Inspecting And Repairing Timing Gear And Camshaft; Measuring Timing Gear Backlash; Measuring Idler Gear And Camshaft Gear End Play; Measuring Cam Lift - Mitsubishi S6S-Y3T61HF Service Manual

3. Inspecting and repairing 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
Timing gear backlash
Note: With the injection pump gear attached to the pump,
install the injection pump gear to the front plate.
3.2 Measuring idler gear and camshaft gear
end play
Using a feeler gauge or dial gauge, measure the end play of
idler gear and camshaft gear.
If the measured value exceeds the limit, replace the thrust
plate with a new one.
Item
Idler gear
End play
Camshaft

3.3 Measuring cam lift

Measure the minor and major axes of cam to determine cam
lobe lift. If the lift is less than the limit, replace the camshaft
with a new one.
Item Nominal
6.682 mm
Inlet
[0.2631 in.]
Cam
lift
6.722 mm
Exhaust
[0.2646 in.]
Standard
0.05 to 0.15 mm 0.25 mm
[0.0020 to 0.0059 in.] [0.0098 in.]
Standard
0.05 to 0.20 mm 0.35 mm
[0.0020 to 0.0079 in.] [0.0138 in.]
0.10 to 0.25 mm 0.30 mm
[0.0039 to 0.0098 in.] [0.0118 in.]
Standard
6.382 to 6.782 mm 6.182 mm
[0.2513 to 0.2670 in.] [0.2434 in.]
6.422 to 6.822 mm 6.222 mm
[0.2528 to 0.2686 in.] [0.2450 in.]
INSPECTION AND REPAIR OF BASIC ENGINE
Limit
Limit

Measuring idler gear and camshaft gear end play

D
D
2
Limit
Measuring
directions
Measuring timing gear backlash
Measuring
locations
1
Measuring cam lift
6-11