6A–30 ENGINE MECHANICAL
Rocker arm roller and rocker arm pin
1. Pass a piece of string between the rocker arm and
the rocker arm roller.
2. Pull on either end of the string in the directions
shown in the illustration.
3. Measure the rocker arm protrusion (1).
4. Mark the measuring point and remove the string.
5. Press the rocker arm roller against the rocker arm
with your fingers. Measure the rocker arm protrusion
again.
6. Calculate the difference between the 2 protrusions
(roller out and roller in). This is the roller and pin
clearance.
If the clearance exceeds the limit, the rocker arm must
be replaced.
Rocker arm roller and pin clearance
Standard: 0.068 – 0.099 mm (0.0027 – 0.0039 in)
Limit: 0.5 mm (0.002 in)
7. Check the rocker arm roller and camshaft contact
surfaces for excessive wear and damage.
Rocker arm bracket
Check that the oil hole in the rocker arm shaft bracket is
free of obstructions.
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