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Home › Ford › 1997 › RV Cutaway 7.3 F › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests - 7.3L Diesel › Engine Performance Diagnosis › Crankcase Pressure Test

Crankcase Pressure Test

  1. Ensure engine is at normal operating temperature. Remove turbocharger inlet pipe ducting. Remove inlet pipe and elbow that connects to air filter housing. Using cap provided in Engine Pressure Tester (014-00761), block air filter housing outlet. Install a protective screen over turbocharger inlet.
  2. Screw Crankcase Orifice Restrictor (5631) and Crankcase Pressure Test Adapter (014-00743) into oil fill cap hole. Connect adapter to pressure gauge (No. 4) at Engine Pressure Tester (014-00761). Ensure gauge has been zeroed.
  3. Observe gauge and raise engine speed to 3400 RPM for about 30 seconds. DO NOT block hole at top of crankcase orifice restrictor. Pressure should be less than 4 in. H2O. If pressure is 4 in. H2O or more, check engine mechanical condition (compression rings, cylinder bores, valves, etc.). Repair as necessary.
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