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Measure backlash between gears,
pair by pair, at three or more point.
If the reading exceeds the specified standard value, replace
defective part.
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Standard
value:
Balance shaft gear RH and oil pump
gear 0.040 - 0.192 mm Oil pump gear and
crankshaft gear 0.098 - 0.158
mm Crankshaft gear and idler gear 0.082
- 0.142 mm Idler gear LH and idler
gear 0.040 - 0.196 mm Idler gear LH and
balance shaft gear LH 0.040 - 0.222
mm Idler gear and idler B gear 0.096 -
0.156 mm
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If the reading exceeds the
specified standard value, replace defective part.
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Standard
value:
Balance shaft LH, RH 0.09
- 0.24 mm Idler gear and sprocket
assembly 0.05 - 0.20 mm Idler gear LH
assembly 0.05 - 0.20 mm
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Limit:
Balance shaft
LH, RH 0.3 mm Idler gear and sprocket
assembly 0.3 mm Idler gear LH assembly 0.3
mm
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1.Using the bar, hold the
balancer shaft drive gear RH.
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2.Remove the balancer shaft
drive gear RH bolt.
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![](../../../img/11/AK403916AB00ENG.png)
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Using the special tool Idler gear
bush puller (MH062463), remove the balancer shaft
bush.
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1.Using the bar, hold the
balancer shaft drive gear LH.
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2.Remove the balancer shaft
drive gear LH bolt.
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![](../../../img/11/AK403919AB00ENG.png)
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Using the special tool Idler
sprocket bush puller (MH062462), remove the idler gear
bush.
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![](../../../img/11/AK403940AA00ENG.png)
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caution |
- When removing the bolt be sure to lock
the camshaft
by holding the hexagonal part A with a
proper wrench. Do not use the timing
chain b for the
locking.
- The bolt is inversely threaded. The
arrow mark on its head B indicates its
turning
direction when tightened. To remove,
turn the bolt in the reverse
direction.
- The camshaft sprocket a and timing chain
b must be meshed in a fixed position. Do
not remove the timing chain from the
camshaft sprockets unless absolutely
necessary.
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![](../../../img/11/AK403941AA00ENG.png)
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caution |
The bolt is inversely
threaded. The arrow mark on its head B
indicates its tuning direction when
tightened.
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![](../../../img/11/AK403919AB00ENG.png)
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Using the special tool Idler
sprocket bush puller (MH062462), press-fit the idler gear
bushing into the idler gear from the side showing the match
marks "0."
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![](../../../img/11/AK501387AB00ENG.png)
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Install the idler gear and sprocket
assembly onto the idler shaft while aligning the mark
"1" with that on the crankshaft gear.
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![](../../../img/11/AK501381AB00ENG.png)
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1.Assemble the parts shown
in the illustration to the balance shaft LH. Be sure that
the washer and thrust spacer face in correct direction as
shown. Install
the balance shaft LH with the side showing the match mark
"0" outward.
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![](../../../img/11/AK501382AB00ENG.png)
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2.Insert the completed
balance shaft LH assembly into the crankcase assembly and
set it
in position with the dowel pin on the crankcase
assembly.
caution |
- Do not rotate the balance shaft LH
assembly
during insertion into the crankcase
assembly.
This may cause the O-ring
to be slipped
out of place.
- Insert the balance shaft LH assembly
using care not to damage the inner
surface
of the rear bearing in the
crankcase.
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![](../../../img/11/AK403916AB00ENG.png)
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Using the special tool Idler gear
bush puller (MH062463), press-fit the balancer shaft
idler bushing into the balancer shaft idler gear from the
side showing the match marks "3" and
"0."
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![](../../../img/11/AK403936AB00ENG.png)
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Install the idler gear LH assembly
onto the idler shaft. At this time, be sure to align
the match marks "3" and "0" on the idler gear with the
corresponding match marks on the idler
gear and sprocket assembly and the balance shaft gear
LH.
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![](../../../img/11/AK403931AC00ENG.png)
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1.Assemble the parts shown
in the illustration to the balance shaft RH. Be sure to
install the washer and thrust spacer in the direction shown
in the illustration,
and install the balance shaft gear RH with its mating mark
"0" aligned with the mating mark
"6" on the oil pump gear. 2.Insert the completed
balance shaft RH assembly into the crankcase assembly while
aligning
the mating marks "5" on the oil pump gear and the crankshaft
gear, and set the shaft assembly
in position with the dowel pin on the crankcase
assembly.
caution |
Insert the balance shaft RH
assembly using care not to damage
the inner surface of the rear bearing in the
crankcase.
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3.After the timing gear are installed in
position, check that all the rotary parts smoothly
rotate.
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