BASE ENGINE



CYLINDER HEAD








VALVE SEAT


The valve stem seals use springs with good seal performance to prevent oil draining down.
The oversize valve guides are available as spare parts: 0.3.

VALVE GUIDE


A sintered alloy material is used for the valve guides.
The three kinds of the oversize valve guides are available as spare parts: 0.05, 0.25 and 0.50.

CYLINDER HEAD GASKET






ROCKER COVER



A lightweight resin material is used for the cylinder gasket cover.

CYLINDER BLOCK







Items
Specifications
Bore mm
87.6
Bore pitch mm
98
Stroke mm
82.9

The cylinders are offset from the center of the crankshaft.

PISTON



Special aluminum alloy is adopted to improve heat efficiency and achieve lower weight.
That contributes to higher engine performance and better fuel economy. Piston pinhole center is offset by 0.5 mm from piston center towards the thrust side.
Out side surface of piston skirt has striation-like finishing better oil holding ability (and superior durability against scuffing.)
Items
Specifications
Basic diameter mm
87.6
Pin hole diameter mm
22
Overall height mm
47.78

PISTON PIN



Semi-floating piston pin is adopted. Piston pin is into the small end of connecting rod so that it floats in piston.
Items
Specifications
Outer diameter (D) mm
22
Inner diameter (d1) mm
13.5
Inner diameter (d2) mm
12.5
Overall length (h) mm
58

PISTON RING





Items
Piston ring No.1
Piston ring No.2
Oil ring
Shape
Inside bevel, Barrel
Taper
3-piece, Barrel
Surface treatment (cylinder contact surface)
Chrome nitride (PVD)
Parkerizing + resin coating
Hard plated Parkerizing
Supplier mark
1T
2T
None

CONNECTING ROD



High strength carbon steel (forging) material is adopted.
Rod has "H" shaped cross section.
Big-end is lubricated through crankshaft oil passage between main journal and pin.
Items
Specifications
Small end hole diameter (d) mm
22
Big end hole diameter (D) mm
56
Center-to-center distance (L) mm
145

CONNECTING BEARING



Upper and lower bearings are same parts.
This part consists of overlay (surface), copper alloy plate (middle) and steel plate (back side).
To reduce friction loss, width of connecting rod bearing is designed as short as possible composed with crankshaft journal.
Items
Specifications
Width (H) mm
14.4
Thickness (A) mm
1.5

CRANKSHAFT









Items
Specifications
Pin outer diameter mm
53
Journal outer diameter mm
69

CRANKSHAFT BEARING AND THRUST BEARING






Items
Specifications
Crankshaft bearing
Width mm
18.5
Thickness mm
2.0
Crankshaft thrust bearing
Thickness mm
2.0

CRANKSHAFT PULLEY



The outer ring has 6-rib for power steering pump and 4-rib for alternator and air-compressor drive belt.
Timing mark notch is applied at the flange of 4-rib side.

DRIVE PLATE



The drive plate is made of sheet metal.
The drive plate is mounted with 8 bolts.

TIMING BELT








VALVE





Items
Intake valve
Exhaust valve
Head diameter (D) mm
35.0
29.5
Stem diameter (d) mm
6.0
6.0
Overall length (L) mm
111.84
114.04

VALVE STEM SEAL


Oil is prevented from seeping down by using a good sealing spring on the valve stem seal.

VALVE SPRINGS



To prevent surging during high speed, variable pitch springs are used.
Items
Intake valve
Exhaust valve
Free height (h) mm
59.15
57.7
Total number of windings
10.61
9.39

CAMSHAFT



The camshaft has the two kinds of the cams, for high speed and low speed, at the intake side.
Items
Cam height mm
A: Intake low speed cam
37.28
B: Intake low speed cam
36.23
C: Exhaust cam
37.84

MITSUBISHI INNOVATIVE VALVE TIMING AND LIFTING ELECTRONIC CONTROL SYSTEM (MIVEC)



















OIL FEEDER CONTROL VALVE