Rotax MMH-912 Series Maintenance Manual page 137

Fig. 72-68
5
07482
4
Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
Oil carbon residue on up to max 20% of the moving path is permissible.
See Fig. 72-67.
■ CAUTION: If there are heavier deposits, the valve may already
have overheated and must be replaced. There is a
danger of valve fracture at the weld.
Carry out a visual inspection of the 3 retaining grooves (3) on the valve
stem for damage or wear. To check the wear, fit a new valve cotter. It
must fit without perceptible clearance.
Place the valve on roller blocks (4), roll it and measure the max.
permissible out of true value VT02 on the valve disk using a dial gauge.
See Fig. 72-68.
◆ NOTE: The out of true value can also be measured with the
dial gauge adapter assembly part no. 976140 (7). See
Fig. 72-69.
See 72-00-00 sec. 4.
VT02
4
~45 mm
(1.77 in.)
~25 mm
(0.98 in.)
7
Fig. 72-69
07574
72-00-00
page 65
May 01/2007