S5 Workshop Manual
Engine
EM-57
6) Rise up tensioning wheel "B" to
tension timing belt "B" and tension its
tensioning side. Under this condition,
tighten bolt to fix tensioning wheel "B".
When tightening bolt, pay attention to
avoid shaft rotation.
If the shaft rotates, belt tensioning force
will change, and noise may be produced
when engine rotates.
7) Inspect and verify that timing marks
are aligned.
8) Verify tensioning force of timing belt.
Method 1: Use fingers to press the span
centre on tensioning side according to the
arrow direction. This is to verify whether
belt deflection is within the specified
value range.
Belt deflection: 5
～
7 mm ( 0.20
～
0.28 inch)
Method 2: Use a tension meter to measure the tensioning force of timing belt.
Span length
Pressure
Torque
139 mm (5.47 inch)
0.42 kg/cm
2
(42 KPa )
50
～
100
N•m
(500
～
1000
kg/cm
2
)
EM093
EM092
Secondary timing belt “B”
Secondary
tensioning wheel
“B”
Tensioning side
Bolt centre
Timing mark
Bolt
Timing mark
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