Section 04
ENGINE
Sub-Section 04
(ROTARY VALVE)
04-04-8
787 Engine
To install rotary valve shaft in crankcase, use a
pusher (P
/
N 290 876 609) and handle (P
/
N 290
877 650).
1. Pusher
2. Handle
Push shaft until it stops on bearing seat.
All Engines
At snap ring installation, position it so that its
sharp edge faces outwards.
13, Rotary Valve
The rotary valve controls the opening and closing
of the inlet ports. Therefore its efficiency will de-
pend on the precision of its installation.
IDENTIFICATION OF THE ROTARY VALVE
There is no identification code on the valves. To
find out the duration, place an angle finder on the
valve and measure the valve cut-out angle or use
the following templates.
F01B2FA
2
1
F01D8OA
Engine
Rotary Valve
P/N
Valve
Duration
587
290 924 508
147°
717 and 787
290 924 502
159°
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