3-19
3
4st 9.9/15/20 2008
4
3
3
2
2
e
d
67
16) Inspection and Adjustment of Valve
Clearance
Lock Nut 4 :
7 N · m (5 lb · ft) [0.7 kgf · m]
· When loosening or tightening lock nut, hold
adjust screw by using valve clearance driver.
· Be sure to use torque wrench.
· Perform inspection and adjustment of valve
clearances when engine is cold.
· #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, fuel pump and cylinder head cover.
2. Rotate flywheel clockwise to bring "●1" mark of cam shaft
pulley 1 to "▲" mark a of cylinder head.
3. Check and adjust #1 cylinder's intake and exhaust valve
clearances.
• Put thickness gauge 5 into gap between valve end 2 and
adjust screw 3 to check the clearance. Use the following
procedure to adjust the gap if necessary.
· Loosen lock nut 4.
· Turn adjust screw 3 to adjust valve clearance.
· Tighten lock nut 4.
· Check valve clearance again.
1 Cam shaft pulley
6 Valve Clearance Driver
(Concaved Tip, Square, Width Between Two Opposing Sides : 3mm)
7 Torque Wrench (10mm tip wrench)
Valve Clearance Driver 6 :
P/N. 3AC-99071-0
Torque Wrench 7 :
P/N. 3AC-99070-0
4. Rotate flywheel clockwise to bring "2" mark of cam shaft
pulley 1 to "▲" mark a of cylinder head.
5. Check and adjust #2 cylinder's intake and exhaust valve
clearance in the same procedure as #1 cylinder.
5 Thickness gauge
Valve Clearance (when engine is cold) :
(IN) intake side d : 0.13 - 0.17mm (0.0051 - 0.0067in)
(EX) exhaust side e : 0.18 - 0.22mm (0.0071 - 0.0087in)
E_MFS20C_ch03_090105.qxd 09.1.20 5:23 PM ページ 19
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