23
MAN-88 – UK
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 any
150lt
, or before whenever the clearance
between piston and cylinder exceeds
0.12mm
.
The prescribed clearance between cylinder and new piston, is
0.07mm
.
The effective piston diameter has to be verified at
15mm
from the base, perpendicularly
to the piston pin.
Size of the liner to be matched with piston is marked on top of piston with a green or
red dot or with letter
V
or
R
.
If the size on piston top is marked with:
- a
GREEN
dot or letter
V
; the size marked on the piston matches with liner.
- a
RED
dot or letter
R
; add 0.01mm to size marked on the piston to match the liner size.
Moreover, the clearance between the piston ring tips (installed in the cylinder) must be
between
0.10÷0.15 mm
. The clearance can be checked with a feeler gauge, by inserting
the ring in the cylinder
CONROD SMALL END CAGE
