Daihatsu F300 Service Manual page 1171

ENGINE MECHANICALS
5. Pull out the injector relay and fuel pump relay from the relay
block.
6. Measurement of cylinder compression pressure
(1) Insert a compression gauge into the spark plug hole.
(2) Depress the accelerator pedal fully.
(3) While cranking the engine, measure the compression
pressure.
NOTE:
• Always use a fully charged battery so that at least a
revolution speed of 300 rpm is attained.
(4) Repeat the steps (1) through (3) for each cylinder.
NOTE:
Perform the measurement in the shortest possible time.
• Crank the engine for the same duration for each cylinder.
Compression Pressure:
1373 kPa (14 kgf/cm
2
)/at 300 rpm
Minimum Pressure:
1 030 kPa (1 0.5
kgf/cm~/at
300 rpm
Difference Between Cylinders:
147 kPa (1.5 kgf/cm
2
)/at 3.00 rpm
(5) If the compression of one or more cylinders is low, pour
a small amount of engine oil into that cylinder through
the spark plug hole and repeat the steps (1) through ( 4)
for the cylinder with low compression.
• If adding oil helps the compression to improve,
chances are that the piston rings and/or cylinder
bores are worn or damaged.
• If the pressure remains low after the operation
described in the step (5) has been performed, the
valve may be sticking or seated improperly, or there
may be leakage past the gasket.
7. Install the injector relay and fuel pump relay to the relay
block.
EM-30
•
WFE9Q.CM073
•
•