TOHATSU MFS 60A Service Manual page 25

2. Inspection Items
1) Inspection and Adjustment of Valve Clearance
• Perform inspection and adjustment of valve
clearances when engine is cold.
• No.1 piston is to be at top dead center of
compression stroke(make sure both valves are
closed).
1. Remove flywheel cover, spark plug, cylinder head cover,
ignition coil connector and harness.
2. Rotate flywheel clockwise to bring "
pulley 1 to " " mark a of cylinder head.
3. Check and adjust No. 1 cylinder's intake and exhaust valve
clearances.
• Insert thickness gauge in the gap between valve end 2 and
adjust screw 3.
• Loosen lock nut 4.
• Turn adjust screw 3 to adjust valve clearance.
• Tighten lock nut 4.
• Check valve clearance again.
Valve Clearance :
Intake valve : 0.20 - 0.25 mm (0.008 - 0.010 in) b
Exhaust valve : 0.30 - 0.35 mm (0.012 - 0.014 in) c
• When loosening or tightening lock nut, tighten
adjust screw by using valve clearance driver.
• Be sure to use torque wrench.
Lock nut :
7 N·m ( 5 lb·ft ) [ 0.7 kgf·m ]
Valve Clearance Driver 5 :
P/N. 3AC-99071-0
Torque Wrench 6 :
P/N. 3AC-99070-0
4. Rotate flywheel clockwise to bring "III" mark of cam shaft
pulley 1 to " " mark a of cylinder head.
5. Check and adjust No. 3 cylinder's intake and exhaust valve
clearances in the same procedure as No. 1 cylinder.
6. Check and adjust No. 2 cylinder's valve clearances in the
same procedure as No. 1 cylinder.
4st 60 2019
I" mark of cam shaft
1 Cam Shaft Pulley
5 Valve Clearance Driver (Concave Tip, Square, Width Between
6 Torque Wrench (10 mm tip wrench)
4
3
b
2
5
Two Opposing Sides : 3 mm)
1
Mark
a
3
3
c
2
6
3-3