- Calculate the piston pin coupling clearance.
N.B.
THE PIN HOUSINGS HAVE 2 LUBRICATION CHANNELS.
FOR THIS REASON, MEASUREMENT MUST BE MADE AC-
CORDING TO THE PISTON AXIS.
Characteristic
Standard clearance:
0.001 ÷ 0.010 mm
Inspecting the piston
- Carefully clean the seal housings.
- Measure the coupling clearance between the
seal rings and the grooves using suitable sensors,
as shown in the diagram.
- If the clearance is greater than that indicated in
the table, replace the piston.
N.B.
MEASURE THE CLEARANCE BY INSERTING THE BLADE
OF THE FEELER THICKNESS GAUGE FROM THE SECOND
SEAL SIDE.
Fitting clearance (Cylindrin/Pison)
Standard coupling clearance A 0.9 - 0.005 -0.030mm B 1.5 - 0.005 -0.03mm Maximum permissible
clearance after use C 0.9 + 0.03 +0.01mm D 2 + 0.05 +0.02mm Standard coupling clearance </>
1.2 - 0.005 mm </> </> Maximum permissible clearance after use </> 1.25 + 0.03 mm </> </>
Standard coupling clearance </> 2.5 - 0.005 mm </> </> Maximum permissible clearance after
use </> 2.5 + 0.03 mm </> </>
- Measure the outside diameter of the piston, per-
pendicular to the gudgeon pin axis.
- Take the measurement in the position shown in
the figure.
Characteristic
A =
43.2 mm
Piston diameter:
92 mm
X9 Evolution 500 Engine
ENG - 147
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