Decompression Lever; Automatic Decompression - BMW D7 Workshop Manual

Decompression lever adjustment
If the engine is not decompressed in Position "1" of
the decompression lever, adjust the decompression
screw as follows:
- Crank the engine to the same position as in the
valve adjustment
- Turn the decompression lever to Position "1"
After loosening the hex nut, turn the adjusting
-
screw to the right until the rocker arm touches
the valve shaft
- From this position, turn the adjusting nut
another quarter (¼) revolution to the right and
secure by tightening the nut.
The engine is equipped with automatic
decompression.
Function:
- If the handle is set to Position "2", cranking the
motor automatically turns the handle further to
Position "0" (compression)
- A specially designed tappet turns the
decompression shaft further with every raising
of its valve.
Extract the clamping sleeve of the gear segment on
the valve shaft with pointed pliers and dismantle the
decompression shaft with gear segment.
Installing the automatic decompression system
NOTE
The hole for the clamping sleeve in the
gear segment, viewed from the flattened
side of the shaft, lies towards the outside
of the engine.
In this arrangement, the automatic decompression is
operated by the left tappet (when looking towards
the timing gear side). The decompression handle
turns clockwise.
The length of the tappet (with collar) is adjustable.
The standard length is
147.8 – 148 mm
Adjust Automatic decompression
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