Mazda CX-5 Service & Repair Manual: Crankshaft, Main Bearing
Purpose, Function
-
The crankshaft converts the reciprocating movement of the piston to a rotational movement via the connecting rod.
-
The main bearing forms an oil film on the outer surface of the crankshaft journal to prevent wear due to sliding.
Construction
Crankshaft
-
The crankshaft is installed to the inside (crankcase) of the cylinder block.
-
The crankshaft has a key groove to match timing to the crankshaft pulley.
-
The crankshaft has the following parts shown in the figure.
-
The optimized shaft diameter ratio of the crankshaft journal and crank pin has reduced sliding resistance while maintaining rigidity.
-
The steel crankshaft has five bearings and eight counterweights for improved accuracy in the rotational balance.
-
The crankshaft journal and crank pin have been induction hardened* to bear high loads.
-
The crankshaft has an oil passage for supplying engine oil to the crankshaft journal and crank pin.
Main bearing
-
The main bearing is installed to the outer surface of the crankshaft journal.
-
The upper main bearing and lower main bearing are made of aluminum alloy.
-
The upper main bearing has an oil groove and oil hole.
-
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:
Auto Light Sensor
Purpose
The auto light sensor detects the illumination level above and in front of
the vehicle and outputs it to the front body control module (FBCM).
Function
The auto-light sensor uses the upward illumination level sensor to detect
the illumination level above the vehicle ...
Filament Repair
1. Clean the filament using isopropyl alcohol.
2. Attach tape to both sides of the filament.
3. Using a small brush or marking pen, apply silver paint.
4. After 2—3 min, carefully remove the tape without damaging the applied
area.
CAUTION:
Do not operate the rear window defro ...
Fuel Tank Inspection
WARNING:
Fuel is very flammable liquid. If fuel spills or leaks from the pressurized
fuel system, it will cause serious injury or death and facility breakage. Fuel
can also irritate skin and eyes. To prevent this, always complete the “Fuel
Line Safety Procedure”, while referring ...
