MAN-79
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
.
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 60lts, or
before whenever the clearance between piston and cylinder exceeds 0.17mm.
For NOT competitive use the replacement must take place any 90lts of mixture or
whenever the clearance between piston and cylinder exceeds 0.17mm.
The prescribed clearance between cylinder and new piston, by selection GREEN, is
0.13÷0.14mm
.
The prescribed clearance between cylinder and new piston, by selection RED, is
0.14÷0.15mm
.
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.
8
