MAN-78
MAIN ENGINE COMPONENTS AVERAGE
ESTIMATED LIFE
The estimated life of the different components, of the engine, changes according
to the use and to the desired performance
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PISTON / CYLINDER MATCHING
The piston replacement must take place within specific intervals, measured through
used mixture liters and it changes depending of the engine use, if for competitive
use (so to reach the better performance) or not competitive.
IAME suggests to replace the piston during the competitive use any 100lt, or
before whenever the clearance between piston and cylinder exceeds 0.15mm.
For NOT competitive use the replacement must take place any 150 liters of
mixture or whenever the clearance between piston and cylinder exceeds 0.15mm.
Every 50 liters inspection process is recommended to check the state of the piston
of the piston itself.
The prescribed clearance between cylinder and new piston, is 0.12mm.
The effective piston diameter has to be verified at 18mm from the base,
perpendicularly to the piston pin.
The measure marked on the piston top is the effective one of the piston.
Moreover, the clearance between the piston ring tips (installed in the cylinder)
must be between 0.40÷0.45 mm.
The clearance can be checked with a feeler gauge, by inserting the ring in the
cylinder.
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