When an engine is misfiring or overheating.
When an engine is knocking too badly to continue working or is not pulling.
When carburation is bad.
When a Tank is at such an angle that it is dangerous to run the engine.
The causes of engine failures and how to correct them.
How the autovac works.
The correct tension for fan belts.
When an engine bed is loose.
How much petrol, oil, grease, and water should be used during average hour’s run.
When road chain sprocket wheels or pinions should be changed.