BRP-Powertrain
Maintenance Manual
Effectivity 912/914 Series
Edition 1 / Rev. 3
72-00-00
page 63
October 01/2010
d04776
3.11.4) Valve seats
See Fig. 72-66.
Carry out a visual inspection of the valve faces for damage and wear.
Apply engineers blue evenly to the valve faces and fit the valves into the
respective valve guides. Turn the valve under gentle pressure to
produce a clear imprint of the sealing surface on the valve seat ring.
Ensure that the sealing surface of the valve seats (1) is clean and if
necessary, regrind with valve lapping paste.
■
CAUTION: The annular imprint on the valve face must be a
continuous, unbroken ring.
The width of the imprint corresponds to the width of the
valve seat CH02.
■
CAUTION: If burned spots or deformation are detected, send the
cylinder head to a ROTAX
authorized overhaul facility
for overhaul or repair.
See 72-00-00 sec. 4.
Maß
dim.
45°
00285
CH02
1
Fig. 72-66
Summary of Contents for MMH-912 Series
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