Hydraulic Valve Tappets - Rotax 912 Series Maintenance Manual

3.14) Hydraulic valve tappets

See Figs. 72-94, 72-95, 72-96 and 72-97.
Pull hydraulic valve tappets (1) out of the housing using the mono hook circlip
puller (2), part no. 976380.
■ CAUTION : Never insert the puller into the retainer (3), but always into the
Lay hydraulic valve tappets aside, arranging them in a manner that ensures they
will be refitted in their original place.
Carry out a visual inspection of the hydraulic valve tappets for damage and wear.
◆ NOTE:
Failure of a hydraulic valve tappet to rotate will result in uneven wear (2) on the
contact surface (1). If there is fretting/pitting, the tappet must be replaced. See
Fig. 72-97.
■ CAUTION : The face of the hydraulic valve tappets must not be reworked!
■ CAUTION : Taking apart hydraulic valve tappets is not planned and not
■ CAUTION : In the event of malfunctions such as operation with un-purged
■ CAUTION : If it is necessary to replace a hydraulic valve tappet, make sure
Depending on storage conditions, new hydraulic valve tappets are partially
emptied and pump full of oil during engine startup. Oil enters the hydraulic valve
tappet through the bore (5). The retaining ring (3) keeps the piston (6) in position
when the hydraulic valve tappet is removed. See Fig. 72-95 and 72-96.
◆ NOTE:
See 72-00-00 sec. 4.
Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
groove in the hydraulic valve tappet. Inserting it into the retainer
could cause the hydraulic valve tappet to fall apart. See Fig 72-
94.
The hydraulic valve tappets rotate during engine operation, so
the camshaft lobes (4) should be worn evenly.
necessary.
hydraulic valve tappets, the components in the tappet (plate)
are worn down.
that a tappet with a polished cam running surface (ROTAX part
no. 881831) is used.
When putting into operation, observe SI-912-018 /SI-914-20
"Venting the lubrication system", latest issue.
72-00-00
page 83
May 01/2007