Yanmar 6BY2 - Repair; Replace Alternator Belt; Remove and Install Alternator

ALTERNATOR
Repair
12/05
BY Service Manual
11-5
© 2009 Yanmar Marine International
REPAIR
Replace Alternator Belt
1. Disconnect battery negative (-) cable from the
battery.
2. Remove belt guard.
3. Remove seawater pump belt. See Replace
Seawater Pump Belt on page 7-19.
Note: Figure 11-1(A) shows belt routing for
stern drive equipped models.
Figure 11-1(B) shows belt routing for
marine gear equipped models.
Figure 11-1Belt Routing
Figure 11-1
1 – Belt Tensioner
2 – Coolant Pump
3 – Crankshaft
4–Alternator
5 – Fixed Idler
6 – Seawater Pump
7 – Power Steering Pump (Stern Drive Only)
4. Use a socket and breaker bar to rotate the belt
tensioner and relieve belt tension. Remove belt.
NOTICE: If belt is to be reused, note direction of
travel and install in same direction of travel.
5. Installation is the reverse of removal.
CAUTION! Pinch Hazard. ALWAYS use care
not to pinch a finger between belt and pulley
while installing belt. Failure to comply may
result in minor or moderate injury. NOTICE:
Ensure belt correctly engages all grooves of
each pulley. Failure to do so will lead to
premature belt failure.
Remove and Install Alternator
1. Disconnect battery negative (-) cable from the
battery.
2. Remove belt guard.
3. Remove alternator belt. See Replace Alternator
Belt on page 11-5.
4. Disconnect positive (+) cable (Figure 11-2, (1))
from alternator.
Figure 11-2
Figure 11-2
5. Disconnect connector (Figure 11-2, (2)) from
alternator.
A
B
0003690
(1)
(2)
(7)
(3)
(6)
(5)
(4)
(2)
(6)
(3)
(1)
(5)
(4)