Isuzu NHR 4J Series, Workshop Manual

Page: 168 / 406

4JB1/4JB1T/4JB1TC/4JG2 – ENGINE 6A1 – 33
• Mount new timing belt on pulleys in the following steps.
Crankshaft timing pulley
!
→
camshaft
Timing pulley
"
→
Idle pulley
#
→
Injection
Pump pulley
$
→
tensioner
%
• Set the belt on crankshaft timing pulley and hold with
one hand.
• Stretch and pass the belt round each pulley with the
other hand.
• After passing it round injection pump pulley, install
tensioner while taking care not to slacken the belt.
CAUTION
• On completion of belt passing, make sure that the
setting mark on crankshaft timing pulley is set.
• If not set, reset the mark and repeat the belt passing.
• Remove tension adjust, lever mounting bolt, and
loosen the fulcrum bolt to such extent that the lever is
movable.
• Hung a spring balance from the end hole of tension
adjust lever, and with the balance pulled down with
9kg., loosen once the tensioner mounting bolt and
there retighten it.
• Turn the crankshaft by 45° counterclockwise to shift
belt slackness on to the tensioner.
• Again hang the spring balance from the end hole of
tension adjust lever and pull it down with the specified
force. Under this condition, loosen tensioner mounting
bolt to absorb belt slackness and retighten is to
specified torque.
Belt N ∙ (kg/lb)
Tension 98 - 118 (10 - 12/22 - 26)
Bolt N ∙ m (kg ∙ m/lb ∙ ft)
76 (7.8/56)
• Fix the tension adjust lever.
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