Valve Clearance Adjustment - Malossi 5919140 Manual Del Usuario

meticulously the procedure
indicated above.

Valve Clearance Adjustment

The valve clearance adjustment
must be performed with a cold
engine (i.e. ambient temperature).
Verify that the engine is at top
dead centre of the compression
Fig.
stroke of cylinder No.1
and the camshafts are oriented
as in Fig. 2, check and/or adjust
the valve clearances. The correct
valve clearances are indicated in
the "Assembly Data" section.
To check that the piston is truly
at TDC, verify that the intake
camshaft's timing mark c
the exhaust camshaft's timing
mark d are aligned with the
cylinder head's mating surface
as illustrated in Fig. 2. A feeler
gauge is needed to measure the
valve clearances.
• Measure the valve clearances
for cylinder No. 1
• Rotate the engine 360°.
• Measure the valve clearances
for cylinder No. 2
• Calculate the difference
between the measured
1,
clearance and the clearance
indicated in the "Assembly
Data" section.
Example
• Indicated valve clearance =
0.15-0.22 mm
• Measured valve clearance =
0.30 mm
and
• 0.30 mm – 0.22 mm = 0.08 mm
• The valve shim size is stamped
on the side that contacts the
shim bucket in hundredths
of mm.
Example
• If the size is "155", then the
• Calculate the sum of the
(Fig. 5).
(Fig. 5).
Example
• 1.55 mm + 0.08 mm = 1.63
• Round off this size according
Last Digit
0 , 1 , 2
3 , 4 , 5 , 6
7 , 8 , 9
• Refer to the following table for
10
thickness is 1.55 mm (0.061 in)
valve shim thickness plus the
difference determined above.
mm -> Therefore, the required
valve shim size is 163.
to the table below and
select the new valve shim
size accordingly.
Last Digit
Rounded
0
5
10
available valve shims.