Gauge Check

AllData Editors Note - Ford does not provide a cranking pressure specification, only an acceptable range.

Before performing the Engine Compression Test, check the battery. The battery must be fully charged, in good condition and properly connected. If the battery is not fully charged, recharge or replace it.

1. Run the engine until it reaches normal operating temperature.
2. Turn the engine off.
3. Remove the spark plugs.
4. Disconnect the 4-pin distributor connector and the ignition coil electrical connector to eliminate fuel flow and spark.








5. Install Rotunda Quick Disconnect Compression Tester 134-R0212 or equivalent, tightly into the spark plug hole.
6. To maximize air flow depress the accelerator pedal to Wide Open Throttle (WOT) while cranking the engine.
7. Normally, the first compression stroke wilt run the gauge indicator needle a considerable distance up the scale. Succeeding strokes will raise it slightly more until the highest level is shown (this will require at least four or five compression strokes). Record the highest reading.
8. Repeat steps 5-7 above for each cylinder and compare the readings with the specifications. Test Results