Yanmar 6BY2 - Remove and Install Alternator Belt Tensioner

ALTERNATOR
Repair
11-6 BY Service Manual
© 2009 Yanmar Marine International
6. Pry off protective cap (Figure 11-3, (1)) and
remove the bolt that secures idler pulley
(Figure 11-3, (2)).
Figure 11-3
Figure 11-3
7. Remove two bolts (Figure 11-3, (3)) and
remove alternator from engine.
8. Install alternator and tighten mounting bolts to
38 N·m (28 ft-lb).
9. Install idler pulley and install protective cap.
10. Connect cables to alternator. Tighten positive
cable nut to 13 N·m (115 in.-lb).
11. Install alternator belt. See Replace Alternator
Belt on page 11-5.
12. Install belt guard.
13. Connect battery negative (-) cable to the
battery.
Remove and Install Alternator Belt
Tensioner
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. Remove intake manifold. See Intake Manifold
on page 5-66.
5. Remove alternator. See Remove and Install
Alternator on page 11-5.
6. Remove bolt (Figure 11-4, (1)) securing idler
pulley (Figure 11-4, (2)). Remove idler pulley.
Figure 11-4
Figure 11-4
Note: Bolt (Figure 11-4, (3)) must be removed
and installed with the belt tensioner
spring assembly.
7. Loosen bolt (Figure 11-4, (3)) securing
tensioning pulley and arm to belt tensioner
spring assembly.
8. Remove arm and pulley (Figure 11-4, (4)) in
direction of arrow.
9. Remove bolts. Remove tensioner spring
assembly (Figure 11-5, (1)) in direction of
arrow.
Figure 11-5
Figure 11-5
10. Installation is done in reverse of removal. Install
new seal (Figure 11-5, (2)).
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