Just a word of caution if you are not already past this stage:
The Rotax 912S installation manual states a torque range for the M8 nuts that
hold
the exhaust pipes in place against the cylinder heads.
When you torque the nuts, you will notice that the flanges (the ones held in
place
by the bolts and nuts, not the bevelled flanges welded to the pipes) begin
to bend before you reach the lower limit of the torque stated by Rotax.
Do not apply more torque! The flanges (and the rest of the exhaust system) are
NOT Rotax parts, and evidently don't take the Rotax stated torque without
bending.
I checked this with Andy today: It is difficult to explain why Rotax keep
stating
the torque when the nuts are check-nuts and therefore do not require a minimum
torque to stay put. The nuts should, according to Andy, only be torqued
to give a tight connection, to avoid exhaust leaks. There is no proven need to
torque more, the system will stay in place even though this connection to the
cylinder heads is the only place where the entire exhaust system is anchored
to the engine.
Andy will place a note about this in the next Tech Talk column in the Europa
Flyer,
and in the f.w. forward manual at next revision.
Make a note yourself, already now!
Regards,
Svein
A225 XS Trigear - now in Norway
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