ENGINE <4G6> -
On-vehicle Service
11A-13
<LASH ADJUSTER SIMPLE CHECK>
1. Stop the engine.
2. Remove the rocker cover.
3. Set the No.1 cylinder to the compression top dead centre
position.
4. Check the rocker arms indicated by white arrows in the
illustration by the procedures given below.
<Checking an intake-side rocker arm>
Check whether the rocker arm moves downwards when
the part of the rocker arm which touches the top of the
lash adjuster is pushed.
D
If the rocker arm moves down easily when it is pushed,
make a note of which is the corresponding lash
adjuster.
D
If the rocker arm feels extremely stiff when it is pushed
and does not move down, the lash adjuster is normal,
so check for some other cause of the problem.
<Checking an exhaust-side rocker arm>
NOTE
It will not be possible to depress the Y-shaped rocker
arm at the exhaust valve side if one lash adjuster is
defective but the other one is normal. In such cases,
carry out the following procedure using a thickness gauge.
(1) Check that a thickness gauge with a thickness of
0.1 - 0.2 mm can be inserted easily between the
valve and the lash adjuster.
(2) If the thickness gauge can be inserted easily, make
a note of which is the corresponding lash adjuster.
(3) If the thickness gauge cannot be inserted easily, the
lash adjuster is normal, so check for some other cause
of the problem.
5. Slowly turn the crankshaft 360
_
in the clockwise direction.
6. Check the rocker arms indicated by black arrows in the
illustration in the same way as explained in step 4.
<LASH ADJUSTER AIR BLEEDING>
NOTE
(1) If the vehicle is parked on a slope for a long period
of time, the amount of oil inside the lash adjuster
will decrease, and air may get into the high pressure
chamber when starting the engine.
(2) After parking the vehicle for long periods, the oil drains
out of the oil passage, and it takes time for the oil
to be supplied to the lash adjuster, so air can get
into the high pressure chamber.
(3) If either of the above situations occur, the abnormal
noise can be eliminated by bleeding the air from inside
the lash adjusters.
