Alamarin Jet Jet-160 Istruzioni operative
Repair Manual 1 2
Version 1.00
Version 1.00
alamarin-jet
water jet propulsion unit
REPAIR MANUAL
Alamarin-Jet Oy has published this manual in order to guide the owners and users as
well as companies carrying out repairs to
alamarin-jet
water jet propulsion unit .
Alamarin-Jet Oy has published other manuals separately for technical designers, users
and mechanics.
From here on in this manual the
alamarin-jet
water jet propulsion unit will be refer-
red to as ”jet”. This term refers exclusively to a propulsion unit manufactured byAla-
marin-Jet Oy.
The instruction covers the following jet propulsion models:
Jet-160 Jet-180 Jet-185
If the given information is type specic, this will be expressed in the text.
Clarifying gures will be used in this manual.
NOTE - the text includes a warning of a slight danger or a possibility of minor damage to equip-
ment
HINT - the text includes useful additional information or a hint which facilitates the work perfor-
mance or procedure
STOP!
SERIOUS DANGER - the text includes a warning of danger to life
WARNING - the text includes a warning of a danger that can lead to personal injury, breaking
down of equipment or serious malfunction of equipment
WARRANTY
GUARANTEE MATTER - the text includes a guarantee clause
Symbols used in the Repair Manual:
ARROW DESCRIBING MOTION
INDICATOR ARROW
XPART MARKING
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Index 3
List of Appendixes ...............................................................................................4
1. Drive Shafts and Coupling Flanges.................................................................5
1.1. Joint Types...............................................................................................5
...1.1.1. Constant Velocity Shaft.....................................................................5
...1.1.2. Rubber Joint......................................................................................6
...1.1.3. Cardan Shaft.....................................................................................6
1.2. Tightening the Fastening Screws.............................................................6
1.3. Balance....................................................................................................6
1.4. Coupling Flanges.....................................................................................7
2. Bearing and Main Shaft...................................................................................8
2.1. Front Bearing ...........................................................................................8
...2.1.1. Disassembly......................................................................................8
... 2.1.1.1. Jet-160.......................................................................................8
... 2.1.1.2. Jet-180/185..............................................................................11
...2.1.2. Assembly and Installation ...............................................................13
... 2.1.2.1. Jet-160.....................................................................................13
... 2.1.2.2. Jet-180/185..............................................................................14
2.2. Rear End Bearing Disassembly and Assembly......................................15
3. Impeller..........................................................................................................17
3.1. Detachment............................................................................................17
3.2. Repair.....................................................................................................17
3.3. Installation..............................................................................................18
3.4. Type........................................................................................................20
4. Reversing Deector and Control Shafts ........................................................22
4.1 Reversing Deector.................................................................................22
...4.1.1. Detachment.....................................................................................22
...4.1.2. Repair .............................................................................................23
...4.1.3. Installation.......................................................................................23
5.Steering Nozzle and Shafts............................................................................24
5.1. Steering Nozzle......................................................................................24
...5.1.1. Detachment.....................................................................................24
...5.1.2. Repair .............................................................................................24
...5.1.3. Installation.......................................................................................25
5.2. Control Shafts ........................................................................................25
6. Stator.............................................................................................................25
6.1. Detachment............................................................................................25
...6.1.1. Detachment One Part at a Time .....................................................26
...6.1.2. Detachment as Whole.....................................................................26
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6.2. Repair......................................................................................................... 27
6.3. Installation.................................................................................................. 27
7. Electronic Reversing Deector Control.............................................................. 27
7.1. Installation Instructions............................................................................... 28
7.2. Adjustment Instructions.............................................................................. 29
APPENDIXES
Appendix 1. Recommended Greases and Tightening Torgues............................. 30
Appendix 2. Impeller Dimensions.......................................................................... 31
Appendix 3. Ordering a Spare Part Impeller.......................................................... 32
Appendix 4. SE-01................................................................................................. 33
Appendix 5. SE-02................................................................................................. 34
Appendix 6. Exploded Views................................................................................. 35
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1. Drive Shafts and Coupling Flanges
Between the jet and the engine there is always an intermediate shaft which transmits the
power from the engine to the jet propulsion unit’s main shaft. There are various types of
shafts. Normally, the shaft has been chosen and installed by the boat’s manufacturer.
1.1. Joint Types
A constant velocity shaft is a cardan shaft between the engine and the jet, which allows
angle deviations. The joints are based on balls rolling on a spherical surface. This shaft
type enables vibration-free running even if the joint angles at different ends of the shaft
deviate from each other.
1.1.1. Constant Velocity Shaft
Detachment, Repair and Installation
At the engine side the constant velocity shaft is attached to the ywheel, to a coupling
ange installed by the engine manufacturer or to the gearbox. There can be an adapter
ange between the joint and the engine, with which the engine and shaft hole spacings
are tted with each other.
There can also be an adapter ange between the jet’s coupling ange and the joint.
Open the joint fastening screws
at the jet side and leave the pos-
sible adapter attached to the
coupling ange. The bolts can
be hex or socket screws (gure
1.1.1-1).
Open the joint fastening screws at the engine side and leave the possible adapter at-
tached to the ywheel.
