Stiga WBE170 Instruction manual

WORKSHOP MANUAL
WORKSHOP MANUAL
The manufacturer reserves the right to make all the necessary technical or commercial improvements to
its products, so there may be some differences between the series of engines and the contents of this
manual. However the basic specifications and different operating procedures will remain the same.
by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts
in this document may be made without explicit authorization.
IMPORTANT NOTICE : The information contained herein is intended for Service Operations and professionals
only, able to competently perform the operations described herein, using the appropriate equipment in
order to safeguard se-curity and performance of the machine. The manufacturer is not liable for damages
or injuries arising from operations performed by individuals or inadequate facilities.
PRODUCTION YEAR
Rel. 0. 2019 - 2021
WBE 170
WBE 170

Release 00 - 11/2018
Engine WBE 170
page 3
Workshop Manual
INTRODUCTION..................................................................................................... 5
1. RULES AND PROCEDURES FOR SERVICE CENTRES .......................................... 6
1.1. Guarantee validity...............................................................................................................................6
1.2. Service repairs after guarantee period .............................................................................................6
1.3. Faultnotication...................................................................................................................................6
1.4. Spare parts request .............................................................................................................................6
2. GENERAL AND SAFETY REGULATIONS............................................................. 7
2.1. Qualicationofoperators ...................................................................................................................7
2.2. Safety measures ..................................................................................................................................7
2.3. Precautions during servicing ..............................................................................................................7
2.4. Warning labels .....................................................................................................................................8
2.5. Necessary equipment.........................................................................................................................8
2.6. Symbols and terms used for safety purposes ...................................................................................8
3. TECHNICAL DATA AND SPECIFICATIONS........................................................ 9
3.1. Identication ........................................................................................................................................9
3.2. Technical data .....................................................................................................................................9
3.3. Adjustments..........................................................................................................................................9
3.4. Expendable materials .........................................................................................................................9
3.5. Use limits ...............................................................................................................................................9
3.6. Tightening torques .............................................................................................................................10
3.7. Table of Tightening torques...............................................................................................................11
3.8. Identicationofengineunits ............................................................................................................12
4. ENGINE TUNING AND TESTING ...................................................................... 13
4.1. Operating guidelines.........................................................................................................................13
4.2. Engine tuning program .....................................................................................................................13
4.3. Functional test ....................................................................................................................................14
5. TANK AND SUPPLY.......................................................................................... 15
5.1. Emptying and removing the tank ....................................................................................................16
5.2. Cleaning the tank..............................................................................................................................17
5.3. Checking and cleaning the breather pipe.....................................................................................17
6. STARTING SYSTEM ( manual starter) ....................................................... 18
6.1. Removing the starter assembly........................................................................................................18
6.2. Replacing the rope............................................................................................................................18
6.3. Replacing the hooks .........................................................................................................................19
7. STARTING SYSTEM ( electric starter)........................................................ 20
7.1. Removing the starter motor...................................................................................................................20
7.2. Disassembly and cleaning the starter motor pinion...........................................................................21
8. INTAKE SYSTEM ............................................................................................... 22
8.1. Maintenanceoflteringelement.....................................................................................................22
CONTENTS
<< BACK >>

