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STEP 1
Before starting the crankcase pressure test, it is important to run the engine until it reaches normal operating temperature. A cold engine will produce an abnormally high pressure reading.
STEP 2
Install the crankcase orifice restrictor tool in a road draft tube or a crankcase pressure test adapter in the oil fill hole. Use the manufacturer’s prescribed tool and restriction diameters.
STEP 3
Ensure that the oil dipstick tube seal and any other gaskets and seals on the engine are sealing properly.
STEP 4
Connect the Magnehelic gauge with plastic tubing to the restriction tool. There are two ports on the gauge, pressure and vacuum; connect the orifice port to the gauge pressure port.
STEP 5
Make sure that the gauge tubing is clean and dry so that the gauge does not become damaged. It is good practice to blow clean, dry compressed air through the tubing before each use.
STEP 6
Zero the Magnehelic gauge.
STEP 7
Chock the wheels of the vehicle and apply the brakes. Place the transmission in neutral or park.
STEP 8
Start the vehicle’s engine and run it at wide-open throttle under no load. Maintain this engine speed for at least 30 seconds to observe and record a stabilized reading. Make sure that the hole in the top of the crankcase orifice restrictor tool is never blocked when the engine is running.
STEP 9
Record your results and compare them against specifications. Any reading of more than 4" (102 mm) of water during the crankcase pressure test indicates a worn engine. It is likely that base engine mechanical concerns exist.
STEP 10
Make a service recommendation to overhaul the engine if engine hours and distance traveled are high.
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