Engine Compression Test
Special Tools
EN-48248 Cylinder Compression Pressure Gauge
For equivalent regional tools, refer to
Special Tools .
Removal Procedure
| 3. |
Remove the relay holder
cover. |
| 4. |
Remove the fuel pump
relay. |
|
Note: The engine
cranking time for the compression test should be less then 10
seconds and at 30 second intervals.
|
| 5. |
Crank the engine with the
starter motor for 5 seconds to remove any foreign substances from
the cylinders. |
| 6. |
Prior to taking a compression
reading, verify the cranking speed is greater than 300 RPM. If the
cranking speed is below 300 RPM, repair the slow cranking speed
condition before continuing with the compression test. |
| 7. |
Install EN-48248
gauge in the spark plug bore for the cylinder that is being
checked. |
| 8. |
Using the vehicle's starter
motor, rotate or crank the engine for 4 compression strokes, puffs,
for the cylinder being tested. |
| 9. |
Observe the compression gauge
and note the reading as the compression test is being performed. A
normal cylinder reading will be indicated if compression builds up
quickly and evenly to the specified level. An abnormal reading will
be indicated if compression is low on the first compression stroke,
starts increasing on the following compression strokes but does not
reach the specified level. |
| 10. |
Record the compression reading
for the cylinder just tested. |
| 11. |
Repeat steps for all remaining
cylinders. All 4 cylinders must be tested to obtain valid test
results. Record the readings. |
| 12. |
Maximum pressure differential
100 kPa (14.5 psi). |
Installation Procedure
| 1. |
Install the fuel pump
relay. |
| 2. |
Install the relay holder
cover. |
|
