Kia Cadenza: Engine Mechanical System / Compression Test
Compression Pressure Inspection |
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure. |
1. |
Warm up engine until the normal operating temperature(80~95°C(176-203°F)). |
2. |
Remove the surge tank.
(Refer to Intake And Exhaust System - "Surge Tank") |
3. |
Remove the ignition coils.
(Refer to Engine Electrical System - "Ignition Coil") |
4. |
Remove the spark plugs.
(Refer to Engine Electrical System - "Spark Plug") |
5. |
Check cylinder compression pressure.
(1) |
Insert a compression gauge into the spark plug hole. |
(2) |
Fully open the throttle. |
(3) |
Crank the engine over 7 times to measure compression pressure.
Always use a fully charged battery to obtain engine speed of 250 rpm or more. |
|
(4) |
Repeat step 1) though 3) for each cylinder.
This measurement must be done in as short a time as possible. |
Compression pressure :
1,029kPa (10.5kgf/cm², 149psi) (250~400 rpm)
Minimum pressure :
882kPa (9.0kgf/cm², 128psi)
Difference between each cylinder :
98kPa (1.0kg/cm², 14psi) or less
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|
(5) |
If the cylinder compression in 1 or more cylinders is low,
pour a small amount of engine oil into the cylinder through the spark
plug hole and repeat step 1) through 3) for cylinders with low
compression.
a. |
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. |
b. |
If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket. |
|
|
6. |
Reinstall the spark plugs.
(Refer to Engine Electrical System - "Spark Plug") |
7. |
Install the ignition coils and ignition connectors.
(Refer to Engine Electrical System - "Ignition Coil") |
8. |
Install the surge tank.
(Refer to Intake And Exhaust System - "Surge Tank") |
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Troubleshooting
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Other information:
Components
1. Screw2. Blot3. Limiter Assembly4. Retainer Ring5. Pulley6. Compressor Assembly
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