307W1, (esp. the six-digit 630 part of it) suggests immediate pre-WW2 period--the post-war Jeepster head was 640161.

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On 2/26/2022 at 12:22 PM, Afterburn said:

Grimy, does the first two digits to the engine block S/N indicate the year it was made?

Engine number ranges from 1935-1946 MoToR Manual (almost all are same as car serial number):

1935 model 77 27056-47749

1936 model 77 47750-66001

1937 model 37 1001-64467 (anomaly time:  Model 37, previously 77; and they did NOT sell 63,000 cars that year)

1938 model 38 65001-89000

1939 model 48 89001-94375

1939 model 39 Overland Four 1001-16214

  all 1935-1939 had 100" wheelbase

1940 model 440 440-17001-49341, 102" wb

1941 Americar Four 50001-80099, 104" wb

1942 Americar Four 80301-92020

1946 (no listings of serial/engine numbers)

 

My best guess is that it is indeed 1937 but with restamped number or replacement block.  The suffix "C" supports the factory rebuilt or replacement block theory.  And the sequential number falls within the range for 1937.

 

The road draft tube on the left side means it's pre-WW2, because the postwar versions like my Jeepster actually had a Positive Crankcase Ventilation (PCV) valve in lieu of a road draft tube.  And the grease cup on the water pump also indicates pre-WW2.

 

The block casting number (630307W1) is earlier than my 1948 (641145).

 

Hope this helps!

Edited by Grimy
fix typo (see edit history)
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On 2/26/2022 at 7:25 PM, Grimy said:

Engine number ranges from 1935-1946 MoToR Manual (almost all are same as car serial number):

1935 model 77 27056-47749

1936 model 77 47750-66001

1937 model 37 1001-64467 (anomaly time:  Model 37, previously 77; and they did NOT sell 63,000 cars that year)

1938 model 38 65001-89000

1939 model 48 89001-94375

1939 model 39 Overland Four 1001-16214

  all 1935-1939 had 100" wheelbase

1940 model 440 440-17001-49341, 102" wb

1941 Americar Four 50001-80099, 104" wb

1942 Americar Four 80301-92020

1946 (no listings of serial/engine numbers)

 

My best guess is that it is indeed 1937 but with restamped number or replacement block.  The suffix "C" supports the factory rebuilt or replacement block theory.  And the sequential number falls within the range for 1937.

 

The road draft tube on the left side means it's pre-WW2, because the postwar versions like my Jeepster actually had a Positive Crankcase Ventilation (PCV) valve in lieu of a road draft tube.  And the grease cup on the water pump also indicates pre-WW2.

 

The block casting number (630307W1) is later than my 1948 (641145).

 

Hope this helps!

Thank you very much Grimy. That's a big help.

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