7) Washers - Rotax MMH-912 Series Maintenance Manual

3.11.7) Washers

Fig. 72-73
„magnified image"
Fig. 72-74
„magnified image"
Effectivity 912/914 Series
Edition 1 / Rev. 3
BRP-Powertrain
Maintenance Manual
See Figs. 72-73, 72-74 and 72-75.
Carry out a visual inspection of the washers for damage and wear.
The wear must be measured radially with a dial gauge, starting from the
reference area (on the inner part of the valve spring support) in
measuring range radius (1) and working towards the outside. Dimen-
sion t=max. 0.04 mm (0.0016 in.). see Fig. 72-75. Pounding (wear) of
more than 0.04 mm (0.0016 in.) is not permissible. If the dimension
exceeds this limit, the valve, the valve spring support, the valve spring
retainer, the valve cotters and the hydraulic valve tappet or any other
damaged components must be replaced on the affected valve.
◆ NOTE: The valve spring support can indicate a malfunction of
the valve train as a result of badly or insufficiently
vented hydraulic valve tappets. Under normal condi-
tions, no measurable wear will be seen, even after
longer periods of operation. If a visual inspection
reveals pounding wear on the contact surface, the
current wear must be tested using a dial gauge.
See SI-912-018 / SI-914-020, "Purging of lubrication system", latest
issue.
05450
05451
Fig. 72-75
1
05449
72-00-00
page 69
October 01/2010