Hi Tseaberg, I have a MH Type 1 20 hp engine, large and heavy ( 2tonnes plus) . I have tried to find a serial number and the pin holes where the plate may have been fixed without success. I believe the very early small engines had no serial numbers. It is a"pig" to start. There is a small handle which folds away into the flywheel, suitable for the smaller engines but certainly not this monster. To start I couple the flywheel with a belt to the tractor, the engine fires up after getting it over the first compression and runs as new. I bought the engine at the Domevalley Museum auction, built between 1902 - 1904 and used to pump water in the Sacramento Delta California. Can you confirm the build date?
With the the condition of the engine I don't think it pumped a gallon of water, surmise the operators were unable to start it. The engine part numbers. ----
Main brgs (2) AA264
Flywheels (2) AA269. ( 42" dia.)
Crankcase cover. AA271
exhaust Rocker arm. AA270. (45" long)
Connecting Rod AA268
Piston. 10" dia. Stroke. 10"
There is gear wheel (17" dia. with 32 teeth) fixed to the inside of RHS flywheel Nothing was ever matched up the gear as there are no signs of wear.
Any further information will be appreciated