DISASSEMBLY OF BASIC ENGINE
5-9
3.1 Removing crankshaft pulley
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The bar that stops the the crankshaft from turning may
come off. Pay due attention to safety.
(1) Screw two guide bolts into the threaded holes at the rear
end of the crankshaft. Stick a bar across the guide bolts
to prevent the crankshaft from turning.
(2) Remove the crankshaft pulley.
(3) Take out the woodruff key of the crankshaft.
Removing crankshaft pulley
3.2 Removing timing gear case
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The front plate is bolted to the crankcase from inside
the gear case. Do not attempt to remove the front plate
together with the gear case by tapping.
(1) Remove bolts from the timing gear case.
(2) Remove the timing gear case.
Note: Bolts have different lengths. Pay attention to the
positions of bolts to ensure correct reassembling.
Removing timing gear case
3.3 Measuring timing gear backlash
Measure the backlash of the timing gears by using one of
the following two methods; measure the gear play with the
dial gauge plunger applied to a tooth flank on the pitch
circle at a right angle to the tooth axis, or measure the
clearance between gears by inserting a feeler gauge between
the gears at the tooth-to-tooth contacting area. Replace the
faulty gear pair if the limit is exceeded.
Measuring idler gear backlash
Bolt
(M12 × 1.25 mm)
Item Standard Limit
Timing
gear
backlash
Between crankshaft
gear and idler gear
0.03 to 0.16 mm
[0.0012 to 0.0063 in.]
0.25 mm
[0.0098 in.]
Between idler gear and
valve camshaft gear
0.04 to 0.17 mm
[0.0016 to 0.0067 in.]
Between idler gear and
pump camshaft gear
0.03 to 0.18 mm
[0.0012 to 0.0071 in.]
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