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Were this true, the above serial number might represent the year 1953.
I can not begin to tell you how to accurately date an over head valve Lauson or an engine from the 1st generation design period.
I do not claim the chart to be entirely accurate, from time to time I uncover information that may allow me to tweak these dates a bit.
It really is a best guess based upon the current information at my disposal.
Unfortunately, there is little concrete information that helps us absolutely date a Lauson engine.
Always make sure that drain oil is disposed of properly.
On units that the drain plug is accessible, remove the plug and allow the oil to drain into a proper receptacle.
Reformulated fuels containing no more than 10% Ethanol, 15% MTBE, 15% ETBE or premium gasoline can bu used if unleaded regular gasoline is not available.
Unleaded gasoline burns cleaner, extends engine life and promotes better starting by reducing combustion chamber deposits.
Using model LEV115-57010B, serial 8105C as an example, interpretation is as follows: New short blocks are identified by a tag marked S.