Assembling a Lauson TLM

The Lauson TLM is a close relative to the Lauson TLC. The engine is built to be an air cooled, inboard marine propulsion unit for a small boat (probably 16 to 20 foot range). My literature states that Lauson built these engines with forward / reverse transmissions and I have seen TLM engines with at least two different types of transmissions; few of the transmissions have survived however. The engines themselves are not particularly prevalent, and finding one complete with it’s transmission is a rarity. In their later years many of these engines were removed from the boat that they originally propelled and were re-tasked to other purposes where a marine transmission was probably a nuisance, as I suspect was the lot of this particular engine. The engine differs from the TLC in that it has a deeper sump, no governor, and is built to be run on a slight angle to facilitate connection to the stuffing box and propeller drive shaft of a boat. The engine was also undoubtedly originally equipped with a spark arrestor air cleaner, long gone by the time I took possession of the engine. As originally supplied by the factory, this engine might have been equipped with a coupling for a flexible exhaust pipe, which might have been routed under water for noise reduction.

This engine came to me as a well preserved, running specimen and my initial intent was to just remove the grease and grime from it and leave it “original”. I pulled the oil sump (a standard procedure I do for ALL my engines) and proceeded with the clean-up. Much to my chagrin, my de-greasing efforts also removed all the old paint from the magneto plate. At this point, my choice was to either re-paint just the magneto plate or the entire engine. My preference was the latter.

The original color of this engine was black- top to bottom. I just can’t seem to bring myself to paint an engine one solid color, so I’ve chosen my standard two-tone “base color with cast-coat-aluminum gas tank and head”. This also allows me to leave the carburetor and crankcase air breather as bare aluminum and pot metal. A coat of “clear coat” keeps them clean and prevents oxidation.

Though I didn't replace the bearings on this engine, I have had to on a TLC which is basically the same engine. The replacement beearings are:
PTO side: consolidated 87604
Magneto Plate site: WC87504
These should be the same bearings used for the TLC, the TLM, and the TLH

Below details the step by step renovation:

Installing the Valves
Installing the Crankshaft
Installing the Piston and Connecting Rod
Installing the Engine base and Oil Pump
Install Magneto Plate and Time Magneto
Installing the Flywheel and Blower Housing
Installing the carburetor
Installing the Gas Tank and Plumbing
1st Run

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