Engine - Engine and crankcase
Engine - General specification
TT35 / TT40 models
Make
Simpsons
Type
4 stroke, diesel, naturally aspirated, direct injection,
water cooled
Power
TT40
42 Hp
(BS Au 141a:1971)
TT35
35 Hp
(BS Au 141a : 971)
Number of cylinders
3
Bore
TT40
91.44 mm
(
3.60 in
)
TT35
88.90 mm
(
3.50 in
)
Stroke
127.00 mm
(
5.00 in
)
Cubic capacity
TT40
2500 cm³
(
153 in³
)
TT35
2400 cm³
(
146 in³
)
Compression ratio
TT40
18.5:1
TT35
17.5:1
Firing order
1-2-3
Idle speed
650 - 700 RPM
Maximum no load speed
TT40
2200 RPM
TT35
2200 RPM
Rated speed
2000 RPM
Height of cylinder block between top and bottom faces
349.010 - 349.080 mm
(
13.741 - 13.743 in
)
Parent bore diameter for cylinder sleeves
93.660 - 93.690 mm
(
3.687 - 3.689 in
)
Depth of recess of sleeves flange (cast iron sleeves)
3.760 - 3.860 mm
(
0.148 - 0.152 in
)
Diameter recess of sleeves flange (cast Iron sleeves)
97.030 - 97.160 mm
(
3.820 - 3.825 in
)
Main bearing parent bore diameter
74.080 - 74.100 mm
(
2.917 - 2.917 in
)
Camshaft bore diameter number 1
47.600 - 47.680 mm
(
1.874 - 1.877 in
)
Camshaft bore diameter number 2
47.350 - 47.420 mm
(
1.864 - 1.867 in
)
Camshaft bore diameter number 3
46.840 - 46.910 mm
(
1.844 - 1.847 in
)
Engine - General specification
TT45 model
Make
Simpsons
Type
3 Cylinder, 4 stroke, inline type, coolant cooled
Power
47 Hp
Aspiration
Naturally aspirated
Combustion
Direct injection
Bore (nominal diameter)
95.00 mm
(
3.74 in
)
Stroke
127.00 mm
(
5.00 in
)
Cubic capacity
2.70 L
(
0.71 US gal
)
Compression ratio
18.3 : 1
Rotation
Anti-clock wise from the flywheel end
Firing order
1, 2, 3
Valve tip clearance
0.30 mm
(
0.01 in
) inlet and exhaust
Atomiser setting pressure
250 - 258 bar
(
3625 - 3741 psi
)
Inlet valve closes
26.8 °
before top dead centre
Exhaust valve closes
25.3 °
after top dead centre
Total inlet open period
250.6 °
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