OPERATIONS INSIDE THE ENGINE COMPARTMENT
PERIODIC INSPECTION AND MAINTENANCE
2-12
VALVE CLEARANCE CHECK AND
ADJUSTMENT <4M40>
NOTE: Perform the valve clearance check and
adjustment at the engine cold state.
1. Remove the rocker cover.
2. Remove the glow plug plate and all of the glow
plugs from the cylinder head.
CAUTION
Never turn the crankshaft anticlockwise (the
opposite direction) as the tensioner, which adjust
the timing chain tension at the timing gear, may
be damaged. If so, remove and reinstall the ten-
sioner.
3. Align the notch of the crankshaft pulley with the
"0" timing mark to set the No. 1 or No. 4 cylinder
to the compression top dead centre position.
NOTE: If the dent on the camshaft is pointing directly
upwards, the No. 1 cylinder will be at the compres-
sion top dead centre position. If the crankshaft is
then turned once, the No. 4 cylinder will then be at
the compression top dead centre position.
4. Check the valve clearances at the places by
arrows in the illustration by the following
procedure.
White arrow: When No. 1 cylinder is at compression
top dead centre position
Black arrow: When No. 4 cylinder is at compression
top dead centre position
(1) Use a thickness gauge to measure the valve
clearance. If deviated from standard value,
make a note for the valve clearance.
Standard valve (Cold engine):
Intake side 0.15
−
0.25 mm
Exhaust side 0.25
−
0.35 mm
NOTE: There should be certain amount of
resistance against the thickness gauge when
taking the measurements. If the thickness
gauge is moving too smoothly, a correct meas-
urement cannot be obtained.
(2) Use the measured values as a reference for
selecting adjustment shims which will bring the
incorrect valve clearance to the standard
value.
A: thickness of newly installed shim
B: thickness of removed shim
C: measured valve clearance
Equation
Intake valve: A = B + (C
−
0.2) mm
Exhaust valve: A = B + (C
−
0.3) mm
NOTE: The thicknesses of the adjustment
shims are between 2,250
−
3,150 mm (37types
which increase in thickness by 0.025 mm)
AK601576AB
"0"
Crankshaft pulley
AK601577AB
Dent
AK603846AB
Intake
No. 1
Intake
No. 2
Intake
No. 3
Intake
No. 4
Exhaust
No. 1
Exhaust
No. 2
Exhaust
No. 3
Exhaust
No. 4
AK603982AB
Valve
clearance
Summary of Contents for PAJERO IV
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