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Valve Spring Strength

WARNING: This page is about a different car, the 2012 Ford Flex. However, it is still accessible from the selected car via links, so may be relevant.
SPECIAL TOOLS

G08042375
Pressure Gauge, Valve/Clutch Spring
303-006 (TOOL-6513-DD) or equivalent
NOTE: Refer to the SPECIFICATIONS for 3.5L & SPECIFICATIONS for 3.5L GDTI for the specification.
  1. Use the Valve/Clutch Spring Pressure Gauge to check the valve spring for correct strength at the specified valve spring length.
    Fig 1: Checking Valve Spring Correct Strength Using Valve/Clutch Spring Pressure Gauge
    G08042376Courtesy of FORD MOTOR CO.