Replacement Of Engine Mount Vibration Dampers - Magni Gyro M16C Ordinary Maintenance Manual

M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
3.15 REPLACEMENT OF ENGINE MOUNT VIBRATION DAMPERS
(See fig. 3.15/1)
Engine mount vibration dampers pn 243 are made of silicon‐rubber, with a specific mixture which allows to reduce
the vibrations of the fixing between the engine and the structure.
Aging and wear of the vibration dampers modifies the silicon mixture, resulting in a variation of the angle between
thrust axis and longitudinal axis of the gyroplane. This deformation and its effect reduce the damping capabilities
and the distance between the edges of the propeller blades and the keel tube. Vibration dampers need periodical
replacement to avoid the risk of interference between the propeller blade and the keel tube in case of heavy
landing.
3.15.1 REPLACEMENT PROCEDURE
(See fig. 3.15/1)
1. Before starting verify that the engine's ignition key and push‐button are in OFF position and that all the
breakers are switched OFF;
WARNING:
Replace the vibration dampers on the right side first and only then the dampers on the left side.
2. Unscrew the 2 bolts M10x100 on the right side of the engine mount;
3. Remove both right side bolts;
4. Using a slotted screwdriver to lever, remove the front vibration damper units (spacer pn 242, vibration
damper pn 243);
5. Apply a constant force (FC) on the propeller flange along the transversal axis, so as to be able to free the
rear vibration dampers from their housing on the engine mount (see picture);
6. Fit new vibration dampers pn 243 in the engine mount housings; spray some releasing agent (WD40) to
make this operation easier;
7. Insert the original spacer pn 242 in the vibration dampers pn 243; spray some releasing agent (WD40) to
make this operation easier;
8. Remove the lateral load applied previously to the propeller flange, so as to place the engine back to its
correct position and be able to insert the engine fixation bolts M10x100;
9. Replace the fibrelock nuts M10 and tighten them;
10. Repeat steps 2 to 9 for the vibration dampers on the left side.
ISSUE
A_November 2012
.
PAGE
79