8 INSPECTION AND MAINTENANCE
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
127
Pub. No. 291Y1-40720 Revision: 5
1 Check the belt visually.
• Check for peeling or breaks.
ï‚®If any abnormality is found, replace the belt
with a new one.
2 Check the belt tension.
ï‚®If the belt tension is out of the standard
value, adjust the belt tension. "Table 8-3
Ribbed Belt Tensile Force" (→ Page 130)
• The new belt has an initial stretch.
Operate the engine for about 1 hour
and adjust the belt tension again.
Fig. 8-1 Belt Tension - Adjust (V-belt)
Fig. 8-2 Shape of V-belt
Fig. 8-3 Belt Tension - Adjust (Ribbed Belt)
Fig. 8-4 Shape of Ribbed Belt
• Tool: Gauge (10 mm [0.39 in.] wide)
Table 8-1 Type of Belt (V-belt)
Type of Belt Standard value
V-belt
When the center of the belt span
is pressed with a force of approx.
98 N {9.99 kgf} [22.03 lbf] to 147N
{14.99 kgf} [33.05 lbf], the deflec-
tion of the belt must be 10 to 15
mm [0.39 to 0.59 in.].
10 to 15 mm
[0.39 to 0.59 in.]
Table 8-2 Type of Belt (Ribbed Belt)
Type of Belt Standard value
Ribbed Belt
When the midpoint of the straight
part of the belt is pressed with a
force of "Table 8-3
Ribbed Belt
Tensile Force" (→ Page 130) by
using a 10 mm [0.39 in.] wide
gauge, the deflection is 15 mm
[0.59 in.].
15 mm
[0.59 in.]
10 mm
[0.39 in.]
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