1hd-Fte-Engine.pdf

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108
ENGINE
– 1HD-FTE ENGINE
1HD-FTE ENGINE
JDESCRIPTION
Based on the previous 1HD-FT engine, the 1HD-FTE engine has adopted an electronically controlled injec-
tion pump and an intercooler and has undergone improvements in the various areas of the engine to improve
the engine performance and fuel economy while reducing exhaust emissions. At the same time, this engine
contributes to the vehicle’s quieter operation and improved reliability.
147EG28
147EG27
ENGINE
– 1HD-FTE ENGINE
109
JENGINE
SPECIFICATIONS AND PERFORMANCE CURVE
Engine
Item
No. of Cyls. & Arrangement
Valve Mechanism
Combustion Chamber
Manifolds
Fuel System
Displacement
Bore
x
Stroke
Compression Ratio
Max. Output
Max. Torque
Intake
Valve
Timing
Exhaust
Intercooler
Fuel Cetane Number
Oil Grade
: 1HD-FTE
: 1HD-FT
[EEC]
Open
Close
Open
Close
cm
3
(cu. in.)
mm (in.)
1HD-FTE
6-Cylinder, In-Line
24-Valve, OHC,
Belt & Gear Drive
Direct Injection Type
Cross-Flow
Distributor Type
(Electronically Controlled)
4164 (254.0)
94.0
x
100.0 (3.70
x
3.94)
18.8 : 1
150 kW @ 3400 rpm
12_ BTDC
24_ ABDC
54_ BBDC
12_ ATDC
With
48 or higher
API CF-4
[EEC] 430 N
.
m @ 1400
X
3200 rpm
1HD-FT
z
z
z
z
Distributor Type
(Mechanically Controlled)
z
z
18.6 : 1
125 kW @ 3600 rpm
380 N
.
m @ 2500 rpm
z
32_ ABDC
z
z
N.A.
z
API CD or Better
EG
kW
160
140
N
.
m
450
Torque
400
350
300
250
120
100
80
60
40
20
0
1000
2000
3000
4000 5000 rpm
147EG30
Engine Speed
Output
110
ENGINE
– 1HD-FTE ENGINE
JMAJOR
DIFFERENCES
Major differences of the new 1HD-FTE engine and previous 1HD-FT engine are listed below.
Item
Features
D
A cylinder head cover made of resin has been adopted for weight
reduction and low-noise operation.
D
The rigidity of the cylinder block has been improved to reduce noise and
vibration.
D
Newly designed pistons have been adopted to improve the engine
performance and reliability.
D
The crankshaft has been made highly rigid to reduce noise and vibration.
D
The crankshaft bearings have been machine-bored to improve their
reliability.
D
An aluminum radiator core is used for weight reduction.
D
A step-up linear type temperature controlled fluid coupling has been
adopted to improve cooling performance.
D
A high-performance oil filter element has been adopted to improve the
cleanliness of the engine oil.
D
The oil capacity of the engine has been increased to improve its reliability.
D
A drip pan is provided on the oil cooler cover to improving serviceability.
D
A ball joint has been adopted in the front exhaust pipe to reduce noise and
vibration.
D
An oxidation catalytic converter has been adopted in the front exhaust
pipe to reduce exhaust emissions.
D
A compact turbocharger has been adopted to attain a widely ranging
high-efficiency region from the low- to the high-speed range.
D
An intercooler has been adopted to improve engine performance.
D
A radial plunger type electronically controlled injection pump that
produces a high injection pressure has been adopted to improve the engine
performance while reducing exhaust emissions.
D
The injection nozzles have been optimized to improve the engine
performance and reduce exhaust emissions.
The 12/24 volt switchover system has been discontinued to simplify the
wiring system.
D
An electronic fuel injection system has been adopted.
D
M-OBD (Multiplex On-Board Diagnosis) system is adopted.
Engine Proper
Cooling System
Lubrication System
Intake and Exhaust
System
Turbocharger System
Fuel System
Starting System
Engine Control
System
ENGINE
– 1HD-FTE ENGINE
111
JENGINE
PROPER
1. Cylinder Head Cover
D
The No.1 cylinder head cover is made of resin, adopts a curved shape, and has optimally allocated ribs
for weight reduction and reduced noise.
D
Spaced bolts are used for fastening the cylinder head covers. In addition, vibration isolating washers con-
taining laminated layers of rubber and aluminum sheets have been adopted to achieve a floating retaining
construction that reduces noise and improves reliability.
D
The blowby gas passage in the cylinder head cover has adopted a maze-like configuration to minimize the
consumption of engine oil through blowby gas.
D
A No.2 cylinder head cover has been adopted. The No.2 cylinder head cover, which is made of iron sheet,
is completely covered with foam rubber on the inside. A vibration isolating rubber gasket is used to achieve
a floating retaining construction to improve sound insulation.
EG
Cylinder Head Cover No.2
Cylinder Head
Cover No.1
Blowby Gas Flow
Gasket
147EG46
147EG47
Cinched
Rubber
Aluminum
Sheet
Adhesive
Film
Spaced Bolt
151EG33
Vibration Isolating Washer
147EG48
Gasket Cross Section
112
ENGINE
– 1HD-FTE ENGINE
2. Cylinder Head
D
Similar to the previous 1HD-FT engine, the adoption of the 4-valve mechanism has made it possible to
position the injection nozzle perpendicularly over the center of the cylinder bore. Together with the adop-
tion of 2 intake ports of different shapes, this enables the generation of an optimal swirl and the introduc-
tion of an ample volume of intake air. As a result, the mixing of fuel and air has been accelerated to achieve
an appropriate combustion.
D
The cooling performance has been improved by enlarging the water jacket around the exhaust valves and
the injection nozzles, thus improving the reliability of the engine.
D
The exhaust valve seats have been changed to a type made of sintered alloy that excels in wear resistance.
Injection Nozzle
Intake
Exhaust
Port
Valve Seat
Front
Exhaust
147EG102
147EG49
3. Cylinder Head Gasket
D
A 3-layer steel laminate type cylinder head gasket has been adopted.
D
The gasket has adopted a bead construction at its cylinder bores, water holes, and oil holes. The periphery
of the gasket has been folded to accept bearing stress. This prevents unnecessary bearing stress from being
applied to the sealing portions such as at the bores, thus restraining the deformation of the bores over the
cylinder block.
Bead Around Bore
A
A’
B
Bead Around Water Hole
B’
A – A’ Cross Section
Folded
B – B’ Cross Section
147EG50

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