Release 00 - 11/2018
page 4
Engine WBE 170
Workshop Manual
9. CARBURATION................................................................................................ 24
9.1. Removing and cleaning the carburettor.........................................................................................24
9.2. Replacing the carburettor ................................................................................................................27
9.3. Adjusting speed.................................................................................................................................27
9.4. Adjusting the carburation .................................................................................................................27
10. GOVERNOR SYSTEM OF THE CARBURETTOR ............................................... 28
10.1. Adjusting speed ...................................................................................................................................28
11. AUTO-CHOKE SYSTEM.................................................................................. 30
11.1. Replacing of the AUTO-CHOKE system ...........................................................................................30
12. IGNITION....................................................................................................... 31
12.1. Checkingtheefciencyoftheignitionsystem ..............................................................................31
12.2. Checking the starter micro switch ( version with electric starter) ...........................................32
12.2a. Replacing the micro switch ( version with electric starter)....................................................... 32
12.3. Adjusting the air gap and checking the coil..................................................................................33
12.4. Replacing the coil .............................................................................................................................34
13. TURNING OFF AND STOPPING THE ENGINE ................................................ 35
13.1. Checking the control cable .............................................................................................................35
13.2.
Checking the system for turning off the engine .........................................................................................35
13.3. Checking the brake ..........................................................................................................................36
13.4. Replacing the system for turning off and stopping the engine.....................................................37
14. EXHAUST SYSTEM .......................................................................................... 38
14.1. Removingandreplacingthemufer...............................................................................................38
15. ENGINE BLOCK - External operations ........................................................ 39
15.1. Checking the heating unit seal........................................................................................................39
15.2. Adjusting the valve clearance.........................................................................................................40
15.3. Dismantlingandreplacingtheywheel .........................................................................................41
15.4. Blow-by check...................................................................................................................................42
15.5. Replacingtheuppercompressionringoftheengineshaft(ywheelside)................................42
15.6. Replacing the lower compression ring of the engine shaft (sump side) .....................................43
16. ENGINE BLOCK - Overhauling internal parts............................................. 44
16.1. Carter opening...................................................................................................................................44
16.2. Dismantling and checking the camshaft and counterweight governor .....................................45
16.3. Dismantling and checking the piston, piston rings, connecting rod and engine shaft..............47
16.4 Overhauling the valves .....................................................................................................................53
17. TROUBLESHOOTING...................................................................................... 56
CONTENTS
<< BACK >>

Release 00 - 11/2018
Engine WBE 170
page 5
Workshop Manual
The purpose of this manual is to provide Service
Centres with the information needed to perform
maintenance on, disassemble and repair the WBE
170 engine.
Interventions on the engine must be performed in
accordance with instructions in the following pages
and with safety regulations in force in the country in
which the engine is operated, and only by authori-
sed and appropriately trained personnel.
In every manual page the following informations
are described:
Release 00 - 11/2018
page 16
Engine WBE 170
Workshop Manual
WBE17018162014 EURO(V)
484479-30/ME110003424/120
484479-30/ME110003424/120
5.1. Emptying and removing the tank
1 - Remove the ring (1) of the petrol pipe (2) from
the tank side and drain all the fuel from the tank
and the pipe into a suitable container.
2 - Remove the cover (3) by unscrewing the three
nuts (4).
3 - Uncouple and remove the conveyor (5).
4 - Loosen the two rear screws (6) and remove the
tank (7).
reverse
WARNING: Before the tank with new
fuel, check that the petrol pipe is intact.
5. TANK AND SUPPLY
7
6
5
6
1
2
3
4
4
A: Motor typ for which the page is valid.
B: Reference to the chapter and the argument
with the relative numbering.
C: Presence of previous or following chapters from
the present chapter.
D: Issue date or possible audit.
E: Audit number.
F: Page progressive numbering.
Certain symbols are used in the manual, highlighting
particularly important information, risks, warnings
and prescriptions:
Warns of operations that should be carried
out with utmost care to avoid impairing the
functionality and safety of the lawnmower.
Warns of operations that should be carried
out with utmost care to avoid injury to the
operator.
 NOTE:Referstospecicadvicebythema-
nufacturer.
Reference to another procedure or part of
the manual.
Recommends that washers and O-rings are
checked and replaced if necessary.
Refers to use of special tools.
Shows all the operations requiring different
intervention methods depending on the en-
gine version.
NOTE: During the description of procedures,
the indications “right”, “left”, “front”, “rear”,
“upper” and “lower” refer to the engine
mounted on the lawn tractor seen from the
user’s perspective.
Please read all the contents of this manual to be-
come familiar with the basics of the engine, which
is fundamental for operating in a logical manner
without making errors or wasting time.
INTRODUCTION
A
B
C C
DEF
INDEX
<< BACK >>

