Excerpt from The Practical Gas and Oil Engine Handbook: A Manual of Useful Information on the Care, Maintenance and Repair of Gas and Oil Engines, With Special Reference to the Diesel Oil Engine
Actual Horsepower. The expression actual horsepower is equivalent to brake horsepower and is used to designate the power which an engine develops at the driving pulley.
The actual or brake horsepower of an engine is obtained by means of a Prony brake or a dynamometer which gives the actual work or performance of the engine in foot-pounds for any given length of time.
Adjustment. Adjusting the parts of a gas engine is not generally as well understood as it might be. It pays to take time and do the work properly, then it will not be necessary to tinker with one part or another.
When main bearings are loose, the balance wheel will deflect as shown by the dotted lines J J, which is a sure indication that bearings on the crank shaft are too loose and allow it to spring at every explosion. This play around the crank shaft is shown at N in Figure 1, p. 10. The bearings have come loose, and sometimes the result will be a broken shaft.
A crank bearing can be run very close if it is properly set up and all bolts firm, otherwise it will run hot quickly.
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