Rotax MMH-912 Series Maintenance Manual page 140

Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
To check the spring force, apply a test load (F) (test weight set assy. part
no. 976995) and measure the remaining spring length VT04 (measuring
fixture part no. 976210). See Fig. 72-72.
Test load for dual valve spring configuration:
– Test load (F) for inner spring
– Test load (F) for outer
Test load for single valve spring configuration:
– Single valve spring
■ CAUTION: Replace valves shorter than the minimum length.
◆ NOTE: The spring length should be as equal as possible on
the inlet and outlet sides (max 0.4 mm (0.016 in.) in
difference), otherwise replace the springs.
See 72-00-00 sec. 4.
Fig 72-72
53 N (11.91 lbf)
133 N (29.80 lbf)
200 N (45 lbf)
F
07425
72-00-00
page 68
May 01/2007