Technician A states that to check cam lift, the camshaft must be removed from the engine to obtain a valid reading. Technician B states that to check for a bent camshaft, the camshaft should be removed from the engine and runout tested in V-blocks. Who is correct

Question:

The options are;

a. Technician A only

b. Technician B only

c. Both A and B

d. Neither A nor B

The correct option is;

c. Both A and B

Explanation:

The measurement obtained while checking the cam lift with a dial indicator while the camshaft is in the engine might be at variance or be different from what the O. E. M. (Original Equipment Manufacturer) requires, that is the measurement are may not be valid. Therefore, it is important that the camshaft be removed from the engine for proper measurement to take place

To check for a bent camshaft, the camshaft is installed in v-blocks and a dial indicator is used to check for variance of the camshaft features with a reference to a datum as the camshaft is rotated 360 ° around the axis of the datum. That is the camshaft is datum tested.

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