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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mazda 3 (2003 release)

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Mazda 3
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Mazda
3
Operation and maintenance of car
Engine
General description new engines models L8, LF, L3
The mechanical part of engines
Cylinder head cover
Cylinder Head
Cylinder head gasket
Cylinder block
The crankshaft and main bearing
Balancing unit
The principle of operation of the balancing unit
Vibration damper crankshaft
Engine Front Cover
Piston
Piston rings and piston pin
The connecting rod and connecting rod bearing
The valve mechanism - general information
Camshaft
Camshaft sprocket
Crankshaft sprocket
Timing chain drive
Chain tensioner timing
Valve, valve springs, valve stem seal, Valve Guides
Tappet
Variable valve timing mechanism
Lubrication system
Cooling system
Fuel system
Exhaust and Emission
Electric motors
The mechanical part of engines
Appendix 1
Annex 2
Appendix 3
Engine Z6 - mechanical part
Lubrication system
Cooling system
Intake system
Fuel system
Exhaust and Emission
Ignition system
Control system
Tables
Transmission
Chassis
Steering Gear
Brakes
Onboard electric
Body
 


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The crankshaft and main bearing



Crankshaft engine models L8, LF, L3
Fig. 2.8. Crankshaft engine models L8, LF, and L3: 1 - driving gear


Crankshafts and engine models L8 LF - 5-iron support with 4 counterweights. The crankshaft of the engine model L3 - 5-iron support with 8 counterweights. Pinion drive balancing shaft is mounted on the crankshaft. Normal installation key is not used, torque the crankshaft pulley bolt locks the crankshaft sprocket. When installing the crankshaft sprocket is necessary to use a special tool to install the TDC of the first cylinder (Fig. 2.8).

An oil passage of the crankshaft
Fig. 2.9. An oil passage of the crankshaft 1 - oil passage; 2 - fillet



Oil line for supplying oil to the main journal of the crankshaft is located on the crankshaft. Cervical and fillet crankshaft journals hardened knurled to improve the load characteristics.

The upper and lower liners and main bearing
Fig. 2.10. The upper and lower liners and main bearing: 1 - the cylinder head bolts; 2 - side of the issue; 3 - Intake side; 4 - the front part of the engine; 5 - the angle between the two flaps; 6 - the inlet channel; 7 - the inlet channel


The upper and lower main bearing shells are made of aluminum alloy. Upper bearing ?��3 - resistant. Upper liners have oil grooves and oil ducts. Mounting protrusions of upper and lower inserts are absent. Before installing the upper and lower main bearing shells you must measure them and set them up so that they are located in the center of the bearing cover (Fig. 2.10).




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Balancing unit

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