Inspection Of Valve Clearance - TOHATSU MFS25 Service Manual

Power Unit

3) Inspection of Valve Clearance

1. Remove upper starter lock cable, and then recoil starter and
belt cover.
Disconnect breather hoses 1 (2).
2.
Remove fuel pump 2.
3.
4. Disconnect cooling water (fuel cooler) hoses (2).
5. Disconnect spark plug caps and ignition coils, and remove
spark plugs and cylinder head cover 3.
When removing or installing cylinder head
cover, use 10mm ring wrench with large offset
angle.
Rotate flywheel 4 clockwise to bring "
6.
shaft pulley 5 to " " mark b of cylinder head.
No.1 piston is to be at top dead center of
compression stroke.
7. 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 d : 0.15±0.02 mm ( 0.006±0.001 in )
(EX) Exhaust valve e : 0.20±0.02 mm ( 0.008±0.001 in )
Rotate flywheel 4 clockwise to bring "III" mark c of cam
8.
shaft pulley 5 to " " mark b of cylinder head.
9. Check and adjust No. 3 cylinder's intake and exhaust valve
clearances. Adjust gap if it is out of specified range.
In a similar way, bring "II" mark d of cam shaft pulley 5 to
10.
" " mark b and check and adjust No. 2 cylinder.
5-20
" mark a of cam
5 cam shaft pulley
3
● I (a)
Markb
1
2
5
a
b
4
II (d)
5
III (c)
25/30 2006