Checking/Correcting Basic Setting of Compensation Elements

NOTE: The test gauge serves to find the basic position or a plus (+) or minus (-) deviation of hydraulic element.
In the event of a plus (+) or minus (-) deviation, the installation of a thinner or a thicker thrust piece (4) permits to reattain the basic position.

Since December 1982 the hydraulic valve clearance compensation elements have been set with a modified preload size (previously 0.7 - 1.9 mm; now 1.2 - 2.4 mm).
This is achieved by adding a thicker thrust piece to the valve spring retainer.

Production Breakpoint: December 1982:

The revised preload dimension is also valid for all previously manufactured engines 116 and 117, and must be taken into account when checking and adjusting the basic position.

NOTE: Checking and adjusting should be carried out with the testing gauge 117 589 06 23 00 with revised measuring groove position.


Checking
1 With newly installed compensating element, crank engine with starter motor for approx. 30 seconds prior to checking.





2 Cranking engine:

Model 107
On 4-point cable connector, disconnect cable terminal 16 (cable color red / purple) so that the ignition coil and the fuel pump are not activated. Connect terminal 30 (cable color red) and terminal 50 (cable color purple).





Model 126
Disconnect cable plug (terminal 16, arrow) so that the ignition coil and the fuel pump cannot be activated. Connect terminal 30 and 50.





3 Remove load from hydraulic element to be checked, i.e. the cam tip should point in upward direction (arrow).
4 Place test gauge over hydraulic element to be tested and set measuring pin on the ball head bolt.





5 Check position of measuring groove (1) relative to the measuring edge (2):

a) The basic position is correct if the measuring edge (2) is within the 1.2 mm wide red measuring groove (1).







b) Plus deviation (+) is indicated if the measuring edge (2) is above the red measuring groove (1).

Remedy: If plus deviation (+) install thinner thrust piece to produce minus deviation.







c) Minus deviation (-) is indicated if the measuring edge (2) is below the red measuring groove (1).

Remedy: If minus deviation (-), install thicker thrust piece to produce plus deviation.

Corrections







6 Remove rocker arm by means of spring compressor. Remove thrust piece.












7 Measure thickness ,,S" Of thrust piece.
8 In the event of plus deviation (+) install thinner, in the event of minus deviation (-) install thicker thrust piece.


NOTE: For readjustment aim for center position on measuring groove.


9 Install rocker arm and repeat checkup.