Checking The Hydraulic Valve Tappet For Correct - Rotax 912 Series Installation Manual

3.4) Checking the hydraulic valve tappet for correct purging
See
General note
The following check procedure describes the correct method for purging
the hydraulic valve tappet.
The following work procedures must be carried out:
Instruction
1
2
3
4
5
Effectivity: 912 Series
Edition 2/Rev. 0
BRP-Powertrain
INSTALLATION MANUAL
Fig. 13.
Risk of burns and scalds.
WARNING WARNUNG
Hot engine parts.
Always allow engine to cool down to ambient temper-
ature before starting work.
Step
Remove valve cover on cylinder 1.
Turn crankshaft in direction of normal rotation so that cylinder 1 is set to
top dead centre ignition (both valves are closed).
Push down the rocker arm on the push-rod side with a force (F) of around
70 N (15.74 lb-force) for about 3 seconds. You can using a belt tester, for
example, to check approximately how much force is being exerted. Re-
peat on other rocker arms.
Check the size of the gap between the rocker arm and the valve contact
surfaces. Max. permitted gap 0.5 mm (0.02 in.).
NOTICE
Repeat on all other cylinders.
Procedure
If it is possible to push the hydraulic valve tappet
further than this limit, an additional engine run for
about 5 min. at 3500 rpm, after refitting the valve co-
vers, is required. In order to vent the hydraulic valve
tappet, this process can be repeated another 2 times.
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page 26
August 01/2012