Service Manual

External Engine Component Repair
Belt Replacement and Adjustment
Alternator Belt
1. Loosen bolt securing alternator brace to engine and
bo
lt securing alternator to brace (Fig. 36).
2. Remove two capscrews securing drive shaft coupler
to
engine crankshaft pulley.
3. Move drive shaft out of the way so belt can be
re
moved and new one installed.
4. Install new belt.
5. Connect drive shaft coupler to engine crankshaft
pulley with t
wo capscrews and washers.
6. To adjust belt tension, insert pry bar between alterna-
tor and engine and carefully pry alternator out until
proper tension is achieved. To check tension, depress
belt midway between crankshaft and alternator pulleys
with 22 lbs. of force. A new belt should deflect 0.3 to 0.5
inch and a used belt 0.4 to 0.55 inch. Tighten alternator
and brace bolts to secure adjustment.
Fan Belt
1. Loosen locknut on idler pulley (Fig. 37).
2. Remove belt by carefully moving around fan blades.
3. Install new belt.
4. To adjust belt tension, loosen idler pulley mounting
nu
t and move pulley to increase tension. To check
tension depress belt midway between fan and drive
shaft pulleys with 22 lbs. of force. A new belt should
deflect 0.48 to 0.58 inch and a used belt 0.55 to
0.65 inch. Tighten nut to secure adjustment.
3
2
1
Figure 36
1. Alternator belt
2. Alternator brace
3. Capscrews and washers
2
1
Figure 37
1. Fan belt
2. Idler pulley
Liquid Cooled Diesel Engine Page 4 - 32
Workman 3300-D/4300-D