MTD 75 series - Page 20

61/ 65/70/75 Series Horizontal Shaft Engines
14
61/65/70 series engines
6. Check valve lash between each valve stem and
rocker arm using a feeler gauge.
6a. Intake valve lash should be 0.004” - 0.006”
(0.10 - 0.15 mm). See Figure 1.14.
6b. Exhaust valve lash should be 0.006” - 0.008”
(0.15 - 0.20 mm). See Figure 1.15.
6c. Use a 10mm wrench to loosen the jam nut,
and a 14mm wrench to adjust the rocker arm
fulcrum nut.
• Tighten the rocker arm fulcrum nut to close-up
the clearance between the end of the valve
stem and the contact point on the rocker arm.
• Loosen the rocker arm fulcrum nut to open-up
the clearance between the end of the valve
stem and the contact point on the rocker arm.
6d. Hold the fulcrum nut with a 14mm wrench,
tighten the jam nut to a torque of 80 - 106 in-
lb. (9 - 12 Nm) using a 10mm wrench.
6e. Double-check the clearance after tightening the jam nut, to confirm that it did not shift. Re-adjust if nec-
essary.
Figure 1.14
Setting intake valve lash
0.004” feeler
gauge
0.006” feeler
gauge
Figure 1.15