Flushing The Power Package - MerCruiser Sterndrive 4.3L TKS Owner's Manual

NOTE: Belt deflection is to be measured on the belt at the location that has the longest
distance between two pulleys.
1. Loosen the 16 mm (5/8 in.) locking nut on the adjustment stud.
2. Turn the adjustment stud and loosen the belt.
3. If a new serpentine drive belt is required, remove the old belt and install a new belt onto
the pulleys.
4. Put a wrench on the adjustment stud 16 mm (5/8 in.) locking nut.
5. Use a 8 mm (5/16 in.) socket and tighten adjusting the stud to adjust the belt deflection.
6. Using one of the 2 methods following, check for correct deflection.
a.
b.
7. While holding the adjustment stud at the correct belt tension, tighten the
16 mm (5/8 in.) locking nut.
8. Operate the engine for a short period of time and recheck the belt adjustment.

Flushing the Power Package

Your boat could come equipped with a combination of any of three different types of water
pickups: through the hull, through the transom, and through the sterndrive. The flushing
procedures for these systems are separated into two categories: sterndrive water pickups
and alternative water pickups. Consult your authorized Mercury MerCruiser dealer for
further explanation.
90-860171061 DECEMBER 2006
Push down with moderate thumb pressure on the longest stretch of belt. Proper
deflection is 13 mm (1/2 in.).
Attach the Kent Moore Belt Tension Gauge to the belt. The gauge has different
ranges for new and used belts.
b
a - Kent Moore Tension Gauge
a
a - 16 mm (5/8 in.) locking nut
a
b -
b
b -
Section 5 - Maintenance
14980
Serpentine belt
6119
8 mm (5/8 in.) adjusting stud
Page 81