Yanmar 4BY, Service Manual, Page: 226 / 275

ALTERNATOR
BY Service Manual 11-7
Repair
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 11-6.
Figure 11-2
4. Disconnect positive cable (Figure 11-2, (1))
from alternator.
5. Disconnect connector (Figure 11-2, (2)) from
alternator.
Figure 11-3
6. Pry off protective cap (Figure 11-3, (1)) and
remove bolt that secures idler pulley
(Figure 11-3, (2)) .
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. Connect cables to alternator. Tighten positive
cable nut to 13 N·m (115 in.-lb).
10. Install idler pulley and install protective cap.
11. Install alternator belt. See Replace Alternator
Belt on page 11-6.
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 11-6.
4. Remove intake manifold. See Intake Manifold
on page 5-70.
5. Remove alternator. See Remove and Install
Alternator on page 11-7 .
Figure 11-4
6. Remove bolt (Figure 11-4, (1)) securing idler
pulley (Figure 11-4, (2)) . Remove idler pulley.
000 38 42
(
3
)
(2)
(1)