The rubber covers and the whole end of the joint are removable parts of the constant
velocity shaft.
If the rubber cover of the joint is broken, lubricating grease comes out and the danger is
that the whole joint may break down. A broken rubber must be replaced immediately.
Follow the manufacturer’s instructions in repair and installation.
Figure 1.1.1-1
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The rubber joint is an elastic rubber element on the intermediate shaft between the en-
gine and the jet. The rubber element dampens the vibrations and sudden torsional loads
that are transmitted from the engine to the boat’s hull, and allows some angle deviation.
An intermediate shaft equipped with rubber joints is installed similarly to a constant
velocity shaft. Because the shaft, engine and jet propulsion unit anges are not always
compatible, it is usually necessary to use adapter anges.
There are various types of intermediate shafts equipped with a rubber joint. The
manufacturer’s instructions must be followed in repair and installation.
1.1.2. Rubber Joint
1.1.3. Cardan Shaft
The cardan shaft has been pivoted with spider bearings. The joint angles at different
ends must be of equal size to attain vibrationless and durable running.
The cardan shaft has been installed similarly to the constant velocity shaft. Adapter an-
ges are used sometimes because the shaft, engine and jet propulsion unit anges are not
always compatible.
1.2. Tightening the Fastening Screws
The following information will serve as general instructions:
Always tighten the fastening screws of the coupling anges ngertight rst and after
that in a crosswise sequence gradually until they are at the correct torque. This ensures
that the joint is attached evenly to the coupling ange.
However, check with the manufacturer that possible instructions given separately by the
manufacturer are followed in tightening.
Use thread locking compound to tighten the bolts. Observe the manufacturer’s instruc-
tions on using a thread locking compound.
1.3. Balance
The balance and correct installation of the intermediate shaft on the joints at different
ends is imperative to a functioning whole. Unbalance of the intermediate shaft, anges
that have been tightened or attached incorrectly cause the equipment to break down very
quickly.
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Figure 1.4-3
IF AN INTERMEDIATE SHAFT THAT HAS BEEN INSTALLED
OR BALANCED INCORRECTLY CAUSES DAMAGE, THE GUA-
RANTEE IS NOT VALID!
WARRANTY
1.4. Coupling Flanges
Different kind of coupling anges are installed to the jet’s main shaft depending on the
type of the intermediate shaft and engine power. Commonest of these are SAE 1310,
VNA 10.
If necessary, there is an adapter between the coupling ange and the transmission shaft,
which enables fastening.
Removing:
The coupling ange is tightened on the conical shaft end with an M16 nut. Unscrew the
nut (gure 1.4.-1) and pull the ange off the cone with a puller (gure 1.4-2). There is
a spacer under the fastening nut, which presses the shaft on the coupling ange. Never
install the coupling ange without the spacer. Remove the wedge from the groove (-
gure 1.4-3).
Figure 1.4-1
Figure 1.4-2
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The shaft can be stopped from rotating with a bolt that is pushed
through the fastening screw hole against the surface of the bearing
housing. See gure 1.4-1.
Different models have different types of bearing housing structure. This does not affect
the fastening of the coupling ange.
2. Bearing and Main Shaft
2.1.1. Disassembly
2.1. Front Bearing
2.1.1.1 Jet-160
The bearing housing is xed in the casting. Only the support bearing housing is remova-
ble.
Before the shaft can be disassembled, the reversing deector, the steering nozzle, the
stator (see sections 4-6), and the impeller (see section 3) must be removed from the rear
of the jet. The boat must be out of the water.
Remove the coupling ange as described in section 1.4.
Open the fastening screws of the support bearing housing (6 pcs) as in gure 2.1.1.1-1
and remove the support bearing housing (gure 2.1.1.1-2).
Figure 2.1.1.1-1
Figure 2.1.1.1-2
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The shaft protrudes into the en-
gine room with the bearings. The
t may be tight, but when pushed
from the outside, enough force is
produced to remove the shaft (gu-
re 2.1.1.1-3).
There are still two shaft seals in
the bearing housing. They can be
removed with for example a sc-
rewdriver.
Figure 2.1.1.1-3
The bearing (gure 2.1.1.1-4) consists of a thrust bearing that receives the pure axial
force (A) and an angular ball bearing that carries radial loads (C). The plate (B) between
the bearings transmits thrust from the thrust bearing to the outer race of the angular ball
bearing.
The safety ring (D) prevents the bearings from sliding off the shaft. The actual forces
are received with the shoulder in the support bearing housing, which presses on the ou-
ter race of the bearing.
A
B
C
D
Figure 2.1.1.1-4
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To remove the bearings, rst
remove the safety ring (A) and
then push the bearings off the
shaft (B) (gure 2.1.1.1-5).
A
B
Figure 2.1.1.1-5
Figure 2.1.1.1-6
There is a needle bearing in the
support bearing housing, which
carries radial forces. There is a
shaft seal behind the bearing,
and a safety ring in front of it,
which stops the bearing from
sliding out from the bearing hou-
sing.
To remove the bearing, rst re-
move the safety ring (gure
2.1.1.1-6) and then push the seal
and the bearing from the seal
side at the same time.
Questo manuale è adatto per i seguenti modelli
2
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