Repairing the injectors

AR07.03-S-6752A

Repairing the injectors

9.2.95



Testing

1

Test the injector

Engine 601.942/970

AR07.03-S-6712A

Engine 601.943

AR07.03-D-6712B

Repairing

2

Secure the injector-holder (1) in a lathe and unscrew the lock screw of the injector (8)


 Use protection clamps

*001589650900

3

Take the injector out of the lathe and dismantle it

 Pay attention not to confuse the different injector components

4

Clean the needle (6) and the body (7) with the aid of a brass brush (9)

5

Clean the seat of the injector needle with a cleaning mill (arrow)



*000589006800

6

Perform the visual and slide test, to do this submerge the needle (6) and the injector body (7) in Diesel fuel

 Holding the injector body (7) vertical the needle (6) must slide in the direction of its seat due to its own weight, if necessary

replace the needle (6) and the injector body (7)


7

Rectify the intermediate washer (5) on both sides, using a suitable support

The needles (6) and the bodies (7) of different injectors must not be confused and they must only be replaced by pairs.

8

Assemble the injector



*BA07.11-N-1012-01A



*001589650900

9

Test the injector again

Engine 601.942/970

AR07.03-S-6712A

Engine 601.943

 If the ejection pressure found is too low or if there is an impermissibly large difference in the injection pressure of the individual injectors 

Set ejection pressure of the injectors by disassembling injector and replacing washer (2)
 Each 0.05 mm washer thickness produces a pressure difference of about
3 bar.
Thicker washer: ejection pressure greater
Thinner washer: ejection pressure less

AR07.03-D-6712B

Number

Name

Engine 601.942 601.970

Engine 601.943

BA07.11-N-1012-01A

Injector-holder in the injector lock nut

Nm

7090

70–90