Mazda X-5. Manual - part 15

MECHANICAL 

01–10–11

01–10

• The detection unit (trigger plate) for the camshaft 

position (CMP) sensor is at the intake port side 
camshaft.

• The groove for securing the No.1 cylinder TDC for 

the camshaft, is provided at the rear of the intake 
and exhaust camshaft.

End Of Sie

5˚

30˚

62˚

32˚

42˚

TDC

EX

IN

BDC

VARIABLE DOMAIN

VARIABLE 
DOMAIN

0˚

E5U110ZT5004

CAM JOURNAL

CAM HEEL

CAM NOSE

INTAKE CAMSHAFT

EXHAUST CAMSHAFT

THRUST

THRUST

CAM HEEL

CAM JOURNAL

CAM NOSE

E5U110ZT5017

DETECTION
PART FOR
CKP SENSORS

SST

E5U110ZT5044

MECHANICAL 

01–10–12

CAMSHAFT SPROCKET CONSTRUCTION [LF]

E5U011012420N02

• The sintered alloy, which has high rigidity, has been adopted for the camshaft sprocket and is quenched to 

improve the abrasion resistance at the contact point with the timing chain.

• The intake camshaft sprocket is integrated (cannot be disassembled) with the variable valve timing actuator.

End Of Sie

CRANKSHAFT SPROCKET CONSTRUCTION [LF]

E5U011012420N03

• High-strength chromium steel has been adopted for the crankshaft sprocket. Due to carbonizing protection, 

abrasion resistance at all chain contact points is increased. 

• The crankshaft sprocket consists of the timing chain sprocket and oil pump sprocket, which are 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

CAMSHAFT SPROCKET

VARIABLE VALVE TIMING 
ACTUATOR

E5U110ZT5005

item Specification

Outer diameter

(mm {in})

About

47.955 {1.8880}

Tooth width

(mm {in})

About

7.35 {0.289}

item

Specification

Outer diameter 

(mm {in})

About

47.955 {1.8880}

Tooth width

(mm {in})

About

6.15 {0.242}

ENGINE FRONT

TOOTH WIDTH

OUTER
DIAMETER

TIMING CHAIN DRIVE SPROCKET

OIL PUMP DRIVE SPROCKET

E5U110ZT5018

MECHANICAL 

01–10–13

01–10

TIMING CHAIN, CHAIN TENSIONER CONSTRUCTION [LF]

E5U011012040N01

• A silent chain (link grounding type) type has been adopted for the timing chain to reduce tapping noise caused 

by matching each sprocket.

• 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.

• Oil pressure type chain tensioner has been adopted for the timing chain tensioner. The tension of the timing 

chain is maintained constant, using the oil pressure and the spring force in the chain tensioner.

• The oil pressure type chain tensioner consists of the following parts: Piston spring, which depresses the 

tensioner arm, check ball which maintains pressure to the tensioner arm.

End Of Sie

item

Specification

Pitch size

(mm {in})

8 {0.32}

CAMSHAFT SPROCKET

CHAIN TENSIONER

CHAIN GUIDE

PIN

PITCH SIZE

TIMING CHAIN

CRANKSHAFT SPROCKET

TENSIONER ARM

E5U110ZT5006

OIL SUPPLY HOLE

CHECK BALL

PISTON SPRING

PISTON

RACK

RATCHET

RATCHET SPRING

CROSS-SECTION 

HOLE FOR A RATCHET LOCK

E5U110ZT5019

MECHANICAL 

01–10–14

TAPPET CONSTRUCTION [LF]

E5U011012431N01

• The tappet is a shimless tappet which is integrated with the shim.

• The tappet surface is phosphate-coated to smooth the attaching surface to the cam and improve abrasion 

resistance.

• The valve clearance can be adjusted by replacing the tappet. There are 35 kinds of tappets depending on the 

thickness. The tappet kind can be determined by the engraved identification mark (3 digits).

Tappet Specification.

End Of Sie

VARIABLE VALVE TIMING MECHANISM OUTLINE [LF]

E5U011012111N04

• A variable timing mechanism, which realizes optimum valve timing according to engine operation conditions by 

continuously modifying the phases of the intake camshaft and crankshaft, has been adopted. 

Discernment mark

Tappet thickness (mm {in})

The number of jumps (mm {in})

725—625

3.725—3.625 {0.1467—0.1427}

0.025 {0.00098}

602—122

3.602—3.122 {0.1418—0.1229}

0.02 {0.00078}

100—000

3.100—3.000 {0.1220—0.1181}

0.025 {0.00098}

TAPPET

CAMSHAFT 

TAPPET SECTIONAL VIEW

CAM LOB CONTACT 
SURFACE

VALVE STEM 
CONTACT SURFACE

IDENTIFICATION MARK POSITION

E5U110ZT5020

TORQUE

ENGINE SPEED

LOW-MIDDLE SPEED ENGINE

HIGH SPEED ENGINE

ENGINE WITH VARIABLE VALVE TIMING MECHANISM

E5U110ZT5021