OP
ERATlO
:-l. L
UBRI
C
ATION
.
MAINTENANCE
AND
TUNE-
UP 49
outerbelt), it is a good idea to replace all belts as a set. The
added expense is small compa red 10 the cost
of
replacing
the belts individually, and replacing each belt reduces the
possibility
ofa
breakdown on the water, which could cost
far more in time and money.
Make sure the drive belts arc properly tensioned at all
limes. I
flo
ose, the belts will not drive the driven compo-
nenrs at maxim um efficiency. The belts willalso
wear
rap-
idly
because
of
the increased friction caused by slippage.
Bells that are too tight will
be overstressed and prone to
premature failure. An excessively light belt will also e ver-
stress the water pump or alternator bearings. resulting in
premature failure.
Alternator drive bell udju.\lme lll (models equipped with
seawater cooling)
1. Check alternator drive bell tension by depressing the
drive belt at the midway point on the belt
(A.
F
igur
e 11).
The belt should deflect approximately 0.4 inch (10 mm)
with moderate finger pressure.
A
2. To adjust alternatordrive bell tension, loosen the alter-
nator retaining nuts
(8
, Fil:ure 12), then reposition the al-
ternator. Retighten the retaining bolts and
recheck belt
tension.
Alternator drive belt adjU!ilmenl {models equipped
....
ith
fresh
....
ater cooling)
The alternator drive belt also drives the freshwater cool-
ing pump on engi nes so equipped.
I. Check alternator drive belt tens ion by depressing the
drive belt at the midway point on the belt (A,
Figure 13).
The belt should deflect approx imately 0.4 in (10 mm)
with moderate finger pressure.
2. To adjust alterna tor drive belt tension, loosen the alter-
nator retaining bolts (B,
Figure
12), then reposition the al-
ternator. Retighten the retaining bolts and recheck belt
tension.
Sea
....
ater
pump
drive belt adjU'ifmenl (2G.U. 2G.U20.
3GM
.
3GM30
. 3H.
\f
And
311.\
/35
mod
els)
I. Check seawater pump drive belt tension by depressing
the drive belt at the midway point on the belt (A,
Figur
e
14).
The belt should deflect approximately 0.24 in (6 mm)
with moderate finger
pressure.
2. To adjust seawater pump drive belt tension, loosen the
screws (B, Figu re 14) that retain the water pump mount-
ing plate. Reposition the plate to obtain the correct belt
tension, then retighten the
bolt and nut. Recheck belt ten-
sron.
3
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