Suzuki sq-416-420-625 Service Manual page 272

4B-2 PROPELLER SHAFTS
DIAGNOSIS TABLE
Condition
Abnormal noise
Vibration
DIAGNOSIS
Possible Cause
D Loose universal joint bolt.
D Spider bearing worn out or stuck.
D Wear spider.
D Deformed propeller shaft.
PROPELLER SHAFT JOINT CHECK
If universal joints are suspected of producing chattering or rattling
noise, inspect them for wear. Check to see if cross spider rattles in
yokes or if splines are worn down and replace defective propeller
shaft with new one.
Noise coming from universal joint can be easily distinguished from
other noises because rhythm of chattering or rattling is in step with
cruising speed. Noise is pronounced particularly on standing start
or in coasting condition (when braking effect of engine is showing
in the drive line).
Correction
Tighten universal joint bolt.
Replace.
Replace propeller shaft.
Replace.