Specifications

8
Presentation
TD420VE, TAD420VE, TD520GE, TAD530/531GE and TAD520VE are in-line, direct injected, 4-cylinder industrial
diesel engines.
TAD620VE, TD720GE, TAD730/731GE, TAD720VE, TAD732GE, TAD721VE, TAD733GE and TAD722VE are in-
line, direct injected, 6-cylinder industrial diesel engines.
All engines are equipped with electronically controlled fuel management (EDC4), turbocharger, thermostatically
controlled cooling systems and electronic speed control. All TAD engines are also equipped with an intercooler.
Technical description
Engine and engine block
– The engine block and cylinder head are manufac-
tured of alloyed cast iron
– Five bearing, induction hardened crankshaft
(TD420VE, TAD420VE, TD520GE, TAD530/
531GE, TAD520VE, TAD532GE)
Seven bearing, induction hardened crankshaft
(TAD620VE, TD720GE, TAD730/731GE,
TAD720VE, TAD732GE, TAD721VE, TAD733GE,
TAD722VE)
– Replaceable wet cylinder liners (TD520GE,
TAD530/531GE, TAD520VE, TD720GE, TAD730/
731GE, TAD720VE, TAD732GE, TAD721VE,
TAD733GE, TAD722VE, TAD532GE)
Replaceable dry cylinder liners (TAD620VE)
Liner-less (TD420VE, TAD420VE)
– Cast aluminum pistons with oil cooling
– Three piston rings, with a “keystone” type top ring
– Induction hardened overhead camshaft with valve
lifters and push rods.
– Two valves per cylinder
– Replaceable valve seats and valve guides (does
not apply to TD420VE, TAD420VE, TAD620VE)
Control unit
– Microprocessor based fuel supply control unit
(EDC 4)
– Maximum ambient temperature 80° C
– Automatic sensing of 24 V or 12 V.
– Atmospheric pressure sensor for high altitude ap-
plications (option)
Fuel system
– Belt driven feed pump - BOSCH injection pump,
one for each cylinder
– HEINZMANN actuator
– EDC 4 (Electronic Diesel Control). Please refer to
a separate description.
Lubrication system
– Water cooled oil cooler.
– Crankshaft driven lube oil pump
– Full flow filter with bypass
Turbocharging system
– Turbocharger
Cooling system
– Radiator with expansion tank
– Air cooled intercooler (TAD)
Electrical system
– 24 V (standard), 12 V (option)
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