🔍 Key Concepts

• Cam profile and camshaft function in a diesel engine valve train • How valve timing, lift, and motion profile are produced mechanically • Relationship between cam shape and valve movement (via follower, pushrod, rocker)

💭 Think About

• Ask yourself: what exactly does changing the cam’s shape (its profile) physically change about how the follower and valve move over one revolution? • Consider whether a cam with a different profile could change only when the valve starts to move, or also how far and how fast it moves. • Think about whether valve timing, valve lift, and valve opening speed are independent of each other or all influenced by the cam profile.

✅ Before You Answer

• Verify which aspects of valve motion are directly controlled by the cam lobe profile and which might be set by other adjustments (like lash/clearance). • Check whether timing (point of opening), lift, and rate/speed of opening can all be altered by regrinding or redesigning the cam lobe. • Confirm that the question says, "valves set to specification," meaning the clearance is correct, so only the cam shape is the variable.