BASE ENGINE



CYLINDER HEAD RELATION




1.CYLINDER HEAD COVER

2.PCV VALVE
3.FRONT CAMSHAFT BEARING CAP

4.CAMSHAFT BEARING CAP

5.CAMSHAFT BEARING
6.OIL FEEDER CONTROL VALVE
7.OIL FEEDER CONTROL VALVE FILTER
8.CYLINDER HEAD

9.CYLINDER HEAD GASKET

10.VALVE GUIDE

11.VALVE SEAT

12.CAMSHAFT POSITION SENSOR

CYLINDER BLOCK




A cylinder block made of an aluminium alloy has been adopted for weight reduction.
Five bearings are provided for the crankshaft journals and the No. 3 bearing sustains the thrust load of the crankshaft.
The water jacket is the full Siamese type.
1.CYLINDER BLOCK

Item
4B11
4B12
Overall height mm
230.1
240.1
Bore mm
86
88
Bore pitch mm
96
96
Stroke mm
86
97
2.CRANKSHAFT BEARING CAP

3.LADDERFRAME

PISTON RELATION




1.PISTON

2.PISTON PIN

3.CONNECTING ROD

4.PISTON RING

5.CONNECTING ROD BEARING


CRANKSHAFT RELATION




1.CRANK SHAFT

2.CRANKSHAFT BEARING

3.THRUST BEARING

4.CRANKSHAFT PULLEY

5.CRANKSHAFT SENSING RING
The crankshaft is also fitted with a crankshaft sensing ring.
6.DRIVE PLATE


TIMING CHAIN RELATION




1.OIL SEAL

2.TIMING CHAIN CASE

3.TIMING CHAIN

4.TIMING CHAIN TENSIONER

5.TENSIOR LEVER ASSEMBLY
6.CHAIN GUIDE ASSEMBLY
7.CAMSHAFT SPROCKET EXHAUST
8.V.V.T. CAMSHAFT SPROCKET

VALVE RELATION




The valve mechanism is based on a 4-valve DOHC (Double Over Head Camshaft) design having the camshaft on the upper valve. Each cylinder has two intake valves and two exhaust valves, arranged in a V-shape pattern.
Camshaft rotation is transmitted via valve tappets to the respective valves which open and close accordingly.
1.CAMSHAFT
2.VALVE TAPPET

3.VALVE

4.VALVE STEM SEAL

5.VALVE SPRING


MIVEC (MITSUBISHI INNOVATIVE VALVE TIMING ELECTRONIC CONTROL SYSTEM) RELATION




MIVEC (Mitsubishi Innovative Valve timing Electronic Control system) consists of the components illustrated above.
The intake valve timing is optimally controlled (continuously variable) under the changing driving conditions to improve performance in the entire speed range.

V.V.T. SPROCKET (VARIABLE VALVE TIMING SPROCKET)




Oil from the oil feeder control valve is sent to the V.V.T. sprocket, moving the vane rotor and thus regulating the valve timing.

CAMSHAFT




The lightweight camshaft is achieved by the hollow design.
Oil channels run through the intake camshaft, through which oil is sent from the oil feeder control valve to the V.V.T. sprocket.
A cam position sensing ring is press-fitted onto the rear portion of the intake camshaft.

OIL FEEDER CONTROL VALVE (OCV)




The oil feeder control valve is essentially a solenoid valve, regulated by the engine-ECU signals to feed oil to the V.V.T. sprocket assembly to move the vane rotor.

BALANCER RELATION<4B12>




1.BALANCER TIMING CHAIN

2.CRANKSHAFT SPROCKET
3.BALANCER TIMING CHAIN TENSIONER
4.BALANCER CHAIN GUIDE
5.BALANCER TENSIONER LEVER
6.BALANCER SHAFT MODULE ASSEMBLY