Checking The Valve Lifters And Valve Lifter Cases; Checking The Push Rod Cover - Yamaha MT-01 Service Manual

Manuals by Motomatrix / www.motomatrix.co.uk
EAS23920
CHECKING THE VALVE LIFTERS AND
VALVE LIFTER CASES
1. Check:
• Valve lifter
Blue discoloration/excessive wear/pitting/
scratches → Replace and check the lubrica-
tion system.
2. Check:
• Valve lifter case "1"
Damage/wear → Replace the valve lifter
case.
• Seal "2"
• O-ring "3"
Damage/wear → Replace the O-ring.
3. Measure:
• Valve lifter outside diameter "a"
Out of specification → Replace.
Valve lifter outside diameter
(intake)
22.962–22.974 mm (0.9040–
0.9045 in)
Valve lifter outside diameter
(exhaust)
22.962–22.974 mm (0.9040–
0.9045 in)
Email: info@motomatrix.co.uk
4. Measure:
• Valve lifter case inside diameter "a"
Out of specification → Replace.
Valve lifter hole inside diameter
(intake)
23.000–23.021 mm (0.9055–
0.9063 in)
Valve lifter hole inside diameter
(exhaust)
23.000–23.021 mm (0.9055–
0.9063 in)
5. Calculate:
• Valve lifter-to-valve lifter case clearance
NOTE:
Calculate the clearance by subtracting the valve
lifter case outside diameter.
Above 0.072 mm (0.0028 in) → Replace the
defective part(s).
Valve-lifter-to-valve-lifter-hole
clearance
0.026–0.059 mm (0.0010–0.0023
in)
EAS23930

CHECKING THE PUSH ROD COVER

1. Check:
• Push rod cover
Cranks/damage → Replace.
• Seal
5-25
CAMSHAFTS