Release 00 - 11/2018
page 6
Engine WBE 170
Workshop Manual
1.1. Guarantee validity
The warranty is supplied under the terms, procedu-
res and limits stated in the contract.
1.2. Service repairs after guarantee period
The Service Centre must write a report for each
intervention containing the serial number of the
engine [ 3.1], and summary information about
the problems complained of, the intervention made
and possible spare parts used..
A copy of these reports must be kept and made
available to the manufacturer together with the
replaced parts, in case clients should make further
complaints.
1.3. Faultnotication
The manufacturer should be informed of all faults
that recur frequently; this allows it to carefully exa-
mine the problem and make corrections on the
production line.
Similarly, the manufacturer shall report any faults
traced on its engines, indicating the best trou-
bleshooting procedure.
1.4. Spare parts request
When asking for spare parts, you must quote
their code by referring to the exploded views
corresponding to the year of manufacture reported
on the nameplate [ 3.1].
1. RULES AND PROCEDURES FOR SERVICE CENTRES
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 7
Workshop Manual
2. GENERAL AND SAFETY REGULATIONS
IMPORTANT: Before commencing with any
intervention, carefully read the information
provided in the present manual, in particular
the following safety regulations.
2.1. Qualicationofoperators
All maintenance, disassembly and repairs must be
carried out by expert mechanics who are familiar
with all the accident prevention and safety regu-
lations after reading through the procedures in this
manual.
2.2. Safety measures
All the engines are built in conformity with the Eu-
ropean safety regulations in force.
To maintain initial safety levels in the long term, the
Service Centre should take proactive measures by
making checks whenever possible.
Every time you are asked to service the engine (or
the lawnmower on which it is installed), you should:
• check:
- that the safety devices function correctly;
- that the casings and protection covers have not
been removed;
- thatthenameplatesorspecicationlabelshave
not been removed or made illegible, (as they
form an integral part of the safety devices).
• also:
- restore to proper working order any safety devi-
ces which have been manipulated or removed;
- replace ineffective, damaged or missing guards
and covers;
- replace illegible labels;
- donotcarryoutoperationsormodicationson
the lawnmower or on the engine that could af-
fect their performance or lead to an improper or
different use from the one for which it has been
designed and approved;
- warn the customer that the failure to comply with
the above points automatically voids the war-
ranty and the responsibility of the manufacturer.
2.3. Precautions during servicing
As well as following the usual accident prevention
regulations that apply to most repair shops, we
recommend you:
- disconnect the spark plug cap before servicing;
- protect hands with suitable working gloves,
especially when working near the cutting unit;
- check that you do not cause accidental petrol
leaks or other losses;
- do not smoke when working on the tank or when
handling petrol;
- do not inhale oil or petrol fumes;
- clean up all traces of spilt petrol immediately;
- do not pollute the environment with oil, petrol or
other waste and dispose of all waste in accor-
dance with the laws in force.
Exhaust gas contains carbon monoxide,
which is highly toxic, odourless and co-
lourless. Avoid inhaling.
- Perform tests on the engine in a well-ventilated
environment or in the presence of adequate
exhaust gas extraction systems.
<< BACK >>
INDEX

