Checking The Camshafts - Yamaha 2009 XP500Y TMAX Service Manual

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EAS23850

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches → Re-
place the camshaft.
2. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of specification → Replace the camshaft.
Camshaft lobe dimensions
Intake A
33.252–33.352 mm (1.3091–
1.3131 in)
Limit
33.152 mm (1.3052 in)
Intake B
24.956–25.056 mm (0.9825–
0.9865 in)
Limit
24.856 mm (0.9786 in)
Exhaust A
33.252–33.352 mm (1.3091–
1.3131 in)
Limit
33.152 mm (1.3052 in)
Exhaust B
24.956–25.056 mm (0.9825–
0.9865 in)
Limit
24.856 mm (0.9786 in)
3. Measure:
• Camshaft runout
Out of specification → Replace.
Camshaft runout limit
0.030 mm (0.0012 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification → Measure the camshaft
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.020–0.054 mm (0.0008–0.0021
in)
M MMM M MMM M M MMM M
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft caps).
b. Position a strip of Plastigauge® "1" onto the
camshaft journal as shown.
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CAMSHAFTS
M MMM M M MMM M M MMM M MMM