Injection Equipment; Fuel Circuit; Injection Pump; Checking Injection Pump - Kohler KD 477-2 Workshop Manual

XI

INJECTION EQUIPMENT

33
34
35
- 26 -

Fuel circuit

Feeding is carried out by a diaphram pump actuated by a camshaft
eccentric coupled to a cap.
See assembly on page 36 and consult spare parts catalogue for re-
placement.
Details of fig. 33:
1.Tank - 2.Diesel filter - 3.Feeding pump - 4.Injection pump - 5.Injec-
tion pipes - 6.Injectors - 7.Diesel discharge pipe.

Injection pump

The injection pump is of the single casing type with two, constant
stroke, separate pumping elements. Details of fig. 34.
1.Pump casing - 2.Pumping element - 3.Rack bar - 4.Eccentric do-
wel - 5.Adjusting bushing - 6.Spring - 7.Lower plate - 8.Tappet - 9.Up-
per plate - 10.Locking pin - 11.13.18.Gaskets - 12.Diesel intake con-
nection - 14.Diesel exhaust screw - 15.Delivery valve - 16.O-ring -
17.Valve spring - 19.Delivery connection.

Checking injection pump

Before dismantling injection pump check pressure seal of the pum-
ping unit, cylinder and valve as follows:
1. Connect a pressure gauge graded up to 600 kg/cm² (fig. 35) to
the diesel delivery pipe.
2. Set the rack bar in a half way position.
3. Rotate flywheel showly until the pumping element has completed
a compression stroke.
If the test is carried out on the bench, take care that the
pumping element does not strike the delivery valve while
pumping.
4. Take the pressure gauge reading. If the reading is less than 300
kg/cm² , the complete pumping unit must be replaced.
During the test, the reading on the gauge will show a progressive
pressure increase to a maximum value and will then fall suddenly
and stop at a lower pressure.
Replace valve if the fall in pressure exceeds 50 kg/cm² and con-
tinues to fall slowly.

Injection pump setting

Register eccentric dowel to the maximum capacity of the pumping
elements (q, fig. 39).
KD 477-2 Workshop Manual_cod. ED0053029370_1° ed_ rev. 00