Belt Adjustment; V-Belt Diagnosis - Daewoo G424 Gasoline Service Manual

Belt Adjustment

Drive belts must grip the entire contact area of the
pulley. When drive belts are too loose, the belts can
slip, tear, burn, or grab and snap. More belts fail from
being too loose than too tight.
Belts that are too tight can damage the engine by
causing side loading of the crankshaft, crankshaft
bearings, and accessories or accessory bearings. Too
much belt tension will also stretch and weaken the
belts.
After a belt has made one complete revolution it is
considered used and should be adjusted to the used
belt tension specification. When the drive belts are
worn, they should be replaced. Tightening worn drive
belts will not prevent slipping and can cause damage
to the engine.
Do not use belt dressings to extend belt life. Most
dressings contain chemicals that soften the belts.
Check the belts at 1500 hour intervals. Also check all
necessary mounting or adjusting bracket bolts.
7 to 9 mm
(0.28 to 0.35 in.)
The fan belt is properly tense if it deflects 7 to 9mm
(0.28 to 0.35 in) as it is depressed with a finger
between the pulley and pulley of the long distance
side. Excessive tension can cause quick wear of the
belt and bearings of the water pump and the alternator
Excessive slackness ot presence of oil on the belt, on
the other hand, can lead to engine overheating and
insufficient charging due to slipping belt.
CATUTION : Never attempt to adjust tension of the fan
belt while leaving the engine in operation.
G424 Service Manual

V-Belt Diagnosis

Belts and pulleys wear evenly with use. Unusual signs
of wear indicate some correction is needed. The
correction of any of the listed conditions will help
extend belt life.
Causes of Belt failure
• Misalignment of the pulleys.
• Wrong size belt.
• Wrong length belt.
• Wrong tension.
• Damaged pulley sheaves or bent pulley shafts.
• Damaged belt.
• Belt damaged during installation.
• Oil or grease on belts.
Base Cracking
A belt with excessive cross-checking that extends into
the rubber on the base of a belt and shows little or no
side wear indicates the belt is damaged. If the base of
the belt shows cross-checking, the belt has been
exposed to weather to the extent that the fabric is
starting to rot.
Fabric Tear
A fabric tear can be the result of:
• Operating a belt on a worn pulley.
• Belt tension too light causing the belt to ride in the
pulley groove.
• Dirty pulley grooves.
• Pulley misaligned.
Cover Tear
Cover tears result when the belts are too loose or too
long and the belt rubs against other compo-nents.
Adjust the belt tension and use the correct length of
belt.
Slip Burn
Slip burns occur when the belts are too loose or
slipping under load. Install a new belt and adjust
properly. Check for a worn pulley.
116 Cooling System