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Special Tool(s)

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
SPECIAL TOOLS

G07480757
 Adapter, Compression Test
303-1515
  1. Make sure the oil in the crankcase is the correct viscosity and at the correct level.
  2. Operate the engine until it is at normal operating temperature. Turn the ignition switch to the OFF position.
    3. NOTE: Failure to remove all the glow plugs may result in inconsistent test results.
  3. Remove the glow plugs. For additional information, refer to GLOW PLUG SYSTEM - 6.7L DIESEL article.
    4. NOTE: The battery charger must be left connected during the compression test and disconnected when the test is complete.
  4. Connect a battery charger to the battery.
    5. NOTE: Engine shown in illustration 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.
    Fig 1: Installing Compression Test Adapter And Commercially Available Diesel Engine Compression Gauge
    G07480758Courtesy of FORD MOTOR CO.
  5. Install the Compression Test Adapter and a commercially available diesel engine compression gauge.
  6. 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.
  7. 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.
  8. Investigate and repair any cylinder(s) that are outside of the 20% range.
  9. Install the glow plugs. For additional information, refer to GLOW PLUG SYSTEM - 6.7L DIESEL article.
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