Technical Information · issue 2 of 2005
New STIHL MS 192 T Tree Surgery Chainsaw
IssueTI 2/2005
Engine family 1137
Full text
Page 1 of 12
STIH)
Technical Information 02.2005
New STIHL MS 192 T Chainsaw – Series 1137
Contents
1. Technical description
2. Specifications
3. Service accessories and special tools
4. Service notes
TI_02_2005_30_01_01.fm englisch / English USA
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The new STIHL MS 192 T chain saw is tailored for 1. Technical description
professional tree care.
The STIHL MS 192 T features: 1.1 Engine
- Fuel cap openable without tools STIHL single cylinder two-stroke engine
- Transparent tanks Cylinder
- Manual fuel pump . Four-port system for optimum performance
- Side chain tensioner
- Microprocessor-controlled ignition system for Piston
smooth starting . Two piston rings for optimum performance over
Even with its light weight, the STIHL MS 192 T a long service life.
offers powerful torque. The accelerator pump in the
carburetor and the microprocessor-controlled
Crankshaft
ignition system are designed to provide fast
acceleration and generate a clean cut. . Multi-part, durable crankshaft
Along with the compact design, the MS 192 T is
easy to service. All service-related components are Carburetor
accessible in a few easy steps.
. Diaphragm carburetor with full-throttle partially
fixed nozzle, and idle fixed nozzle
. The setting range of the main set screw is
limited by a limiter cap (approx. 3/4 turn). This
limitation ensures greater operating safety and
maintenance of future exhaust emission levels
. Accelerator pump for faster acceleration
(see 4.3).
Ignition System
. Microprocessor-controlled ignition system with
ignition timing adjustment for stable idling,
smooth starting, and optimum performance and
torque
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Technical Information 02.2005 Page 3
Air filter 1.3 Service-friendly design
. Easily accessible All service-relevant components are accessible in a
few steps.
. Felt filter for normal operating conditions
. Fabric filter (accessory) for use in snow
Fanwheel side
conditions.
Muffler
. Single-chamber muffler, with spark-arresting
screen
Clutch
. With three metal clutch shoes.
1.2 Interior sprocket
. Only remove four screws to access the ignition
module, flywheel and rewind starter.
Sprocket side
The internal sprocket reduces the distance between
the handle and cutting plane.
. Only one nut has to be removed to access the
muffler, sprocket, clutch and chain tensioner.
Carburetor and air filter
. Air filter accessible without special tools
. Only remove two nuts to access the carburetor
and tank vent
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1.4 Oil and fuel tank 2. Specifications
2.1 Engine
STIHL single cylinder two-stroke engine
Displacement: 1.84 cu.in (30.1 cm³)
Bore: 1.46 in (37 mm)
Stroke: 1.10 in (28 mm)
Engine power to
ISO 7293 1.7 HP (1.3 kW)
Idle speed: 3,000 rpm
Permissible max. speed
. Fuel caps with a folding clip for easy and with bar and chain: 13,500 rpm
comfortable handling without tools
Weight (no fuel, without
. Simple fill up provided by large, easily- bar and chain): 6.6 lbs (3.0 kg)
accessible tank opening
. Fuel level visible through transparent tank
2.2 Fuel System
1.5 Manual fuel pump Carburetor
All position diaphragm carburetor with limiter cap on
the main H setting screw and integrated fuel pump
Standard limiter cap setting on the H-screw
Low-speed screw L: 1 turn open
High speed screw H: 3/4 turn open
(max. to stop)
Basic setting without limiter cap
. Manual fuel pump for easier starting of cold Low-speed screw L: 1 turn open
machines High speed screw H: 1 turn open
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Technical Information 02.2005 Page 5
Fuel capacity
0.57 US pt (0.27 l)
2.3 Ignition System
Ignition module: Microprocessor-
controlled with
automatic adjustment of
the ignition timing
Spark plug (suppressed): NGK BPMR 7 A
Electrode gap: 0.020 in (0.5 mm)
2.4 Chain Lubrication
Oil pump: Speed-dependent, fully-
automatic pump with
rotary piston
Oil tank capacity: 0.46 US pt (0.22 l)
2.5 Recommended cutting attachments
Only use low-kickback chains.
Guide bar: Rollomatic with sprocket
nose
Bar lengths: 12, 14 and 16 in
Oilomatic saw chains: Picco-Micro Mini (PMN)
Drive link thickness
0.043 in (1.1 mm)
Picco-Micro 1 (PM 1)
Drive link thickness
0.050 in (1.3 mm)
Chain pitch: 3/8’’ (9.32 mm)
Sprocket wheel: 6-tooth for 3/8" P
(spur sprocket)
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3. Service accessories and special
tools
3.1 Service accessories
Part name Part number Use
Grease (225 g tube) 0781 120 1111 Oil seals, oil pump drive, sprocket bearings, chain tensioner
Bearing and sliding surfaces for throttle trigger, brake lever
and trigger interlock
Standard commercially Cleaning crankshaft stub and cone on flywheel
available CFC and HFC-free
solvent-based degreasing
agent
Sealing compound 0783 830 2000 Engine pan, oil seals (outside diameter)
Dirko HT red sealant
3.2 Special Servicing Tools
To be used for the STIHL MS 192 T
Part name Part number Use
Clamping strap 1137 893 2600 Installing the piston
The available special tools are listed in the repair
instructions for the STIHL MS 192 T.
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4. Service notes 4.1.1 Mechanical design
4.1 Carburetor Adjustment
. Low speed adjusting screw with cap (1)
. High speed adjusting screw (2)
With this carburetor, the high speed adjusting
screw H can only be adjusted by the user within a . Limiter cap (3)
range of 270° (3/4 turn). . Idle speed adjusting screw (4)
The carburetor has been adjusted for optimum . Stop (5)
performance and fuel efficiency in all operating
The limiter cap is fitted over the knurled head of the
conditions.
adjusting screw. The stop on the carburetor housing
Fine adjustments are still possible to adapt to serves as a limiter.
changed conditions such as changes in elevation
(mountains vs. sea-level).
