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:
Flywheel Inspection [C66 M R]
1. Remove the flywheel..
2. Perform the following procedures to inspect the flywheel.
If there is any malfunction or it exceeds the maximum specification, replace
the flywheel..
a. Inspect the surface that contacts the clutch disc for scratches, nicks, and
discoloration.
...
Auto Leveling Sensor Inspection
1. Disconnect the negative battery cable..
2. Remove the auto leveling sensor..
3. Prepare three dry cell batteries (1.5 V).
4. Connect the three dry cell batteries in a series.
5. Connect the positive pole of the dry cell battery to auto leveling sensor
terminal C, and the negative po ...
Oil Pan
Purpose, Function
The engine oil required for lubrication in the engine accumulates in the
oil pan.
Construction
The oil pan is installed on the lower part of the cylinder block.
Silicone sealant with excellent sealing has been adopted for the oil pan
gask ...
