Mitsubishi 4DQ3 Service Manual page 30

( d) Tighten camshaft thrust plate to crankcase by using
machining holes in camshaft gear.
(9 ) Install the idler gear as follows:
(a) Install idler gear by matching the timing mark
on each gear.
(b) Inspecting valve timing after installation of
timing gears
It is not necessary to check the valve timing,
provided that all matching marks on the timing
gears are aligned. Check the timing for verification
as follows:
Using a 3 mm (0.12 in.) thick smooth steel plate,
add 3 mm (0.12 in.) clearance to intake and ex­
haust valves of No. 1 cylinder. Then, insert a 0.05
mm (0.0020 in.) thickness gauge into between the
top of valve cap and rocker, and slowly turn the
crankshaft, trying to find a position where the
thickness gauge is firmly gripped (the valve starts
opening) and a position where the gauge is just
ungripped (the valve starts closing). Check to
make sure.that these positions coincide with the
angular positions shown in the valve timing dia­
gram with 3 mm (0.12 in.) clearance added to
the valves.
Timing gear match marks meeting each other
1-Camshaft gear
2-Cran kshaft gear
t
Direction of rotation
Exhaust
Valve timing diagram
Valve timing diagram with 3 mm (0.12 in.)
clearance added to valves
3-ldler gear
4-lnjection pump gear
BOC
TDC
Intak e
BOC