Valve Train Components Cleaning and Inspection. Buick Roadmaster 1996

For 1990-2009 cars

#### Tools Required

J 8520 Camshaft Lobe Lift Indicator

Inspect the following areas:

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- Inspect the valve rocker arms and ball at the mating surfaces. These surfaces should be smooth and free of scoring or other damage.

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- Inspect the valve rocker arm valve pushrod sockets and valve stem mating surfaces. These surfaces should be smooth with no scoring or exceptional wear.

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- Inspect the valve pushrods for scored ends or bends.

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- The camshaft and crankshaft sprockets for wear

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- One edge of worn teeth or that are no longer concentric

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- The valley between worn teeth

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- The key and crankshaft keyway for wear

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- The crankshaft timing chain for binding

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- Measure the camshaft lobe lift.

0.1. | Position the J 8520 with the ball socket adapter on the valve pushrod. Be sure that the valve pushrod is in the valve lifter socket.

0.2. | Slowly rotate the crankshaft until the valve lifter roller is on the heel of the cam lobe. The valve pushrod will be in its lowest position.

0.3. | Set the J 8520 on zero.

0.4. | Slowly rotate the crankshaft until the valve pushrod is raised fully.

0.5. | Compare the total lift shown on the J 8520 with the specifications.

0.6. | Remove the J 8520 .