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Mazda X-5. Manual - part 13

MECHANICAL

01–10–3

01–10

CYLINDER BLOCK CONSTRUCTION [LF]

E5U011010300N01

• The cylinder block is made of aluminum alloy, which is cast with the cast iron liner, improving heat radiation and

decreasing weight.

• The cylinder block is a deep skirt type and forms the ladder frame structure with the integrated main bearing

cap. The water jacket of the cylinder block is a closed deck type. Its higher rigidity reduces vibration and noise.

• The cylinder block has the oil separator cover on the opposite side of the fresh air intake, the PCV (positive

crankcase ventilation) valve is installed in the oil separator. Together they function to improve blow-by gas
ventilation efficiency.

• There is no positioning tab where the upper and lower main bearings are installed.

• The main bearing cap bolts are

torque-to-yield type and cannot be reused.

• The service hole for installing the SST, which is

used for detecting the No.1 cylinder TDC position,
is located at the right side of the cylinder block.
The TDC position can be detected when the SST
edge touches the cutting surface of the No.1
counter weight.

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OIL SEPARATOR COVER

CYLINDER BLOCK

MAIN BEARING CAP

PCV VALVE

OIL SEPARATOR COVER ATTACHMENT PART

E5U110ZT5009

NO.1 CYLINDER

CRANKSHAFT COUNTER

SERVICE HOLE

CYLINDER BLOCK

NO.1 PISTON

NO.1 CYLINDER TDC POSITION

SST

E5U110ZT5010

MECHANICAL

01–10–4

CRANKSHAFT, MAIN BEARING CONSTRUCTION [LF]

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• A five axle-hole, 4 counter weight cast iron

crankshafts have been adopted.

• There is no positioning key where the crankshaft

sprocket and crankshaft pulley are installed. The
crankshaft sprocket must be installed using the
SST with the No.1 cylinder aligned with TDC
position. Tightening pressure on the tightening
bolt is used to secure the crankshaft sprocket and
crankshaft pulley.

• An oil line for supplying oil to each journal is

provided in the crankshaft. Crank pins and fillets
on both sides of the journal are rolled to bear
heavy loads.

• Upper and lower main bearings are made of aluminum alloy and the upper side No.3 journal bearing is

integrated with the thrust bearing. The upper main bearing has oil grooves and oil holes.

• There is no upper and lower bearings' positioning tab for installing the main journal.

• Measure and attach the main bearings (upper and lower) so that they are positioned at the center the main

bearing cap.

• Three kinds of main bearings are available depending on the oil clearance.

Bearings

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E5U110ZT5001

OIL PASSAGE

FILLET ROLL AREA

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MAIN BEARING CAP

MAIN BEARING

SUPPLYING ENGINE OIL

THRUST BEARING

LOWER MAIN BEARING

UPPER MAIN
BEARING

UPPER MAIN BEARING

2 HOLES SUPPLYING
ENGINE OIL

E5U110ZT5011

Bearing size

Bearing thickness (mm {in})

upper

lower

STD

2.501—2.522 {0.0985—0.0992}

2.501—2.529 {0.0985—0.0995}

0.25OS

2.623—2.629 {0.1033—0.1035}

2.624—2.630 {0.1034—0.1035}

0.50OS

2.748—2.754 {0.1082—0.1084}

2.749—2.755 {0.1083—0.1084}

MECHANICAL

01–10–5

01–10

CRANKSHAFT PULLEY CONSTRUCTION [LF]

E5U011011371N01

• The crankshaft position (CKP) signal detecting blade has been adopted for the crankshaft pulley. The torsional

damper, which prevents the crankshaft from wobbling, has also been adopted for the crankshaft.

• There is no positioning key slot on the crankshaft pulley. Instead, the positioning hole on the crankshaft pulley

and the engine front cover are used for aligning the crankshaft pulley with the crankshaft.

• Crankshaft pulley bolt is

torque-to-yield type to be tightened in two steps to insure crankshaft pulley tightening

stability

and cannot be reused.

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ENGINE FRONT COVER CONSTRUCTION [LF]

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• The engine front cover is made of aluminum alloy, and is integrated with the No.3 engine-mounting bracket, to

improve noise absorption and weight reduction.

• The bolt hole for crankshaft pulley positioning, the service hole for unlocking the chain adjuster ratchet, and the

service hole for securing the tensioner arm when loosening the timing chain, are on the engine front cover.

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SECTIONAL VIEW

TORSIONAL DAMPER

BRAID FOR CKP SENSOR
SIGNAL DETECTION

ELEVATION VIEW

HOLE FOR PULLEY POSITIONING

E5U110ZT5012

BACK VIEW

FRONT VIEW

SERVICE HOLE FOR
TENSIONER ARM
FIXATION

SERVICE HOLE FOR CHAIN
TENSIONER LOCK RELEASE

BOLT HOLE CRANKSHAFT
PULLEY POSITIONING

E5U110ZT5042

MECHANICAL

01–10–6

PISTON, PISTON RING, PISTON PIN CONSTRUCTION [LF]

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• The pistons are made of aluminium alloy, which withstands heat and is highly conductive.

• The piston skirt is coated with graphite to reduce friction.

• The offset pistons are used to reduce piston-slapping noise.

• To prevent the piston from being reassembled in the wrong direction, the front mark (←) is on the piston.

• Pistons and connecting rods cannot be disassembled because they are shrinkage fit.

Piston Specification.

• The following piston rings have been adopted:

Barrel face ring for top ring, taper under cut ring
for second ring, two scuff rings and an expander
for oil ring.

• The piston pin is made of chrome steel alloy,

which has superior rigidity.

• The connecting rod and the piston pin are

shrinkage fit, so that it cannot be disassembled.

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item

Specification

Outer diameter

mm {in}

87.465—87.495 {3.4435—3.4435}

Offset quantity

mm {in}

0.8 {0.04}

Compression height: A

mm {in}

28.5 {1.122}

Piston height: B

mm {in}

51.0 {2.0078}

PISTON SIDE VIEW

OFFSET

OUTER DIAMETER

PISTON UPPER VIEW

INSTALL ARROW
FACING ENGINE
FRONT

ENGINE
FRONT
SIDE

VALVE RISES

E5U110ZT5043

TOP RING SECTIONAL VIEW

EXPANDER

SIDE RAIL

OIL RING SECTIONAL VIEW

SECOND RING SECTIONAL VIEW

E5U110ZT5013

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