Release 00 - 11/2018
page 8
Engine WBE 170
Workshop Manual
2. GENERAL AND SAFETY REGULATIONS
2.4. Warning labels
A few labels bearing operator safety instructions or
requirements are afxed in full view on the engine
tank.
Le etichette sono le seguenti:
•• ••• ••••
WBE170
1 - Fire hazard due to:
- Petrol or oil
Prevent by following the precautions below:
- Do not smoke or ignite a ame in the vicinity of
the petrol or oil;
- Turn engine off before adding petrol;
- Do not spill petrol on overheated or electric parts
of the engine;
- Handle or store petrol or oil in well-ventilated
areas;
- Use non-ammable oil for cleaning engine parts.
-Accumulationofammablematerial
Prevent by following the precautions below:
- Remove dry leaves, chips, pieces of paper, dust or
other ammable material which has accumulated
in or is attached to the engine.
- Electrical cabling
Short circuits can cause res. Prevent by following
the precautions below:
- Always keep the electrical connections of the
machine clean and tightly sealed;
- Tighten any loose connectors or cabling clamps.
Replace those that are damaged.
2 - Observe the instructions and warnings contained
in the present manual and on the safety plates on
the engine.
Inappropriate functioning and maintenance can
result in serious injury or even death.
3 - Ventilation of closed areas:
In the event that it is necessary to start the engine
in a closed environment or if petrol or cleaning oil
is being used, open doors and windows to ensu-
readequate ventilation and, therefore, avoid gas
poisoning.
4 - Motor label (see [ 3.1])
2.5. Necessary equipment
All the operations can be carried out with the tools
normally used in a good garage.
The , symbol used for certain interventions
indicates that special tools or equipment are re-
commended.
2.6. Symbols and terms used for safety purposes
Some paragraphs in this manual are preceded by
symbols which indicate the following:
Operations that should be carried out with ut-
most care to avoid impairing the functionality
and safety of the engine and/or lawnmower
on which it is installed.
Operations that should be carried out with
utmost care to avoid injury to operators.
“WARNING” stresses the risk of injury to oneself
and others if instructions and regulations are not
observed.
1 2 3
4
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 9
Workshop Manual
Daily progressive
number
3.1. Identication
Every engine is marked with a serial number pun-
ched on the base and afxed to the tank; this serial
number characters and can identify:
•• ••• ••••
WBE170
The serial number must be reported on every ope-
rating sheet in the warranty application and is fun-
damental for identifying and ordering spare parts.
3. TECHNICAL DATA AND SPECIFICATIONS
3.4. Expendable materials
WBE 170
Petrol Unleaded (green)
minimum 90N.O.
Engine oil
- from 5 to 35 °C
- from -15 to +
35°C
SAE 30
10W30
Spark plug
RC12 YC
Starter rope ø 3,2x2200 mm
3.5. Use limits
The following table gives the use limits of certain
components subject to wear, after which the com-
ponent must be replaced.
WBE 120 WBE 140
Minimum inlet valve stem
diameter 5,32 mm
Minimum exhaust valve stem
diameter 5,27 mm
Minimum inlet valve head rim
thicknesse 0,50 mm
Minimum exhaust valve head
rim thickness 0,50 mm
Minimum valve spring length 34,50 mm
Maximum gap between ends of
cylinder rings 1,0 mm
Max. axial gap for compression
rings 0,15 mm
Minimum gudgeon pin diameter 12,95 mm
Max. gudgeon pin-piston seat
diameter 13,05 mm
Maximum
connecting
rod diameter
gudgeon pin
side 13,07 mm
crank side 26,07 mm
Diam. connecting rod’s pin on
engine shaft 25,92 mm
Verify the engine shaft extremes 0,10 mm
Diameter Pump seat on camshaft
13,92 mm
Diameter aspiration cam 27,30 mm
Diameter discharge cam 27,45 mm
3.2. Technical data
WBE 170
Displacement 166 cc
Bore 65 mm
Stroke 50 mm
Compression ratio 8,1 : 1
Speed (r.p.m.)
2900 (±100)
Fuel tank capacity 0,75 litres
Oil sump capacity 0,50 litres
Dry weight 8,50 kg
3.3. Adjustments
Distance between spark plug
electrodes 0,7 - 0,8 mm
Coil air gap 0,4 ± 0,05 mm
Inlet valve clearance 0,10 - 0,15 mm
Exhaust valve clearance 0,15 - 0,20 mm
Year of
manufacture
Date
WBE170 18162014 EURO(V)
484479-30/ME110003424/120
WBE170 18162014 EURO(V)
484479-30/ME110003424/120
<< BACK >>
INDEX

