Automotive Engines

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Automotive Engines Part 6 (Valvetrain)

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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. - PowerPoint PPT Presentation

Transcript of Automotive Engines

Page 1: Automotive Engines

Automotive Engines

Part 6 (Valvetrain)

Page 2: Automotive Engines

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:

Page 3: Automotive Engines

Valvetrain

1. Cam

2. Lobe

3. Lifter

4. Push Rod

5. Rocker Arm

6. Valve 1

2

3

4

5

6

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Valvetrain Parts Cont.

Seals, Retainers/Rotators, Keepers Rocker Arms, Followers, Push Rods Guides, Seats, etc.

Page 5: Automotive Engines

Cyl. Head Parts

Guides Seats Valves Springs Cups (Al. Heads) Retainers Seals Keepers Rockers

Page 6: Automotive Engines

Valves

Made of:– Steel– Stainless– Titanium

Page 7: Automotive Engines

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.

Page 8: Automotive Engines

Valve Retainer/Rotator

Retainer– Connects Valve to spring

Rotator– Rotates Exhaust Valves

to eliminate hot spots

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Valve Spring Keepers

Cone shaped wedges hold retainers to valves

Page 10: Automotive Engines

Rocker Arm

A reciprocating lever, generally used to multiply valve lift

Page 11: Automotive Engines

Follower (OHC)

1. Follower: Similar to a Rocker Arm

2. Lifter

3. Valve

4. Lobe

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3

4

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Shim & Bucket (OHC)

Cam Acts on Valve Shim is removable Adjusts lash

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Pushrods

Transfer lifter motion to rocker arm.

Most are hollow to transfer oil to valves & rockers.

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Valvetrain – The End