Technical Information · issue 50 of 2002
New Model BG 46
IssueTI 50/2002
Full text
Page 1 of 6
Technical Information
50.2002
New Model BG 46 Blower – Series 4229
Contents
1. Technical Description
2. Specifications
3. Special Accessories
4. Service Accessories
5. Repairs
6. Spare Parts
The new STIHL BG 46 is the latest edition to the line Typical applications are:
of handheld blowers.
Yard, garden and landscape maintenance.
The BG 46 achieves a sound pressure level Use in noise-sensitive environments (such as
comparable to that of electric units and is, therefore, schools and public facilities).
also suitable for use in residential areas.
The engine is accommodated in a compact housing.
TI_50_2002_01_01_01.fm english / USA
)m~ge 2 Technical Information 50.2002
1. Technical Description 2. Specifications
Crankshaft
2.1 Powerhead
. Multi-part, pressed together to form torsionally
rigid unit 2.1.1 Engine
. Supported in bearings at both ends Displacement: 1.66 cu.in (27.2 cm3)
Bore: 1.34 in (34 mm)
Cylinder Stroke: 1.18 in (30 mm)
. Four-port technology (better mixture control, Engine power to 0.88 HP (0.65 kW)
optimum combustion, reduced emissions) ISO 8893: at 6,400 rpm
Engine speeds: see 2.1.2
. Large cooling area
Rewind starter: Single pawl system
Starter rope: 0.120 in (3 mm) diameter,
Carburetor 41.4 in (1050 mm) long
. New carburetor with three adjusting screws and
limiter caps
. User can tune the carburetor by adjusting the Model Air flow Air - Sound
high speed screw (H) within a limited range (see rate velocity pressure level
5.1.4) under load
. Insides of all caps are funnel shaped to ease
insertion of screwdriver
fo at 15 m (49 ft.)
ANSI B 175.2
cfm M.P.H. dB (A)
BG 46 391 125 64
Air filter
. Improved filter material with longer life (foam
and felt)
2.1.2 Fuel System
. Larger effective filter surface area Carburetor: All position diaphragm carburetor with
integral fuel pump
Exhaust muffler
Standard setting see 5.1.3
. Dual chamber muffler Idle speed 2,500 to 3,100 rpm
Easy start system Fuel tank capacity: 0.85 US pt (0.4 L)
. Additional purge primer
. ElastoStart (special accessory)
2.1.3 Ignition System
Ignition module: electronic magneto ignition
Controls
Spark plug (resistor Bosch WSR 6F or
. Multi-function handle type): NGK BPMR 7 A
. Lockable throttle trigger for setting operating
RPM 2.2 Weight
without blower tube 9.4 lbs (4.3 kg)
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Technical Information 50.2002 Page 3
3. Special Accessories
Part Name Part No. Application
ElastoStart 0000 190 3404 Rewind starter (grip with rope)
Gutter cleaning attachment 4229 007 1001 Cleaning roof gutters
Fan nozzle 4229 708 6301
4. Service Accessories
4.1 Special Servicing Tools
Special servicing tools are listed in the service
manuals for the STIHL series 4140 powerhead
(basic engine) and STIHL series 4140 attachments.
4.2 Servicing Aids fo
Part Name Part No. Application
Carburetor parts kit 1129 007 1062 Zama C1Q-S73
Set of gaskets 4229 007 1050 Engine
Standard commercial, solvent- Cleaning the crankshaft stub
based degreasant without
chlorinated or halogenated
hydrocarbons
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)m~ge 4 Technical Information 50.2002
5. Repairs 5.1.2 Function
If the machine is started up in the course of repairs,
it is essential to observe all country-specific safety
regulations and the safety precautions outlined in
the instruction manual.
5.1 Carburetor 270°
5.1.1 Construction
233TI023 KN
The cap limits the range of adjustment of the high
speed to 270 degrees (3/4 turn).