Release 00 - 11/2018
page 10
Engine WBE 170
Workshop Manual
3. TECHNICAL DATA AND SPECIFICATIONS
3.6. Tightening torques
6-10 Nm
5-7 Nm
11-13 Nm 5-7 Nm 8-12 Nm
5-7 Nm
55-65 Nm
8-12 Nm
8-12 Nm
5-7 Nm
8-12 Nm 6-10 Nm
8-12 Nm
8-12 Nm
25-32 Nm
8-12 Nm
22-30 Nm
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 11
Workshop Manual
3. TECHNICAL DATA AND SPECIFICATIONS
3.7. Table of Tightening torques
Chapter Ref. Description of screw Tightening torques
5Tank xing screw 8 - 12 Nm
5 - 6 Fixing nuts, starter assembly 6 - 10 Nm
6 Starter screw 8 - 12 Nm
7 Starter motor mounting screws 22 - 30 Nm
9 Fixing nuts carburettor and lter 6 - 10 Nm
10 Fixing plate screws 5 - 7 Nm
11 - 14 Fixing screw AUTO-CHOKE 5 - 7 Nm
12 - 15 Spark plug tightening torque 25 - 32 Nm
12 Fixing screw reel 8 - 12 Nm
12 Coil xing stud 8 - 12 Nm
12 Brake support screws 8 - 12 Nm
14 Mufer protection xing screws 8 - 12 Nm
14 Screws valve cover 8 - 12 Nm
15 Flywheel xing nut 55 - 65 Nm
15 Blow-by closure plate screws 5 - 7 Nm
16 Union screws under carter and sump 8 - 12 Nm
16 Counterweight governor xing screw 5 - 7 Nm
16 Fixing screws lower connecting rod cap 11 - 13 Nm
P.S. For the coupling tourque of all standard screws refer to the single table.
<< BACK >>
INDEX

Release 00 - 11/2018
page 12
Engine WBE 170
Workshop Manual
3.8. Identicationofengineunits
For ease of reference, this manual has subdivided maintenance operations into different sections, each of
which refers to an engine component unit as indicated in the diagrams below.
3. TECHNICAL DATA AND SPECIFICATIONS
Ignition
Ignition
Carburation control
Carburation control
Engine block
Engine block
Air intake
Air intake
Turning off and Stopping
Turning off and Stopping
Exhaust system
Exhaust system
Starting system
Starting system
Tank and Supply
Tank and Supply
Carburettor
Carburettor
(AUTO-CHOKE)
system
(AUTO-CHOKE)
system
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 13
Workshop Manual
4. ENGINE TUNING AND TESTING
4.1. Operating guidelines
The engine requires a series of interventions (shown in the table below) in order to ensure minimum basic
maintenance.
Operation First 5 hours Every 5 hours
or daily
Every 25
hours or
every season
Every 50
hours or
every season
Every 100
hours
Check oil level -■---
Change oil *(1) ■- - ■-
Clean mufer and engine -■---
Check air cleaner *(2) -■---
Replace air cleaner *(2) - - ■- -
Check spark plug ---■-
Replace spark plug ----■
*(1) Replace the oil every 25 hours if the engine is working at full load or at high temperatures.
*(2) Clean the air lter more often if the machine is working in dusty areas.
For the operations that are not difcult for the nal
user the assistance centre must maintain the mo-
tor in perfect efciency, in accordance with two
intervention lines:
- Tuning the engine whenever possible.
- Recommending the client a routine maintenan-
ce program at set intervals (e.g. at the end of
the season or before a long period of inactivity).
4.2. Engine tuning program
As part of general engine tuning or any intervention
on the lawn tractor, it is recommended that the Ser-
vice Centre performs a series of operations aimed
at maintaining the engine’s efciency.
Tuning should involve:
- external blowing and cleaning the cylinder
head, cylinder and mufer by removing any
remains of grass and mud;
- checking the oil level, topping up or replacing
parts if necessary;
- inspecting the condition of the starter rope and
checking that it functions correctly [ 6.2];
- cleaning the lter element [ 8.1];
- emptying and cleaning the fuel tank and che-
cking the breather pipe [ 5.2];
- adjusting the speed [ 10.1]
- inspecting the condition of the spark plug;
checking the distance between the electrodes
[ 12.1];
- tightening the screws [ 3.7];
- functional test [ 4.3].
Should the checks and adjustments fail to achieve
a satisfactory result, refer to chapter [ 17] for
troubleshooting
.
<< BACK >>
INDEX

