d04927.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
79-00-00
page 26
August 01/2012
3.4) Checking the hydraulic valve tappet for correct purging
General note See Fig. 13.
The following check procedure describes the correct method for purging
the hydraulic valve tappet.
Instruction The following work procedures must be carried out:
Risk of burns and scalds.
Hot engine parts.
Always allow engine to cool down to ambient temper-
ature before starting work.
Step Procedure
1 Remove valve cover on cylinder 1.
2 Turn crankshaft in direction of normal rotation so that cylinder 1 is set to
top dead centre ignition (both valves are closed).
3 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.
4 Check the size of the gap between the rocker arm and the valve contact
surfaces. Max. permitted gap 0.5 mm (0.02 in.).
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.
5 Repeat on all other cylinders.
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