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1.Before inspection, check
that the engine oil, starter and battery are normal. In
addition,
set the vehicle to the pre-inspection condition.
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2.Turn the ignition switch
to "LOCK" (OFF) position.
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3.Remove all of the glow
plugs (Refer to GROUP 16 - Glow System, Glow Plug ).
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4.Disconnect the injector
connector of all cylinders.
note |
Doing this will prevent
carrying out fuel injection.
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5.
caution |
- Keep away from the glow
plug hole when cranking.
- If compression is measured with water,
oil, fuel, etc., that has come from
cracks
inside the cylinder, these materials
will become heated and will gush out
from glow plug hole,
which is dangerous.
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Cover the glow plug hole with a shop towel etc., and
after the engine has been cranked,
check that no foreign material is adhering to the shop
towel.
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![](../../../img/11/AK802494AB00ENG.png)
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6.
caution |
Install special tool
compression press test adapter (MB992285),
tighten to the torque that is less than the
tightening torque (18 ± 2 N· m)
of the glow plug.
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Install the special tool to the glow plug
installation hole and install the compression
gauge. 7.Crank the engine and measure the
compression pressure. Standard value (at engine
speed of 200 r/min): 2,400 kPa Limit (at engine speed
of 200 r/min): Minimum 1,700 kPa 8.Measure
the compression pressure for all the cylinders, and check
that the pressure
differences of the cylinders are below the
limit. Limit (at engine speed of 200 r/min):
Maximum 300 kPa 9.If there is a cylinder
with compression or a compression difference that is outside
the limit, pour a small amount of engine oil through the
glow plug hole, and repeat the operations
in steps from 6 to 8. (1)
If the compression increases after oil is added, the cause
of the malfunction is a
worn or damaged piston ring and/or cylinder inner
surface. (2)
If the compression does not rise after oil is added, the
cause is a burnt or defective
valve seat, or pressure is leaking from the
gasket. 10.Turn the ignition switch to "LOCK"
(OFF) position. 11.Connect the injector connector
of all cylinders. 12.Install the glow plugs (Refer
to GROUP 16 - Glow System, Glow Plug ). 13.Turn
the ignition switch to the "LOCK" (OFF) position and then
connect the M.U.T.-III
to the diagnosis connector (Refer to GROUP 00 -
Precautions Before Service, M.U.T.-III ). 14.Use
the M.U.T.-III to erase the diagnosis codes.
note |
This will erase the diagnosis
code resulting from the injector connector being
disconnected.
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