COMPRESSION INSPECTION
1. Warm up the engine.
Standard: coolant temperature
75
to
85
OC
(167
to
185
OF)
2.
Remove the intake pipe.
3.
Disconnect the glow plug wiring and remove the glow
plug.
4.
Disconnect the fuel cut solenoid connector.
5.
Measure the compression.
Note:
Run the starter to empty the cylinder before measuring
the compression.
(1)
Fit the compression gauge attachment to the glow
plug hole, and connect the compression gauge to the
attachment.
(2)
Crank the engine and measure the compression
pressure. (at
260
rpm)
Standard:
2850
kPa
(29.0
kgf/cm2)
[412
psi]
Limit:
2000
kPa
(20.0
kgf/cm2)
[284
psi]
Note:
Use the same number of compression strokes for
each cylinder. For example, if ten compression
strokes are necessary to obtain the maximum
pressure for No.1 cylinder, also use ten strokes for the
other cylinders.
Use a fully charged battery to maintain the specified
engine speed.
(3)
Measure the compression pressure for each cylinder.
Limit of difference between cylinders:
200
kPa
(2
kgf/cm2)
[28
psi]
(4)
If the compression pressure in any cylinder is below
the limit, or if the differential pressure between any
two cylinders is larger than the limit, add a small
amount of the engine oil from the nozzle case and
repeat steps
(I) to
(3).
(a)
If the pressure increases after adding the oil,
the piston ring andlor the cylinder wall may be
worn.
(b)
If the pressure remains low after adding the
oil, there may be a valve seizure, poor valve
contact or pressure leakage from the gasket.
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