Mazda X-5. Manual — part 13
MECHANICAL
01–10–3
01–10
CYLINDER BLOCK CONSTRUCTION [LF]
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• 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
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NO.1 CYLINDER
CRANKSHAFT COUNTER
SERVICE HOLE
CYLINDER BLOCK
NO.1 PISTON
NO.1 CYLINDER TDC POSITION
SST
SST
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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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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
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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]
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• 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
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BACK VIEW
FRONT VIEW
SERVICE HOLE FOR
TENSIONER ARM
FIXATION
SERVICE HOLE FOR CHAIN
TENSIONER LOCK RELEASE
BOLT HOLE CRANKSHAFT
PULLEY POSITIONING
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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}
A
B
PISTON SIDE VIEW
OFFSET
OUTER DIAMETER
PISTON UPPER VIEW
INSTALL ARROW
FACING ENGINE
FRONT
ENGINE
FRONT
SIDE
VALVE RISES
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TOP RING SECTIONAL VIEW
EXPANDER
SIDE RAIL
OIL RING SECTIONAL VIEW
SECOND RING SECTIONAL VIEW
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