Removing Crankshaft Pulley; Removing Timing Gear Case; Measuring Timing Gear Backlash - Mitsubishi S3Q2 Service Manual

3.1 Removing crankshaft pulley

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.

3.2 Removing timing gear case

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.

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.
Item
Between crankshaft
gear and idler gear
Timing
Between idler gear and
gear
valve camshaft gear
backlash
Between idler gear and
pump camshaft gear
Standard Limit
0.03 to 0.16 mm
[0.0012 to 0.0063 in.]
0.04 to 0.17 mm 0.25 mm
[0.0016 to 0.0067 in.] [0.0098 in.]
0.03 to 0.18 mm
[0.0012 to 0.0071 in.]
DISASSEMBLY OF BASIC ENGINE
Removing crankshaft pulley
Removing timing gear case
Measuring idler gear backlash
Bolt
(M12 × 1.25 mm)
5-9