CAC Gasoline Engine Maintenance And Servicing Manual
22
Note：With belt removed， don't turn gear excessively，or piston
head and valve may be damaged for contacting.
——If belt need to be reused ，check for improper
wear ,delaminate crack (particularly at the foot of teeth) or dirt. If
lightly suspected, replace it.
Installation and adjustment：
——Crankshaft should be positioned at no.1 cylinder TDC，if
necessary, crankshaft may only be turned slightly for adjustment
and blocked at flywheel ring gear.
——Engage timing belt tooth with crankshaft grooves，and pull
belt up straight to the right engaging belt with cam gear grooves.
During the installation of used belt, insure belt is in the right
direction and match belt with appropriate tooth.
With belt installed, 2 gears should not make any movement.
——Pull belt around tension pulley carefully，engage belt tooth
with gear teeth grooves.
Recheck both gears, there should be no movement.
——Loosen 2 tension pulley mounting bolts，push tension pulley
right to the extreme (viewed from the direction of pulley )，tighten
2 tension pulley mounting bolts and loosen crankshaft locking
device.
——Rotate crankshaft clockwise (viewed from the pulley end) 2
turns until no.1 cylinder reaches its TDC of compression.
——Grab the midway of the right side belt between crankshaft
gear and camshaft gear with thumb and forefinger. If belt tension
is as specified, belt may be twisted 90°.
To adjust belt tension，loosen 2 tension pulley mounting bolts and
push tension pulley right side using screwdriver as push rod，then
tighten mounting bolts and rotate crankshaft. Recheck tension.
It may take 2- 3 times before tension is as specified. After
adjustment, tighten tension pulley mounting bolts to 16—20Nm.
——It is only a approximate method to adjust belt，and belt
tension should be checked as soon as possible by professionals
with special tools .
Fig.13
Fig.14
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