Drive Belt Tension Adjustment - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SEAWATER COOLED MODELS

Drive Belt Tension Adjustment

1. Loosen 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 pulleys. Normally this location is between the seawater pump and the
idler pulley.
2. Use 5/16 in. socket and tighten adjusting stud until the correct deflection of the belt is
obtained at location specified above.
3. While holding adjustment stud at the correct belt tension, tighten 5/8 in. locking nut.
4. Run engine for a short period of time and recheck belt adjustment.
Index
Page 6A-20
Downloaded from https://needmanual.com/
a
a - Adjustment Stud and Pulley
SERVICE MANUAL NUMBER 23
75484
90-861326--1 MARCH 1999