Mitsubishi S4Q, User Manual

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44 / 174 Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
TIMING GEARS, CAMSHAFT AND OIL
PAN
ENGINE MAIN PARTS
1. Removing crankshaft pulley
1) Install two bolts (M12 x 1.25 mm [0.47 x 0.049
in.]) to the rear end of the crankshaft and put a
bar between the bolts to hold the crankshaft,
as shown in the illustration.
2) Remove the pulley from the crankshaft.
2. Removing timing gear case
Remove the timing gear case with the oil pump
drive gear and idler gear from the crankcase. Pull
the case straight off the locating dowels.
3. Measuring timing gear backlash
Measure the backlash betw een the gears and
make a record of the measurements to be referred
to at the time of assembly. If the backlash exceeds
the service limit, replace the gears.
Unit: mm [in.]
Figure 59 Removing crankshaft pulley
Bolts
(M12 x 1.25 mm)
[0.47 x 0.049 in.]
CAUTION
Make sure the bar will not come off when removing
the pulley.
Figure 60 Removing timing gear case
CAUTION
The front plate is bolted inside the gear case. Do not
attempt to remove the plate with the case by tapping.
Figure 61 Measuring timing gear backlash
Item
Assembly
Standard
Service
Limit
Backlash between
crankshaft gear and
idler gear
0.05 to 0.15
[0.0020 to 0.0059]
0.25
[0.0098]
Backlash between
idler gear and
camshaft gear
Backlash between
injection pump drive
gear and idler gear
0.04 to 0.16
[0.0016 to 0.0063]