Presentation on theme: "Automotive Engines Part 6 (Valvetrain). Valvetrain The collection of parts operate the valves. The Valvetrain includes the various parts that convert."— Presentation transcript:
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:
Valvetrain 1. Cam 2. Lobe 3. Lifter 4. Push Rod 5. Rocker Arm 6. Valve
Valvetrain Parts Cont. Seals, Retainers/Rotators, Keepers Rocker Arms, Followers, Push Rods Guides, Seats, etc.
Cyl. Head Parts Guides Seats Valves Springs Cups (Al. Heads) Retainers Seals Keepers Rockers
Valves Made of: – Steel – Stainless – Titanium
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.
Valve Retainer/Rotator Retainer – Connects Valve to spring Rotator – Rotates Exhaust Valves to eliminate hot spots
Valve Spring Keepers Cone shaped wedges hold retainers to valves
Rocker Arm A reciprocating lever, generally used to multiply valve lift
Follower (OHC) 1. Follower: Similar to a Rocker Arm 2. Lifter 3. Valve 4. Lobe
Shim & Bucket (OHC) Cam Acts on Valve Shim is removable Adjusts lash
Pushrods Transfer lifter motion to rocker arm. Most are hollow to transfer oil to valves & rockers.