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Automotive Engines

Automotive Engines. Part 6 (Valvetrain). Valvetrain. The collection of parts operate the valves. The Valvetrain includes the various parts that convert the camshaft's rotary motion into reciprocating motion at the valves, and the valves and their associated parts. These parts include:. 5.

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Automotive Engines

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  1. Automotive Engines Part 6 (Valvetrain)

  2. Valvetrain • The collection of parts operate the valves. • The Valvetrain includes the various parts that convert the camshaft's rotary motion into reciprocating motion at the valves, and the valves and their associated parts. • These parts include:

  3. 5 Valvetrain 4 6 • Cam • Lobe • Lifter • Push Rod • Rocker Arm • Valve 3 1 2

  4. Valvetrain Parts Cont. • Seals, Retainers/Rotators, Keepers • Rocker Arms, Followers, Push Rods • Guides, Seats, etc.

  5. Cyl. Head Parts • Guides • Seats • Valves • Springs • Cups (Al. Heads) • Retainers • Seals • Keepers • Rockers

  6. Valves • Made of: • Steel • Stainless • Titanium

  7. Valve Spring • Generally a coil of wire, that closes the valve after it has been opened by the cam, and prevents the valve from bouncing on its seat.

  8. Valve Retainer/Rotator • Retainer • Connects Valve to spring • Rotator • Rotates Exhaust Valves to eliminate hot spots

  9. Valve Spring Keepers • Cone shaped wedges hold retainers to valves

  10. Rocker Arm • A reciprocating lever, generally used to multiply valve lift

  11. Follower (OHC) • Follower: Similar to a Rocker Arm • Lifter • Valve • Lobe 4 2 1 3

  12. Shim & Bucket (OHC) • Cam Acts on Valve • Shim is removable • Adjusts lash

  13. Pushrods • Transfer lifter motion to rocker arm. • Most are hollow to transfer oil to valves & rockers.

  14. Valvetrain – The End

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