It means that all clearances are checked and corrected as needed to keep them all as close to tolerance as possible. It ensures that the engine is assembled to strict tolerances. This can and usually includes: main and rod bearing clearances, cam bearings, piston to wall, deck height, piston ring gap, combustion chamber cc...and so on.
its mean engine maitenance
the engine size
If you mean aircraft ( a GLIDER has no engine )
the engine is running
A bad engine rod is an engine rod that has misbeheaved.
Yes, if you mean a "Wankel" engine, also called a "Rotary" engine.
When your engine has a knocking noise, it could mean that a rod has been thrown. It could also mean you are low on oil.
it is a old time gas Engine.
would like to help but what do you mean by " folding " your engine ?
the engine is flooded with gas
it means a 2.3 litre engine
It was considered to be the First modern Engine. By modern Engine, they mean the first four-stroke engine.