Inspection Of Valve Clearance - TOHATSU MFS 9.9 Owner's Manual

Power Unit

3) Inspection of Valve Clearance

Perform adjustment of valve clearances when
engine is cold.
1. Remove upper starter lock cable, and then recoil starter and
belt cover.
Remove fuel pump 1.
2.
3. Disconnect plug cap connection, and then, remove spark
plug and cylinder head cover 2.
When removing or installing cylinder head
cover, use 10mm ring wrench with large offset
angle.
Rotate flywheel 3 clockwise to bring "●1" mark a of cam
4.
shaft pulley 4 to "▲" mark b of cylinder head.
No.1 piston is to be at top dead center of
compression stroke.
5. Check and adjust No. 1 cylinder's intake and exhaust valve
clearances. Adjust gap if it is out of specified range.
Valve Clearance (when engine is cold)
(IN) Intake valve : 0.13 - 0.17 mm (0.0051 - 0.0067 in)
(EX) Exhaust valve : 0.18 - 0.22 mm (0.0071 - 0.0087 in)
Loosen rocker arm lock nut 5, and turn adjusting screw 6
6.
so that valve clearances are within the specified range.
· Turning adjust screw 6 clockwise makes
valve clearance smaller.
· Turning adjust screw 6 counterclockwise
makes valve clearance larger.
Valve clearance driver 8 :
P/N. 3AC-99071-0
Torque wrench 9 :
P/N. 3AC-99070-0
Thickness gauge 0 :
Use commercially available item.
5-16
2
5
6
d
1
4
a
b
3
6
e
4st 9.9/15/20 2008