MAJOR MAINTENANCE
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2.1.7. Intercooler
The intercooler is air to air type and has a large cooling fan capacity. The intercooler life and performance
depends on the intake air condition greatly. Fouled air pollutes and clogs the air fins of intercooler. As a result
of this, the engine output is decreased and engine malfunction is occurred. So you always check whether the
intake air systems like air filter element are worn or polluted.
2.1.8. Valve clearance adjust procedure
z
After letting the #1 cylinder’s piston come at the compression top dead center by turning the crankshaft,
adjust the valve clearances.
z
Loosen the lock nuts of rocker arm adjusting screws and push the feeler gauge of specified value between
a rocker arm and a valve stem and adjust the clearance with adjusting screw respectively and then tighten
with the lock nut.
z
As for the valve clearance, adjust it when in cold, as follow.
1) Rotate the crankshaft to overlap the intake and the exhaust valves of #6, then #1 cylinderbecome the
compression state of top dead center.
2) Therefore adjust the valve clearance corresponding to
" "
of lower figure. At this time there are no
force on the push rods of #1 cylinder.
3) Rotating the crankshaft by one revolution, #6 cylinder become the compression state of top dead center.
4) Thereafter adjust the valve clearances corresponding to
" "
of lower figure.
5) After reinsuring the valve clearances, retighten if necessary.
Model Intake Valve Exhaust Valve
DE12
DE12T
DE12TI
DE12TIS
0.3 mm 0.3 mm
EA5O4003
Air flow by cooling fan
Hot air by turbo charger
compressor
Cooled air to intake
manifold (max. 50 C)
Air/air intercooler
with radiator
(combined radiator)
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