Release 00 - 11/2018
page 14
Engine WBE 170
Workshop Manual
4.3. Functional test
A functional test needs to be carried out at the
end of each servicing operation, to check that the
operations made are effective. The test must be
performed in compliance with the safety regula-
tions regarding the use of the lawnmower on which
the engine is installed.
The functional test is carried out as follows:
a. Refuelling and checking the supply system
When you have refuelled the tank with new petrol,
check the seal of the tank, the cap and the car-
burettor pipe.
b. Hot and cold starting test
The engine is equipped with intelligent starter sy-
stem (AUTO-CHOKE), perform some cold and hot
starts to make sure they happen regularly
c. Check the engine rpm
When the engine is hot enough, check the engine
speed; the reading should be equal to the speci-
cations [ 3.2].
If all of these operations have a positive result, the
engine can be considered fully serviceable and be
returned to the client.
4. ENGINE TUNING AND TESTING
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 15
Workshop Manual
5. TANK AND SUPPLY
IMPORTANT: Carefully read the information below before commencing any intervention.
General Information
The fuel supply system comprises the petrol tank connected to the carburettor by a pipe; a mesh lter at
the bottom of the tank prevents deposits and impurities from reaching the carburettor.
The tank is equipped with a lter, located at the bottom of the tank, which prevents deposits and impurities
from reaching the carburettor.
The supply to the carburettor oat chamber is caused by gravity and the volume of petrol taken from the
tank as the engine runs is compensated by a breather pipe in the cap.
See the relevant section [ 17] for advice on resolving problems due to the malfunctioning of the petrol
supply system.
WARNING: All interventions on the supply system must be performed in safe conditions, therefore:
- do not smoke;
- always empty the tank;
- workinaventilatedenvironmentawayfromnakedamesorunprotectedsourcesofheat;
- collect any remaining petrol by positioning a suitable container under the engine, avoiding soiling the
work bench;
- remove all traces of spilt petrol immediately;
- check you have connected the pipes before pouring petrol back into the tank..
<< BACK >>
INDEX

Release 00 - 11/2018
page 16
Engine WBE 170
Workshop Manual
WBE170 18162014 EURO(V)
484479-30/ME110003424/120
484479-30/ME110003424/120
5.1. Emptying and removing the tank
1 - Remove the ring (1) of the petrol pipe (2) from
the tank side and drain all the fuel from the tank
and the pipe into a suitable container.
2 - Remove the cover (3) by unscrewing the three
nuts (4).
3 - Uncouple and remove the conveyor (5).
4 - Loosen the two rear screws (6) and remove the
tank (7).
5 - When tting, perform the above operations in
reverse
WARNING:Beforerellingthetankwithnew
fuel, check that the petrol pipe is intact.
5. TANK AND SUPPLY
7
6
5
6
1
2
3
4
4
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 17
Workshop Manual
9
8
5. TANK AND SUPPLY
5.2. Cleaning the tank
1 - Remove the tank [ 5.1].
2 - Slide out the lter tube (8) and blow compressed
air through it so as to remove any deposits inside.
3 - Keeping the hole (9) in the spigot closed, pour
about 100 cc of clean petrol into the tank and
shake it vigorously to clean the inside.
4 - Empty the tank and dispose of the petrol used
for cleaning in accordance with the laws in force.
5 - Ret the tank [ 5.1] tightening the screws
(6) to the torques indicated.
6 - Replace the starter assembly by securing the
nuts (4) at the specied torque.
WARNING:Beforerellingthetankwithnew
fuel, check that the petrol pipe is intact.
5.3. Checking and cleaning the breather pipe
1 - Remove the cap (10) and pull out the gasket
(11) and the sponge (12).
2 - Check that:
- the gasket (11) is intact and without cracks or
ssures;
- the air passages (13) inside the cap are not clog-
ged;
- the sponge (12) is not crushed or broken.
NOTE: Always replace the entire cap if the
gasket or sponge is damaged.
Tightening torques
4Fixing nuts, starter assembly 6-10 Nm
6Tank xing screw 8-12 Nm
10
10
11
12
13
<< BACK >>
INDEX

