Mazda CX-5 Service & Repair Manual: Crankshaft, Main Bearing
Purpose, Function
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The crankshaft converts the reciprocating movement of the piston to a rotational movement via the connecting rod.
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The main bearing forms an oil film on the outer surface of the crankshaft journal to prevent wear due to sliding.
Construction
Crankshaft
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The crankshaft is installed to the inside (crankcase) of the cylinder block.
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The crankshaft has a key groove to match timing to the crankshaft pulley.
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The crankshaft has the following parts shown in the figure.
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The optimized shaft diameter ratio of the crankshaft journal and crank pin has reduced sliding resistance while maintaining rigidity.
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The steel crankshaft has five bearings and eight counterweights for improved accuracy in the rotational balance.
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The crankshaft journal and crank pin have been induction hardened* to bear high loads.
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The crankshaft has an oil passage for supplying engine oil to the crankshaft journal and crank pin.
Main bearing
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The main bearing is installed to the outer surface of the crankshaft journal.
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The upper main bearing and lower main bearing are made of aluminum alloy.
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The upper main bearing has an oil groove and oil hole.
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Thrust force is suppressed by the thrust bearings on both sides of the No.3 journal.
Crankshaft Position (CKP) Sensor
Purpose/Function
Detects the crankshaft speed as basic information for mainly determining
the fuel injection timing and ignition timing.
Detects the crankshaft speed and inputs it to ...
Motor Mounts
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Other materials:
Front Door Latch Switch
Purpose, Function
Switches on/off in conjunction with the latch lever rotation, and detects
the front door open/closed condition by the voltage which is changed by the
rear body control module (RBCM).
Construction
The switch is turned on/off by the rotation of the latch lev ...
Traction Control System (TCS)
The Traction Control System (TCS) enhances traction and safety by controlling
engine torque and braking.
When the TCS detects driving wheel slippage, it lowers engine torque and operates
the brakes to prevent loss of traction.
This means that on a slick surface, the engine adjusts automaticall ...
Fuel and Engine Exhaust Precautions
Fuel Requirements
Vehicles with catalytic converters or oxygen sensors must use ONLY UNLEADED FUEL,
which will reduce exhaust emissions and keep spark plug fouling to a minimum.
Your Mazda will perform best with fuel listed in the table.
Fuel with a rating lower than 87 octane (91 RON) could ...
