DISASSEMBLY OF BASIC ENGINE
5-10
3.4 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 backlash timing gear
3.5 Removing idler gear
Remove the idler gear while turning the gear.
Removing idler gear
3.6 Removing camshaft
&$87,21
Be careful not to damage the camshaft cam, the cam-
shaft journal, and the cam hole of the cylinder block.
(1) Rotate the camshaft to see the thrust plate bolt through
the camshaft gear hole.
(2) By using the socket, remove the thrust plate bolt.
(3) Remove the camshaft from the cylinder block
Removing camshaft
Item Standard Limit
Timing
gear
backlash
Between crankshaft
gear and idler gear
0.04 to 0.12 mm
[0.0016 to 0.0047 in.]
0.30 mm
[0.0118 in.]
Between idler gear
and valve camshaft
gear
Between idler gear
and pump camshaft
gear
Between valve
camshaft gear and
PTO gear
0.08 to 0.19 mm
[0.0031 to 0.0075 in.]
Between pump
camshaft gear and
oil pump gear
0.07 to 0.20 mm
[0.0028 to 0.0079 in.]
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