ENGINE MECHANICAL
EM-1
ENGINE MECHANICAL – Description, Operation
DESCRIPTION
The 2VZ–FE engine is a V–6, 2.5 liter, DOHC 24–valve engine.
OPERATION
EM-2
ENGINE MECHANICAL – Description, Operation
DESCRIPTION
The 2VZ–FE engine is a V–6, 2.5 liter, DOHC 24–valve engine.
OPERATION
EM-2
ENGINE MECHANICAL – Description, Operation
The 2VZ–FE engine has 6 cylinder in a V arrangement at a bank angle of 60°. From the front of the RH bank
cylinders are numbered 1 – 3 – 5, and from the front of the LH bank cylinders are numbered 2 – 4 – 6. The crank-
shaft is supported by 4 bearings inside the crankcase. These bearings are made of copper and lead alloy.
The crankshaft is integrated with 5 weights for balance. Oil holes are placed in the center of the crankshaft
for supplying oil to the connecting rods, pistons and other components.
This engine’s ignition order is 1 – 2 – 3 – 4 – 5 – 6. The cylinder head is made of aluminum alloy, with a cross
flow type intake and exhaust layout and with pent–roof type combustion chambers. The spark plugs are located
in the center of the combustion chambers.
At the front and rear of the intake port of the intake manifold, a water passage has been provided which con-
nects the RH and LH cylinder heads.
Exhaust and intake valves are equipped with irregular pitch springs made of special valve spring carbon steel
which are capable of functioning no matter what the engine speed.
The RH and LH intake camshafts are driven by a single timing belt, and a gear on the intake camshaft en-
gages with a gear on the exhaust camshaft to drive it. The camshaft journal is supported at 5 (intake) or 4 (ex-
haust) places between the valve lifters of each cylinder and on the front end of the cylinder head. Lubrication
of the cam journals and gears is accomplished by oil being supplied through the oiler port in the center of the
camshaft.
Adjustment of the valve clearance is done by means of an outer shim type system, in which valve adjusting
shims are located above the valve lifters. This permits replacement of the shims without removal of the cam-
shafts.
The timing belt cover is composed of the resin type No.2 and No.1 above and below the engine RH mounting
bracket.
Pistons are made of high temperature–resistant aluminum alloy, and a depression is built into the piston head
to prevent interference with the valves.
Piston pins are the semi–floating type, with the pins fastened to the connecting rods by pressure fitting, allow-
ing the pistons and pins to float.
The No.1 compression ring is made of steel and the No.2 compression ring is made of cast iron. The oil ring
is made of a combination of steel and stainless steel. The outer diameter of each piston ring is slightly larger
than the diameter of the piston and the flexibility of the rings allows them to hug the cylinder walls when they
are mounted on the piston. Compression rings No.1 and No.2 work to prevent gas leakage from the cylinder
and the oil ring works to clear oil off the cylinder walls to prevent it from entering the combustion chamber.
The cylinder block is made of cast iron with a bank angle of 60°. It has 6 cylinders which are approximately
twice the length of the piston stroke. The top of the cylinders is closed off by the cylinder heads and the lower
end of the cylinders becomes the crankcase, in which the crankshaft is installed. In addition, the cylinder block
contains a water jacket, through which coolant is pumped to cool the cylinders.
The oil pan is bolted onto the bottom of the cylinder block. The oil pan is an oil reservoir made of pressed
steel sheet. A dividing plate is included inside the oil pan to keep sufficient oil in the bottom of the oil pan even
when the vehicle is tilted. This dividing plate also prevents the oil from making waves when the vehicle is stopped
suddenly and thus shifting the oil away from the oil pump suction pipe.
EM-3
ENGINE MECHANICAL – Operation
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