Inspection; Replacing And/Or Adjusting Tension - Mercury MerCruiser MCM 4.3L ALPHA Service Manual

MAINTENANCE

Inspection

1. Inspect drive belt for the following:
• Excessive wear
• Cracks
NOTE: Minor, transverse cracks (across the belt width) may be acceptable. Longitudinal
cracks (in direction of belt length) that join transverse cracks are NOT acceptable.
• Fraying
• Glazed surfaces

Replacing and/or Adjusting Tension

REMOVAL
1. Loosen 5/8 in. locking nut on adjustment stud.
2. Turn adjustment stud and loosen belt.
3. Remove drive belt.
INSTALLATION AND ADJUSTMENT
4. Install drive belt on pulleys.
5. Adjust tension by loosening 5/8 in. locking nut on adjustment stud. Leave wrench on
adjustment stud.
NOTE: Belt deflection is to be measured on the belt at the location that has the longest dis-
tance between two (2) pulleys. Proper tension is 1/4 in. (6 mm) deflection with moderate
thumb pressure.
6. Use 5/16 in. socket and tighten adjusting stud until the correct deflection of the belt is
obtained at location specified above.
Index
Page 1B-26
a - Fraying
b - Cracks
SERVICE MANUAL NUMBER 25
b
a
90-861328--1 NOVEMBER 1999
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