Mazda 6. Manual — part 8
VALVE MECHANISM
B–21
B
.
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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.
.
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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.
.
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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
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