Inspecting And Repairing Gear Case, Timing Gear And Camshaft; Measuring Timing Gear Backlash; Measuring Clearance Between Idler Gear And Idler Shaft; Replacing Idler Shaft - Mitsubishi L Series Service Manual

INSPECTION AND REPAIR OF BASIC ENGINE

3. Inspecting and repairing gear case, timing gear and camshaft

3.1 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.
Item
0.010 to 0.136 mm
[0.0004 to 0.0054 in.]
Between crank-
shaft gear and
0.040 to 0.118 mm
idler gear
[0.0016 to 0.0047 in.]
Between idler
0.010 to 0.136 mm
gear and valve
[0.0004 to 0.0054 in.]
camshaft gear
Between idler
0.037 to 0.117 mm
gear and pump
[0.0015 to 0.0046 in.]
camshaft gear
0.010 to 0.220 mm
[0.0004 to 0.0087 in.]
Between valve
camshaft gear
0.007 to 0.235 mm
and PTO gear
[0.0003 to 0.0091 in.]
3.2 Measuring clearance between idler gear
and idler shaft
Measure the inside diameter of the idler gear and outside
diameter of the idler shaft. Replace the idler gear or idler
shaft if the clearance exceeds the limit.
Item
Clearance between idler
gear and idler shaft [0.0012 to 0.0026 in.]

3.3 Replacing idler shaft

Press-fit the idler shaft into the cylinder block to the
dimension in the illustration.
6-8
Standard Limit
Spur
gear
Heli-
cal
gear
Spur
gear
0.300 mm
[0.0118
Heli-
in.]
cal
gear
Spur
gear
Heli-
cal
gear
Standard Limit
0.030 to 0.066 mm 0.200 mm
[0.0079 in.]
Measuring timing gear backlash
Measuring idler gear inside diameter and idler shaft
outside diameter
+0.3
23.3 mm [0.917
0
Replacing idler shaft
Measuring directions
Measuring
points
+0.12
in.]
0