Mazda 6. Manual — part 6
ENGINE
B–13
B
PISTON, PISTON RING, PISTON PIN
A6E222411010T01
Structure
•
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.
•
L3 engine models piston has a valve recess.
Piston Specification.
.
•
The following piston rings are used. Top ring: barrel face ring, Second ring: taper under cut ring, Oil ring: two
scuff rings and an expander.
•
The piston pin is made of chrome steel alloy, which has superior rigidity.
•
The connecting rod and the piston pin are shrinkage fit, and cannot be disassembled.
ITEM
L8
LF
L3
Outer diameter
mm {in}
82.965—82.995
{3.2664—3.2675}
87.465—87.495
{3.4435—3.4435}
87.465—87.495
{3.4435—3.4435}
Offset quantity
mm {in}
0.8 {0.04}
0.8 {0.04}
0.8 {0.04}
Compression
height:HC
mm {in}
28.5 {1.122}
28.5 {1.122}
28.5 {1.122}
Piston height: HD
mm {in}
51.0 {2.0078}
51.0 {2.0078}
51.0 {2.0078}
AME2224N008
1
Piston side view
2
Offset
3
Outer diameter
4
Piston upper surface view
5
Install arrow facing engine front
6
Engine front side
7
Valve rises
B–14
ENGINE
.
End Of Sie
CONNECTING ROD, CONNECTING ROD BEARING
A6E222411211T01
Structure
•
Connecting rod is made of structural sintered alloy to improve rigidity.
•
The connecting rod, the piston, and the piston pin are shrinkage fit, and cannot be disassembled.
•
The connecting rod bolt is the plastic region tightening bolt, which is tightened in two steps to insure a stable
axis during tightening.
•
The conventional positioning tab has been decommissioned for the connecting rod bearing. When installing the
bearing, measure the position of the bearing so that the position gets to the center of the connecting rod and
the bearing cap, and install it.
•
The big end of the connecting rod and the connecting rod cap were originally formed as a single unit and then
it was cut into the connecting rod and the cap. Using the form of the cutting surface, align the connecting rod
and the cap.
.
AME2224N009
1
Top ring sectional view
2
Second ring sectional view
3
Oil ring sectional view
4
Side rail
5
Expander
5
4
3
1
2
4
2.3
—
2.7 mm
{0.09
—
0.10 in}
AME2224N010
1
Enlargement
2
Connecting rod
ENGINE
B–15
B
•
The upper lower bearing of the connecting rod bearing is made of aluminum alloy.
•
There are three kinds of connecting rod bearings depending on the oil clearance.
End Of Sie
DRIVE BELT
A6E222415800T01
Structure
•
The drive belt is a serpentine type, which uses a V-ribbed belt to drive the supplemental units. This shortens
the length of engine and makes it easier to service.
•
The front drive belt's auto tensioner, in which the coil spring is embedded, has been adopted for the drive belt's
tension. The tensioner pulley automatically maintains the drive belt's tension.
Drive Belt Specification.
( ) is A/C non-equipping vehicle specification.
.
End Of Sie
3
Fracture side
4
Connecting rod bearing cap
5
Connecting rod bearing
Bearing size
Color
Bearing thickness (mm {in})
Standard
Green
1.496—1.502
{0.0589—0.0591}
0.50 {0.02}
Oversize
1.748—1.754 {0.0688—0.0690}
0.25 {0.01}
Oversize
1.623—1.629 {0.0639—0.0641}
ITEM
L8
LF
L3
Belt length size
mm {in}
About 2,255 {88.78}
(About 2,160 {85.04})
About 2,305 {90.75}
(About 2,210 {87.01})
Belt width size
mm {in}
About 20.5 {0.81}
AME2224N013
1
P/S oil pump pulley
2
Drive belt
3
Idler pulley
4
Generator pulley
5
Front drive belt auto tensioner
6
Crankshaft pulley
7
A/C compressor pulley
8
Water pump pulley
B–16
ENGINE
ENGINE MOUNT
A6E222439000T03
Outline
•
The layout of the engine mounting is pendulum type, which reduces the noise in the cabin.
•
The engine supported at three points, and simplification of engine mount composition parts is attained.
•
The No.3 engine mounting rubber, which is an oil-filled type, has been adopted to reduce the noise in the
cabin.
•
The surface of No.3 engine joint bracket and the No.1 engine-mounting rubber is made of aluminum alloy to
decrease weight.
.
AME2224N014
1
No.3 engine joint bracket
2
No.3 engine mount rubber
3
No.1 engine mount rubber
4
No.1 engine mount bracket
5
No.4 engine mount bracket
6
No.4 engine mount rubber
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