| April/May 2000

Stationary Engine


The ATIS Stationary Engine Mailing List is an on-line, on-going, worldwide engine discussion. Each month, one of the subjects of discussion is taken by an English woman and turned into an article for GEM. It is checked for technical content by a Texan, all via the internet. The advice comes from a variety of levels of experience and so gives interesting diversity to the methods of tackling the problem, which this month is on the subject of a damaged crankshaft:

The flywheels on my engine were loose at one time and damage has been done to the crank as well to the inside of the flywheels, of course. Along with a good bit of normal wear and some rust (it sat outside) on the crank-bearing surfaces, the crankshaft doesn't look very good. Been thinking, why not make a new crankshaft? Rebore the flywheel hubs, oversize, then create the crankshaft to fit those hubs, which are split hubs. Has anyone had experience making a crankshaft? Sounds like a lot of trouble and expense, but I think it may be worth some trouble.

I would be willing to bet that you could grind the crank down ?' and still have PLENTY of 'meat' to run your engine safely! These old engines were 'overbuilt' if nothing else!

Why not just grind the crankshaft and pour new bearings? The flywheel problem could be solved by enlarging the center hole and using a spacer. The spacer could even be welded to the crank and then machined to size. This sounds simpler than building a crank to me!

Above would be my first choice of a fix. Try Loc-tite on the flywheel before getting too involved. Certainly building a crank would be a fun challenge.