TOHATSU BFT250A Service Manual page 68

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MAINTENANCE
BELT TENSION INSPECTION USING
BELT TENSION GAUGE
Set the special tool at the center between the alternator
belt pulley [1] and the crankshaft pulley [2], and
measure the belt tension.
TOOL:
Belt tension gauge [3]
BELT TENSION:
New belt*1 880 – 980 N (90 – 100 kgf, 198 – 220 lbf)
New belt*2 660 – 740 N (67 – 75 kgf, 148 – 166 lbf)
Used belt
• When installing a new belt, adjust the belt tension to
*1 specification, and then run the engine for 5
minutes and readjust the belt tension to *2
specification.
If the belt tension is out of the specification, adjust the
belt tension.
BELT DEFLECTION INSPECTION
Measure the belt deflection by pushing the alternator
belt at the center between the pulleys with 98 N (10 kgf,
22 lbf) of force.
BELT DEFLECTION:
New belt*1 3.20 – 3.40 mm (0.126 – 0.134 in)
New belt*2 4.2 – 4.8 mm (0.17 – 0.19 in)
Used belt
• When installing a new belt, adjust the belt deflection
to *1 specification, then run the engine for 5 minutes
and readjust the belt deflection to *2 specification.
If the belt deflection is outside the specification, adjust
the belt tension.
BELT TENSION ADJUSTMENT
1. If the belt tension or the belt deflection is out of the
specification, loosen the alternator bolt [1] and
alternator nut [2] and adjust the belt tension or
deflection by turning the special adjuster bolt [3] right
or left.
2. After adjustment, tighten the alternator bolt and the
alternator nut in this order to the specified torque.
TORQUE:
Alternator bolt: 44 N·m (4.5 kgf·m, 32 lbf·ft)
Alternator nut: 26 N·m (2.7 kgf·m, 19 lbf·ft)
3. After tightening the bolt and nut to the specified
torque, check the alternator belt tension again.
If the measurement is still outside the specification,
repeat the step 1 and 2 again.
3-10
07TGG-001000A or
07JGG-001010A
490 – 590 N (50 – 60 kgf, 110 – 133 lbf)
5.4 – 6.3 mm (0.21 – 0.25 in)
[1]
[3]
BELT DEFLECTION
When pushed with 98 N
(10 kgf, 22 lbf) of force.
[1]
[3]
[2]
[2]