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
...
Other materials:
Front Side Frame Installation [Panel Replacement]
Symbol Mark
Installation Procedure
1. When installing new parts, measure and adjust the body as necessary to conform
with standard dimensions.
2. Drill holes for the plug welding before installing the new parts.
3. After temporarily installing new parts, make sure the related parts fit p ...
Rear Seat Back Removal/Installation
CAUTION:
When removing or putting in the rear seat, contact with the surrounding areas
of the vehicle could cause scratches and damage. When removing or putting in
the rear seat, always use two or more persons to perform the work and be careful
not to scratch or damage the rear seat ...
Drive Belt
Purpose, Function
The drive belt transmits rotation force of the crankshaft pulley to the pulley
for the auxiliary parts.
Construction
The drive belt is installed to the front of the engine.
A V-ribbed belt has been adopted for the drive belt.
The wat ...
