Flywheel, Timing Gear, Camshaft; Measuring The Flywheel Flatness; Replacing The Ring Gear; Measuring The Timing Gear Backlash - Mitsubishi diesel engines Service Manual

2. Flywheel, Timing Gear, Camshaft

2.1 Measuring the flywheel flatness

Place the flywheel on a surface plate. Run a dial
gauge over the frictional surface of the flywheel
to measure the flatness.
If the measured value exceeds the limit, grind the
frictional surface.
0.150 (0.0059)
Flywheel flatness

2.2 Replacing the ring gear

Check the ring gear for fractured or excessively
worn gear teeth.
following manner.
(1) Removing the ring gear
(a) Using an acetylene torch or other similar
equipment, heat the ring gear evenly.
(b) Using a hammer and a rod, tap the ring gear
evenly on the entire periphery until the gear
comes off.
(2) Installing the ring gear
Using a piston heater or other similar equipment,
heat the ring gear [to approximately 150• Ž
• ‹ ‚ e ) or less]. With the gear warmed up, install it
onto the flywheel with the un-chamfered side
first.

2.3 Measuring the timing gear backlash

Measure the backlash between the gears and use
the measurements as references upon reassembly.
If any of the measured values exceeds the limit,
replace all gears unless otherwise specified.
Crank gear - idler
gear
Idler gear - valve
camshaft gear
Idler gear - pump
camshaft gear
Valve camshaft
gear - PTO gear
Pump camshaft
gear - oil pump
gear
ENGINE MAIN PARTS - INSPECTION AND CORRECTION
Unit: mm (in.)
Standard
Limit
value
0.50 (0.0197)
or less
If faulty, replace in the
Unit: mm (in.)
Standard value Limit
0.040 to 0.120
(0.0015 to 0.0047)
0.300
(0.0120)
0.080 to 0.190
(0.0032 to 0.0075)
0.070 to 0.200
(0.0028 to 0.0079)
Measuring the flywheel flatness
Ring gear
Removing the ring gear
(302
Measuring the timing gear backlash
Flywheel
2 - 23