Try this link to the "Unoffiical Allis Chalmers Forum" : Dens71TA
http://www.allischalmers.com/forum/forum_posts.asp?TID=38167&title=allischalmers-forklift
This post on it may help you or communication with the poster may get info from his book.
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Quote Reply Posted: 03 Mar 2012 at 8:34pm
Rikker, your forklift has the Buda/AC G153 engine. I have the operator and maintenance manual for my mid-1960's F40-24 forklift which looks nearly identical to your FL40-24PS.
Tune up specs are:
Spark plug gap .025
Normal Duty Gasoline Champion No. N16Y
Heavily Loaded Gasoline Champion No. UN12Y
Normal Duty LPG Champion No. N8
Heavily Loaded LPG Champion No. N6
Distributor points gap .022
There is a screw in plug at the base of the distributor that should be removed and the oil well topped off with SAE 20 engine oil every 500 hours to keep the distributor shaft bushing lubricated.
Valve pushrod clearance should be adjusted every 500 hours. .018 cold or .015 hot.
Hope this information helps. There seems to be very little information on the internet for the old Buda/AC engines.