5
1
5.1.3 Servicing / Repairs
2
233TI021 KN
4
. Low speed screw (1) with cap
. High speed screw (2)
. Cap (3) for high speed screw
293TI001 KN
. Idle speed screw (4) with cap
. Stop (5)
The cap on the high speed screw has to be removed
to replace a damaged high speed screw or clean the
carburetor.
. Use the puller 5910 890 4501 (special tool) to
remove the caps.
Do not re-install used caps because they are
damaged during removal.
lin 233TI022 KN
Adjustment after servicing / repairs
. Check the air filter and clean or replace as
necessary.
The cap is pushed onto the high speed screw. The
stop is between the high speed and low speed . Check the spark arresting screen and clean or
screws. replace as necessary.
. Check the fuel filter and replace as necessary.
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Technical Information 50.2002 Page 5
Standard setting of H screw Adjusting idle speed
H L
293TI004 KN
293TI002 KN
. Open H screw 1 1/2 turns . Use idle speed screw (LA) to set engine speed
to 2,800 rpm.
. Open L screw 1 full turn
This adjustment must be checked with a
. Start the engine and open the throttle several
tachometer.
times – check that engine accelerates smoothly.
. If necessary, open the H screw no more than
another 1/4 turn. Checking running behavior
.
Open the throttle several times to check that the
Installing the cap engine accelerates properly.
. The engine must run smoothly at idle speed.
5.1.4 Setting instructions for users
H
293TI003 KN
270°
Do not re-install used caps because they are
damaged during removal.
233TI023 KN
. Line up the new cap for the H screw so that it is
against the rich stop and push it on as far as the
second distinct detent position. The user can adjust the H screw only within a range
Do not push the cap against the carburetor of 270 degrees.
body as it will otherwise be damaged.
This enables the carburetor setting to be tuned to
changes in operating conditions. For example:
– Different altitude (mountains – sea level)
The procedure for setting the carburetor is
described in the instruction manuals (see chapter
"Adjusting the Carburetor").
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)m~ge 6 Technical Information 50.2002
5.2 Tightening Torques .
Tightening torques are listed in the service manuals Code Type of Repair BG 46
for the STIHL series 4140 powerhead (basic
engine) and STIHL series 4140 attachments. 1 Crankcase, Crankshaft, *1.2
Crankshaft Bearings
2 Replace Short Block 1.0
3 Crankcase Gasket/Sealing 1.0
5.3 Service Note
4 Crankshaft Seals 1.0
For servicing and repair procedures on the BG 46
(includes pressure & vacuum
refer to the service manuals for the STIHL series
testing)
4140 powerhead and STIHL series 4140
attachments. 5 Cylinder and/or Piston 0.8
6 Ignition Module 0.4
These service manuals contain no chapters on
7 Fuel House 0.3
"Servicing the Carburetor" or "Troubleshooting" and
no standard repair procedures. Such repair 8 --- ---
procedures are described in the separate 9 Repair/Rebuild Carburetor 0.6
"Carburetors" and "Standard Repairs and 10 Replace Carburetor, Carburetor 0.4
Troubleshooting" handbooks. Jet (If tried to repair use code 9)
11 Throttle Control, Throttle Cable 0.3
5.4 Repair Times 12 Recoil Starter 0.3
The specified repair times assume that the work is
performed by trained personnel in a properly
13 fo
Fan housing, Fan Wheel,
Flywheel
0.3
equipped service workshop. 14 Discharge Tube, Elbow 0.2
The repair times are given in hours 15 Muffler 0.5
(0.1 = 6 minutes). 16 Air Filter, Filter Cover, Tank Cap, 0.3
Fuel Filter, Tank Vent, Spark
Plug, Muffler Screen,
Note: This table for the BG 46 can be added to the
Miscellaneous Minor Repairs
STIHL repair timetables manual.
17 Stop Switch 0.3
18 Fuel Tank, Fan Housing Half 0.5
with Fuel Tank
19 --- ---
6. Spare Parts 20 All Other Repairs 0.4
The new machine is included in the existing
illustrated parts list for models BG 45, 55, 65 and 85. 50 No Labor 0.0
* Recommend to replace with short block (code 2).
© 2002 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-ja 7694
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