Notes for rectifying the contact surface of the prechamber

AR01.30-S-5381A

Notes for rectifying the contact surface of the prechamber

29.3.95

 

Removing, installing



Notes for rectifying contact surface of prechamber

AH01.30-N-0100-01A

 Pay attention to the outlet dimension figure "B" of the prechamber

*BE01.30-N-1003-03A

 With the cylinder head installed the contact surface of the prechamber can only be rectified once. Pay attention to the spacer collars inserted and to the marks (punch marks) on the cylinder head. If necessary 

Remove the cylinder head

Engine 601.943

AR01.30-D-5800B

Engine 601.942/970

AR01.30-S-5800B

 Pay attention to the outlet dimension figure "B" of the prechamber

*BE01.30-N-1003-03A

1

Remove the prechamber

in the relative cylinder

AR01.30-S-5402A

2

Cover the housing bore of the prechamber towards the combustion chamber

 eg. with a cloth
 Shavings must not enter the combustion chamber

3

Totally unscrew the countersink in the prechamber housing bore



*601589006600

4

With the depth measurer determine the distance dimension figure "A"

 Note down the distance dimension figure "A"

*WE58.40-Z-1002-19A

5

Rectify the prechamber contact surface, with the aid of a diestock, applying slight pressure, rotate the countersink (4) approx. 5 turns (arrow)

 Do not lift the countersink (4) during the rectifying process

6

With the depth measurer determine once again the distance dimension figure "A"

 The difference in the distance dimension figures "A" found correspond to the material reduction which must be compensated with a separator collar.
The separator collar must be thicker than the material taken off the contact surface with a minimum of 0.1 mm and a maximum of 0.3 mm. There are 0.3 mm, 0.6 mm and 1.0 mm thick separator collars.

*WE58.40-Z-1002-19A

7

Unscrew the countersink (4) and clean the prechamber housing bore

8

Rotate the engine with the start and ignition siwtch

 In order to eliminate any shavings which might have entered the combustion chamber

9

Insert a separator collar with a thickness as established

10

With the aid of a punch mark the rectified prechamber in the area of the housing bore

11

Installation in reverse order

Code

Name

Engine 601.942

Engine 601.943

Engine 601.970

BE01.30-N-1003-03A

Prechamber outlet dimension figure

Outer 

mm

7.6–8.1

7.6–8.1

7.6–8.1

WE58.40-Z-1002-19A

Depth gage