Rotax 914 series - Inspection for Correct Venting (Priming) of Hydraulic Valve Tappets

page 78
July 01/2008
Effectivity: 914 Series
Edition 2 / Rev. 0
d04278
INSTALLATION MANUAL
BRP-Rotax
13.11)Inspection for correct venting (priming) of hydraulic valve tappets
(See Fig. 45)
The subsequent check procedure describes the correct method to verify adequate
priming of hydraulic valve tappets.
■ CAUTION: Engine has reached operating temperatures here. Use appropriate
safety equippment and clothing.
- Remove valve cover on cylinder 1.
- Turn crankshaft direction in of normal rotation so that the piston on cylinder 1 is on
ignition top dead center (both valves are closed).
- Press on push rod side of rocker arm with a force (F) of about 70 N (15.0 lbf.) for
about 3 sec. Approximate force can be verified with a fan belt tester. Repeat on other
rocker arms.
- Check distance between rocker arm and valve contact surface. Max. allowable
distance 0,5 mm (0,02 in.).
- Repeat on all other cylinders.
■ CAUTION: If it is possible to push the valve tappets further than this limit, an
additional engine run for about 5 min. at 3500 rpm after refitting the
valve covers is necessary. To get the hydraulic valve tappets primed,
this process can be repeated another 2 times.