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4.1.2 Maintenance / repair 4.1.3 Basic setting without limiter cap
The limiter cap for the main H setting screw must be . Starting from the closed position of the adjusting
taken off when exchanging a damaged H screw or screw:
cleaning the carburetor. Back off H = 1 turn
Back off L = 1 turn
. Remove the limiter cap with a suitable tool (1)
A used cap may not be reused, as they are
Set the specified speeds within the tolerance range
damaged when pulled off.
of +/– 200 rpm.
1. Set idle speed to 3,500 rpm with idle speed
Adjustment after maintenance / repair
adjusting screw (LA).
. Check air filter – clean or replace if necessary. 2. Turn the low speed screw (L) clockwise or
. Check spark arresting screen (if installed) – counterclockwise to set the highest speed.
clean or replace if necessary.
If this speed is greater than 3,900 rpm, stop and
. Check fuel filter – replace if necessary. start again with step 1.
. Check the chain tension – adjust as needed. 3. Set the speed to 3,500 rpm again with idle
speed adjusting screw (LA).
4. Set the speed to 3,000 rpm with low speed
screw (L).
5. Set the maximum speed of 13,500 rpm with the
high speed adjusting screw (H).
If the setting is too lean, the engine may be
damaged by overheating and a shortage of
lubricant.
6. Continue with "securing the limiter cap".
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4.1.4 Securing the limiter cap 4.2 Standard setting with limiter cap
The limiter cap must not be removed when making
the standard setting.
A used cap may not be reused, as they are
damaged when pulled off.
. Place the new limiter cap (1) for the H screw . Turn the high speed screw (H) counterclockwise
aligned on the stop knob (arrow) as far as possible (max. 3/4 turn).
. Turn the low speed screw (L) clockwise – until
firmly seated – then back off 1 turn.
a
4.3 Accelerator pump
256TI027 KN
. Press on limiter cap until it snaps into place
Do not press on the limiter cap until it contacts the
carburetor housing since it would become
damaged: The carburetor is equipped with an accelerator
Minimum distance a =0.039 in (1 mm) pump.
The pump piston (1) is located in the bore (a) behind
the throttle shaft (3) and is held in the idle position
by a compression spring (2).
When opening the throttle shutter, fuel is also sent
through the main nozzle into the the air cone
(Venturi valve) providing fast and spontaneous
acceleration.
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4.4 Oil seals 4.5 Chain Catcher
It is not necessary to disassemble the complete
engine in order to replace the oil seals.
The chain catcher (1) is molded onto the sprocket
cover. Replace damaged or broken chain catchers.
1 = oil seal 9639 003 1205 . File down molded on chain catcher (1)
2 = oil seal 9639 003 1206
Different oil seals are available for installing in a
closed or open crank case.
. Use oil seal (1) 9639 003 1205 for installation on
an open, disassembled crankcase.
. Use oil seal (2) 9639 003 1206 for installation on
a closed, assembled crankcase.
. Coat outer diameter with Dirko sealing
compound
. Grease sealing lips
. Mount chain catcher (2) 1129 656 7701 as a
replacement with screw (3) 9074 477 4130
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4.6 Sprocket and worm 4.8 Location of the serial number
The worm for the oil pump must match the number The machine’s serial number is on the tank housing
of teeth of the sprocket. below the hand guard.
When replacing the sprocket with another with a
different number of teeth, the worm also has to be
replaced.
Chain Sprocket Worm
6-tooth 3/8" 1137 640 2001 1129 640 7100
7-tooth 3/8" 1137 640 2003 1129 640 7101
4.7 Spark Plug Boot
The spark plug boot is provided with a tab for easy
removal.
. Use a suitable tool to grip the tab and pry out
spark plug boot
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4.9 Repair times
The repair times are specified for trained personnel Repair Description MS 192 T
and a fully equipped service repair shop.
The repair times are specified in minutes. 1 Replace crankcase, crankcase 60
gasket or re-seal crankcase.
Includes air leak test.
2 Replace engine housing. 100
3 Replace crankshaft main 60
bearing(s). Includes air leak test.
4 Replace crankshaft seal(s). 40
Includes air leak test.
5 Perform engine air leak test. 30
6 Replace cylinder and/or piston. 60
Includes air leak test and diagnosis
and repair of component(s) that
caused failure.
7 Replace ignition module or 20
flywheel. Includes stop circuit test.
8 Replace fuel tank line, tank vent, or 20
fuel pick-up body.
9 Replace intake manifold or intake 20
flange, including leak test.
10 Repair or replace carburetor. 25
Includes fuel system testing.
11 Replace fuel tank housing. 100
12 Replace oil pick-up/delivery line. 20
Includes oil output test.
13 Replace oil pump and/or pump 20
drive gear. Includes oil output test.
14 Replace handle frame or handle 30
housing.
15 Repair or replace rewind starter. 20
16 Repair or replace clutch, clutch 20
shoes or clutch springs.
17 Repair chain brake, including 20
check for proper function.
18 Replace muffler. 15
19 Replace air filter or filter housing. 10
20 Repair heated handle(s). -
21 Replace alternator. -
22 Repair or replace stop switch. 15
Includes circuit testing.
40 Miscellaneous repairs and other 15
repairs not listed.
45 Handling allowance only-no labor. 5
50 No labor. 0
© ANDREAS STIHL AG & Co. KG, 2005 Technical Documentation
D1/MTK-ru
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.