Yanmar EF-494T User Manual

3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
85
3.1.6 Fuel injection nozzles
The use of Yanmar's original direct-injection combustion chamber plus hole valve
ensures the ideal mixing of fuel with air, thereby enabling complete combustion.
Combustion chamber
Direct-injection type
Nozzle
Hole valve (5 injection holes)
Initial injection pressure
21.6MPa (220kg/cm2)
<Precautions for assembling the injection valve>
(1) The nuts and case nuts used to assemble the fuel injection valve should be
tightened to the specified torque.
Tightening
torque
Mounting bolt for fuel injection
valve retainer(M8 x 1.25)
24.4 to 28.4N•m (2.3 to 2.9kgf•m)
Case nut
39 to 44N•m (4 to 4.5kgf•m)
Note: Do not lubricate the bolt threads and the nut face.
(2) When removing the injection valve, make sure that protector (A) and packing
(B) do not remain in the cylinder head. Replace them whenever reinstalling
the injection valve.
(3) An increase of 0.1 mm in thickness of the pressure adjusting shim section will
result in an increase of about 19 MPa in injection pressure.
IMPORTANT
 When the install the fuel injection nozzle, apply the molybdenum grease to the
outside of the (D).
 The flat surface of the washer (C) must be faced upward.
(A) Protector
(B) Packing
(C) Washer
(D) Nozzle holder
(E) Pressure adjusting
shim section
(F) Nozzle spring
(G) Nozzle spring seat
(H) Valve stop spacer
(I) Nozzle valve
(J) Nozzle body
(K) Nozzle
(L) Nozzle mounting nut
Tightening torque: 39 –
44 N•m (4 – 4.5 kgf•m)

Yanmar EF-494T Specifications

General

Brand	Yanmar
Model	EF-494T
Category	Tractor
Language	English