Engine Casting Number for 1941 WF

I have a 1941 WF that needs an engine and block replacement.  Someone thought that antifreeze was too costly and you know the result.  I would like to keep the tractor so the engine casting number is consistent with the tractor serial number.  The last two digits on the engine casting number are -28.  I understand there is an earlier block with a casting number with the last two digits of -26.  The casting number is behind the magneto.  Does anyone know what the correct block (-26 or -28) is for this year of WF?  Likely, the WC would be the same.  Thanks.

Dr. Allis your comment is right.  Trouble is that the engine serial number was ground off when the freeze break was repaired with a large patch over the break.  I'm hoping that someone has a 1941 WC that they know has the original engine.  The casting number on that engine should provide my answer.  Thanks.

i have an early styled wc for parts.  I can check and get back with you on the engine # if its a 41 or close

Farrell. Checked my wc. Serial # 95383 which is early to mid 1940. Block serial is w99854g and casting is clearly 03019-23.
Dont know if that helps any or not

Cal, Thanks very much that is what I wanted to know.  My gosh, looks like Allis had another casting number lower than the -26.  Devoid of other options, guess I will go with the -26 casting number unless other information comes into focus.  Thanks to all of you that posted on this question.  It was all very helpful. 

I have a parts WC I couldn't read the complete s/n but its a late 41 or 42 and it has a -25 block in it.  

Casting numbers could vary from year to year . It is also possible 2 or more casting numbers were used in one years production. Here is a list of engine serial numbers for different tractor numbers by year. This is for the WC, but engine serial numbers would be in the same range for the WF by year of production.

Approximate engine sn based on tractor sn:

Year	Tractor SN Range	Engine SN Range
1933	1 - 28	(inconclusive)
1934	29 - 3126	(inconclusive)
1935	3127 - 13869	(inconclusive) - 14083
1936	13870 - 31783	14084 - 32696
1937	31784 - 60789	32697 - 62833
1938	60790 - 74329	62834 - 74893
1938	74330 - 75215	74894 - 75927
1939	75216 - 91533	75928 - 94965
1940	91534 - 103516	94965 - 108945
1941	103517 - 114533	108946 - 121799
1942	114534 - 123170	121800 - 131875
1943	123171 - 127641	131876 - 137092
1944	127642 - 134623	137093 - 145238
1945	134624 - 148090	145239 - 160950
1946	148091 - 152844	160951 - 166496
1947	152845 - 170173	166497 - 186714
1948	170174 - 178202	186715 - 196081

Edited by CTuckerNWIL - 05 Jan 2017 at 8:02pm

Bryan Smiths website.

http://wsmth.people.clemson.edu/

The engine s/n's do NOT line up exactly with the chassis s/n's. There were always more engines produced than tractors, for water pumps, power units, etc.

The chart has two rows for 1938 - separated when the WC changed to the styled sheet metal.  1938 blocks inclusive would be 62834 - 75927.  Since my WF block was cast in March it fits nicely in the first range.  My block is W69256HA, which is the first engine number I have seen with an HA suffix.

TomMN wrote: The chart has two rows for 1938 - separated when the WC changed to the styled sheet metal.  1938 blocks inclusive would be 62834 - 75927.  Since my WF block was cast in March it fits nicely in the first range.  My block is W69256HA, which is the first engine number I have seen with an HA suffix.

I have been taking note of casting numbers on WC, WF, and WD engine blocks for a while,  Not that it is a definitive study since the data is fairly limited, there is a pattern emerging though.  I thought I'd share it for what it's worth.
http://allis01.com/fossto/AC-WC-Engine-Data.html

Thanks for the information on the HA suffix, I hadn't heard that before.


Edited by TomMN - 08 Jan 2017 at 8:29am

Thanks, I hope it's OK I added yours to the chart.