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SI-916 i-003R1 / SI-915 i-003R2
SI-912 i-004R3 / SI-912-018R4 /
SI-914-020R4
3.6) Inspect the hydraulic valve tappet for correct purging
See
Fig. 5
m
m
The following check procedure describes the correct method for checking the hydraulic valve tap-
pets.
Step
1
2
3
4
m
Step
5
3.7) Replacement of components
If a hydraulic valve tappet still malfunctions after several engine runs, it must be replaced and the
valve spring support must be inspected for wear.
All work has to be performed in accordance with the latest Maintenance Manual for the respective
engine type.
Step
1
If the valve spring support indicates wear, replace valve spring retainer, valve spring support, both
valve cotters, valve and hydraulic valve tappet. Additionally perform a detailed visual inspection of
relevant valve train components of push rod, rocker arm and valve spring for abnormal wear con-
dition.
02 July 2021
Revision
Copyright - BRP-Rotax GmbH & Co KG. All rights reserved.
and
Fig.
6.
Risk of burns and scalds.
WARNING
WARNUNG
Hot engine parts. Always allow engine to cool down to ambient tempera-
ture before starting work.
Remove valve cover on cylinder 1.
Turn crankshaft in direction of normal rotation so that cylinder 1 is set to top dead center
(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. Repeat on other rocker arms.
Check distance between rocker arm and valve contact surface. Max. allowable distance
0.5 mm (0.02 in.).
If it is possible to push the valve tappets further than this limit, perform an
NOTICE
WARNUNG
additional engine run for about 5 min. at 3500 rpm after refitting the valve
covers. To get the hydraulic valve tappets primed, this process can be re-
peated another 2 times.
Repeat on all other cylinders.
Inspect valve spring support (1). Measure the wear referring to the reference surface
(inner area of valve spring support) in radial direction (2) to outer side with a dial
gauge. Value t = max. 0.04 mm (0.0016in.). See
max. 0.04 mm (0.0016 in.) is not acceptable.
NOTE:
SERVICE INSTRUCTION
Procedure
Procedure
Procedure
The valve spring support indicates a possible malfunction of valve
train caused by incorrectly or insufficiently purged hydraulic valve
tappets. At standard conditions no wear is visible even after a long
time of operation. If the visual inspection shows some wear on the
valve spring support surface, measure the actual wear with a dial
gauge.
Fig.
6. An exceeding of
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