Rotax SI-912 i-004R3, Инструкция по эксплуатации

Страница: 9 / 15

d
068
92.
fm
SI-916 i-003R1 / SI-915 i-003R2
SI-912 i-004R3 / SI-912-018R4 /
SI-914-020R4
SERVICE INSTRUCTION
02 July 2021 79-00-00
Revision Page 9 of 15
Copyright - BRP-Rotax GmbH & Co KG. All rights reserved.
3.6) Inspect the hydraulic valve tappet for correct purging
See Fig. 5 and Fig. 6 .
The following check procedure describes the correct method for checking the hydraulic valve tap-
pets.
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.
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.
m
WARNUNG
m
WARNING
Risk of burns and scalds.
Hot engine parts. Always allow engine to cool down to ambient tempera-
ture 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 center
(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. Repeat on other rocker arms.
4 Check distance between rocker arm and valve contact surface. Max. allowable distance
0.5 mm (0.02 in.).
m
WARNUNG
NOTICE
If it is possible to push the valve tappets further than this limit, perform an
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.
Step Procedure
5 Repeat on all other cylinders.
Step Procedure
1 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
Fig. 6 . An exceeding of
max. 0.04 mm (0.0016 in.) is not acceptable.
NOTE: 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.