Special Tool(s)
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
| Adapter, Compression Test 303-1515 |
- Make sure the oil in the crankcase is the correct viscosity and at the correct level.
- Operate the engine until it is at normal operating temperature. Turn the ignition switch to the OFF position.
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NOTE: Failure to remove all the glow plugs may result in inconsistent test results.
Remove the glow plugs. For additional information, refer to GLOW PLUG SYSTEM - 6.7L DIESEL .
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NOTE: The battery charger must be left connected during the compression test and disconnected when the test is complete.
Connect a battery charger to the battery.
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NOTE: Engine shown removed for clarity.NOTE: It may be necessary to install a commercially available adapter fitting to connect the Compression Test Adapter to the commercially available diesel compression gauge.
Install the Compression Test Adapter and a commercially available diesel engine compression gauge.
- Install an auxiliary starter switch to the starting circuit. With the ignition switch in the OFF position, crank the engine a consistent number of strokes (minimum of 2 compression strokes to 12 compression strokes). Record the readings.
- Repeat the test on each cylinder, cranking the engine the same number of compression strokes, record the readings. Compare the readings of the 8 cylinders.
- There must be a minimum cylinder pressure of 2068.4 kpa (300 psi) and have no more than a 20% difference from the average on any given cylinder.
- Investigate and repair any cylinder(s) that are outside of the 20% range.
- Install the glow plugs. For additional information, refer to GLOW PLUG SYSTEM - 6.7L DIESEL .