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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2471 (Engine Mechanical - 6.4L 99R Diesel -- F250-F550 Super Duty) >> General Procedures >> Cylinder Head Distortion >> Cylinder Head Distortion Check

Cylinder Head Distortion Check

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Do not measure for cylinder head distortion along the length, across the full width, or across a diagonal of the cylinder head. These types of measurement will provide inaccurate results.
    Fig 1: Measuring Only Inboard Surface Of Cylinder Head, From Push Rod Openings To Outer Edge Of Exhaust Side Of Cylinder Head
    G06142978Courtesy of FORD MOTOR CO.
  1. Measure only the inboard surface of the cylinder head, from the push rod openings to the outer edge of the exhaust side of the cylinder head.
    2. NOTE: When checking the 13 locations on the combustion chamber sealing surface, keep the Feeler Gauge Set away from the valves area as they may lead to incorrect measurements
    Fig 2: Identifying Combustion Chamber Sealing Points
    G06142979Courtesy of FORD MOTOR CO.
  2. Check for distortion only at the 13 locations shown in the illustration.
    3. NOTE: Avoid running the tip of the Feeler Gauge Set into the Gauge Bar (or straightedge). This may cause damage to, or distort the tip of, the Feeler Gauge Set. The result may be inaccurate readings.
    NOTE: If the Gauge Bar is not available, use a calibrated straightedge that is calibrated by the manufacturer to be flat within 0.0127 mm (0.0005 in) per running foot length, such as a Snap-On® GA438A, or equivalent.
    Fig 3: Placing Feeler Gauge On Cylinder Head
    G06142980Courtesy of FORD MOTOR CO.
  3. Place the 0.1 mm (0.004 in) feeler gauge on the cylinder head at one of the specified locations. Then place the Gauge Bar (or straightedge) on top of the feeler gauge. Lightly press on the center of the Gauge Bar (or straightedge) while checking the measurement.
  4. Attempt to pull the feeler gauge out from under the Gauge Bar (or straightedge).
    Fig 4: Pulling Feeler Gauge Out From Under Gauge Bar
    G06142981Courtesy of FORD MOTOR CO.
    5. NOTE: If a location is measured to be out of specification, verify that all carbon deposits that may influence measurement accuracy have been removed with a brass scraper and re-measure.
    NOTE: The cylinder heads used on the diesel engine cannot be resurfaced. Do not attempt to machine or resurface the cylinder heads.
  5. If the 0.1 mm (0.004 in) feeler gauge can be easily pulled out from under the Gauge Bar (or straightedge) without resistance, the cylinder head is out of specification and must be replaced.
  6. Repeat the cylinder head distortion measurement at each of the 13 locations shown in the illustration.
    Fig 5: Identifying Combustion Chamber Sealing Points
    G06142979Courtesy of FORD MOTOR CO.
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