Release 00 - 11/2018
page 18
Engine WBE 170
Workshop Manual
General information
The starter assembly inside the cover consists of a rope wound around a pulley. The movement from the
pulley to the ywheel (and therefore to the engine shaft) is transmitted through a pair of couplings. The
return of the pulley and the rewinding of the rope are obtained from a spiral spring.
See the relevant section [ 17] for advice on resolving problems due to the malfunctioning of the star-
ting system.
6. STARTING SYSTEM ( manual starter)
6.1. Removing the starter assembly
1 - To get access to the starter assembly (1), the
cover (2) must be removed by unscrewing the
three nuts (3).
2 - Ret the starter assembly (1) by tightening the
cover nuts (3) to the torque indicated.
6.2. Replacing the rope
1 - Remove the starter assembly [ 6.1].
2- Keep hold of the pulley (4) and, with the help of
a screwdriver, slowly unwind (clockwise) the entire
rope (5) from the pulley. Then carefully release the
pulley in order to gradually unload the return spring.
If the rope breaks, the spring will be already rele-
ased and you will only have to unwind the rope.
3 - Undo or cut the knot at the end of the rope (5)
and remove the section still attached to the pulley.
5
5
4
4
2
3
31
<< BACK >>
INDEX

Release 00 - 11/2018
Engine WBE 170
page 19
Workshop Manual
6. STARTING SYSTEM ( manual starter)
4 - Rotate the pulley (4) through about 7 complete
turns anticlockwise in order to load the spring and
hold it still.
5 - Insert one end of the rope (5) (ø 3,2mm - length
2200mm) through the guide in the ventilation grille,
into the hole in the pulley (4), and fasten it by tying
a knot.
6 - Insert the other end of the rope into the grip
(6), fasten it with a knot and carefully release the
pulley to allow the rope to rewind itself completely
onto the pulley.
7 - Check that the pulley rotates freely.
8 - After pulling the entire length of the rope, check
that the pulley (4) is able to complete another 2-3
turns before compressing the spring.
9 - Ret the starter assembly [ 6.1].
6.3. Replacing the hooks
1 - Remove the starter assembly [ 6.1].
2 - Undo the screw (7) and remove the cover (8)
setting aside the spring. Take care that the pulley
(4) does not slide out of its housing.
3 - Move the return springs (9) gently out of the way,
rotate the hooks (10) clockwise and remove them.
NOTE: Always replace the complete set
consisting of hooks, return springs, cover and
screw, as a unit.
4 - When tting, tighten the screw (7) to the torque
indicated.
5 - Ret the starter assembly [ 6.1].
Tightening torques
3
Fixing nuts, starter assembly 6-10 Nm
7Starter screw 8-12 Nm
Technical information
Starter rope dimensions ø 3,2x2200 mm
6
5
4
7
8
9
10
4
<< BACK >>
INDEX

Release 00 - 11/2018
page 20
Engine WBE 170
Workshop Manual
7. STARTING SYSTEM ( electric starter)
General information
The electric starter unit consists of a motor powered by a 12 Volt battery (mounted on the engine).
See the relevant section [ 17] for advice on resolving problems due to the malfunctioning of the star-
ting system.
2
1
7.1. Removing the starter motor
1 - Disconnect the connector (1) from the wiring.
2 - Unplug the power cable (2).
3 - Unscrew the two screws (3) and remove the
motor.
4 - When assembling, follow the above operations in
reverse order and ret the fuel supply pipe as well.
3
<< BACK >>
INDEX