Inspection And Adjustment Of Valve Clearance - TOHATSU MFS25 Service Manual

16) 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.
1. Disconnect starter lock cables, and then recoil starter, belt
cover, spark plugs, and cylinder head cover.
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 : 0.15±0.02 mm ( 0.006±0.001 in ) d
Exhaust valve : 0.20±0.02 mm ( 0.008±0.001 in ) e
• 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-99030-0
Torque Wrench 6 :
P/N. 3AC-99070-0
4. Rotate flywheel clockwise to bring
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.
25/30 2006
" mark of cam shaft
"III" mark of cam shaft
○ I II
▲Marka
1 Cam Shaft Pulley
3 4
d
2
5
5 Valve Clearance Driver (Concaved Tip, Square, Width Between
Two Opposing Sides : 3mm)
6 Torque Wrench (10mm tip wrench)
1
III
3
3
e
2
6
3-19