Valve Train Analysis - Camshaft Lobe Lift

Engine

Valve Train Analysis - Camshaft Lobe Lift

Valve Train Analysis - Camshaft Lobe Lift, 2.3L

Check the lift of each lobe in consecutive order and make a note of the readings.

1. Remove the valve cover. Refer to Engine.

2. Remove the spark plugs. Refer to Ignition System.

3. Install the Dial Indicator Gauge with Holding Fixture so the rounded tip of indicator is on top of the camshaft lobe.

4. Rotate the crankshaft using a breaker bar and a socket attached to the crankshaft pulley bolt. Rotate the crankshaft until the base circle of the camshaft lobe is reached.

Typical Engine With Valve Tappets





5. Zero the Dial Indicator. Continue to rotate the crankshaft until the high-lift point of the camshaft lobe is in the fully-raised position (highest indicated reading).

6. To check the accuracy of the original indicator reading, continue to rotate the crankshaft until he vase circle is reached. The indicator reading should be zero. If a zero reading is not obtained, repeat the measurement.

7. If the lift on any camshaft lobe is below specified service limits, install a new camshaft and valve tappets. Refer to Engine.

8. Install the spark plugs. Refer to Ignition System.

9. Install the valve cover. Refer to Ignition System.

Valve Train Analysis - Camshaft Lobe Lift, 4.0L SOHC Engines

Check the lift of each camshaft lobe in consecutive order and make a note of the readings.

1. Remove the valve covers. Refer to Engine.

2. Remove the spark plugs. Refer to Ignition System.

3. Install the Dial Indicator Gauge with Holding Fixture so the rounded tip of indicator is on top of the camshaft lobe.

4. Rotate the crankshaft using a breaker bar and socket attached to the crankshaft pulley bolt. Rotate the crankshaft until the base circle of the camshaft lobe is reached.

Typical Engine With Camshaft Roller Followers





5. Zero the Dial Indicator. Continue to rotate the crankshaft until the (1) high-lift point of the camshaft lobe is in the fully-raised position (highest indicator reading).

6. To check the accuracy of the original indicator reading, continue to rotate crankshaft until the (2) base circle is reached. The indicator reading should be zero. If zero reading is not obtained, repeat the measurement.

7. If the lift on any lobe is below specified service limits, install a new camshaft, and new camshaft roller followers. Refer to Engine.

8. Install the spark plugs. Refer to Ignition System.

9. Install the valve covers. Refer to Engine.