Mazda 6. Manual - part 8

VALVE MECHANISM 

B–21

B

.

End Of Sie

AME2211N005

AME2211N006

1

Intake camshaft

2

Exhaust camshaft

3

Thrust

4

Cam nose

5

Cam journal

6

Cam heel

7

Detection part for CKP sensors

8

SST

B–22

VALVE MECHANISM 

CAMSHAFT SPROCKET

A6E221112420T02

Structure

•

The sintered alloy, which has high rigidity, has been adopted for the camshaft sprocket and has been 
quenched to improve the abrasion resistance at the contact point with the timing chain.

•

 L3 engine models intake port side camshaft sprocket is integrated (cannot be disassembled) with the variable 
valve timing actuator.

.

End Of Sie

AME2211N009

1

Camshaft sprocket

2

Variable valve timing actuator 

VALVE MECHANISM 

B–23

B

CRANKSHAFT SPROCKET

A6E221112420T03

Structure

•

High-strength chromium steel has been adopted for the crankshaft sprocket. Due to carburizing protection, 
abrasion resistance at all chain contact points is increased. 

•

The crankshaft sprocket consists of the timing chain sprocket and oil pump sprocket, which have been 
integrated into a single unit.

•

The keyway on the crankshaft sprocket, used to position the crankshaft during installation, has been 
eliminated.

Timing Drive Sprocket Specification.

Oil Pump Drive Sprocket Specification.

.

End Of Sie

ITEM L8

LF

L3

Outer diameter

(mm {in})

About

47.955 {1.8880}

About

48.495

 {1.9093}

Tooth width

(mm {in})

About

7.35 {0.289}

About

8.03

{0.316}

ITEM

L8

LF

L3 

Outer diameter 

(mm {in})

About

47.955 {1.8880}

About

48.495

 {1.9093}

Tooth width

(mm {in})

About

6.15 {0.242}

About

5.93 {0.242}

AME2211N010

1

Oil pump drive sprocket

2

Timing chain drive sprocket

3

Engine front

4

Outer diameter 

5

Tooth width 

B–24

VALVE MECHANISM 

TIMING CHAIN, CHAIN TENSIONER

A6E221112040T01

Structure

•

The timing chain is the silent chain (link grounding type), by which the tapping noise caused by matching each 
sprocket is reduced.

•

Engine oil inside the engine front cover lubricates the timing chain and each sprocket. The pin part of the timing 
chain is nitrite-treated to improve abrasion resistance.

Timing Chain Specification.

.

•

The timing chain tensioner is the oil pressure type chain tensioner. The tension of the timing chain is kept 
constant, using the oil pressure and the spring force in the chain tensioner.

•

The tension of the timing chain is kept constant by the oil pressure and the piston spring force.

•

The oil pressure type chain tensioner is configured with the following parts: Piston spring, which depresses the 
tensioner arm, Check ball which maintains pressing in the tensioner arm.

ITEM

L8

LF

L3 

Pitch size

(mm {in})

8 {0.32}

6.35 {0.25}

Pitch number

134

174

AME2211N002

1

Camshaft sprocket

2

Tensioner arm

3

Chain tensioner

4

Chain guide

5

Crankshaft sprocket

6

Timing  chain

7

Pitch size

8

Pitch

9

Link

AME2211N003