Technical Information · issue 7 of 2007
New STIHL MS 192 C chain saw
IssueTI 7/2007
Engine family 1137
Full text
Page 1 of 10
STIH)
Technical Information 07.2007
New STIHL MS 192 C chain saw – Series 1137
Contents
1. Technical description
2. Specifications
3. Service accessories and special tools
4. Service notes
5. Spare parts
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)m~ge 2 Technical Information 07.2007
With a total weight of just 3.3 kg (7.4 lbs), the new 1.2 STIHL Easy2Start™
model MS 192 C is the lightest rear handle chain . Standard feature
saw in the STIHL line.
. Compact, lighter STIHL Easy2Start™ of the
Thanks to the STIHL Easy2Start™ which is included latest generation.
as a standard feature and the integrated fuel purge
pump, the MS 192 C can be started conveniently. 1.3 Oil and fuel tank
1. Technical description
1.1 Power unit
STIHL single cylinder two-stroke engine
Cylinder
. Four transfer ports system for better
combustion.
151TI001 KN
Piston
. Two piston rings for optimum performance and
longer service life. . Toolless caps for ease and comfort.
. Simple fill up provided by a large, easily-
Crankshaft accessible tank opening.
. Reduced weight crankshaft. . Fuel level always visible through transparent
tank.
Carburetor
. All position diaphragm carburetor with full-
1.4 Manual fuel pump
throttle semi-fixed jet, idle fixed jet and
premixture regulation.
. The setting range of the high speed adjusting
screw is restricted by a limiter cap (approx. 3/4
turn).
. Accelerator pump for quick acceleration.
Ignition system
. Microprocessor-controlled ignition system with
151TI002 KN
ignition timing adjustment for optimum
performance and torque.
. Manual fuel pump for easy prime and to
Air filter comfortably start cold machines.
. Easily accessible.
. Fleece filter
Muffler
. Single-chamber muffler, with spark-arresting
screen.
Clutch
. With three clutch shoes.
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Technical Information 07.2007 Page 3
2. Specifications 2.3 Ignition system
Ignition module: Microprocessor-
2.1 Power unit controlled with
STIHL single cylinder two-stroke engine adjustment of the
ignition timing
Displacement: 30.1 cm3 (1.84 cu. in.) Spark plug (suppressed): NGK CMR6H
Bore: 37 mm Electrode gap: 0.5 mm (.020 in.)
Piston stroke: 28 mm
Power output to ISO 7293: 1.3 kW (1.7 bhp)
Idle speed: 3,000 rpm
Permissible max. speed 2.4 Chain lubrication
with bar and chain: 13,500 rpm Oil pump: Speed-dependent, fully-
Weight (no fuel, without automatic pump with
bar and chain): 3.3 kg (7.4 lbs) rotary piston
Oil tank capacity: 220 cm3 (7.4 oz)
2.2 Fuel system
Carburetor
All-position diaphragm carburetor with limiter cap 2.5 Recommended cutting attachments
on the high speed adjusting screw and integral fuel Guide bar: Rollomatic with sprocket
pump. nose
Standard limiter cap setting on the H screw Bar lengths: 30, 35 and 40 cm
(12" to 16")
Low speed screw L: 1 turn open
Oilomatic saw chains: 3/8" Picco-Micro-Mini
High speed screw H: 3/4 turn open (PMN)
(max. to stop) Drive link gauge 1.1 mm
(.043 in.)
Chain pitch: 9.32 mm (3/8")
Basic setting without limiter cap (when
performing repairs)
Sprocket wheel: 6-tooth for 3/8" P (spur
Low speed screw L: 1 turn open sprocket)
High speed screw H: 1 turn open
Fuel capacity
270 cm3 (9.1 oz)
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3. Service accessories and special
tools
3.1 Service accessories
Part name Part No. 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
STIHL special lubricant 0781 417 1315 Bearing bore in rope rotor, rewind spring in fan housing
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
STIHL Press Fluid OH 723 0781 957 9000 Rubber elements
3.2 Special tools
New tools, must be purchased for the
STIHL MS 192 C
151TI007 KN
Part name Part No. Use
Locking strip (piston stop) 0000 893 5904 Block crankshaft
All other special tools are listed in the service
manual STIHL MS 192 T.
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Technical Information 07.2007 Page 5
4. Service notes 4.1.2 Maintenance / repair
4.1 Carburetor adjustment
The limiter cap for the high speed adjusting screw
must be removed when replacing a damaged
The high speed adjusting screw H can only be adjusting screw or when cleaning the carburetor.
adjusted by the user within a range of 270° (3/4 . Remove limiter cap with
turn). puller 5910 890 4501 (1).
The carburetor has been adjusted for optimum Used caps must not be reused, as they are
performance and fuel efficiency. damaged when removed.
Fine adjustments are still possible to adapt to
changed conditions of work and use such as Adjustment after maintenance / repair
changes in elevation (mountains, sea-level).
. Check air filter – clean or replace if necessary.
4.1.1 Mechanical design . Check spark arresting screen – clean or replace
if necessary.
. Check the chain tension.
. Low speed adjusting screw (1).
. High speed adjusting screw (2).
. Limiter cap (3).
. Idle speed adjusting screw (4).
. Limit stop (5).
The limiter cap is fitted over the knurled head of the
adjusting screw. The stop on the carburetor housing
serves as a limiter.
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)m~ge 6 Technical Information 07.2007
4.1.3 Basic setting without limiter cap 4.1.4 Securing the limiter cap
. Starting from the closed position of the adjusting Used caps must not be reused, as they are
screw: damaged when removed.
. Fit a new limiter cap (1) for the H screw so it
Open H = 1 turn lines up with the rich stop (arrow).
Open L = 1 turn
Set the recommended speeds within the tolerance a
range of +/– 200 rpm.
1. Set idle speed to 3,500 rpm with adjusting
screw (LA).
2. Turn the low speed screw (L) clockwise or
counterclockwise to set the highest speed.
If this speed is greater than 3,900 rpm, stop and
repeat step 1.
256TI027 KN
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 . Press on limiter cap until it snaps into place.
screw (L).
5. Set the maximum speed of 13,500 rpm with the Do not press the limiter cap fully home on the
high speed adjusting screw (H). carburetor housing, otherwise it will be damaged:
Minimum distance a = 1 mm
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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Technical Information 07.2007 Page 7
4.1.5 Standard setting with limiter cap 4.3 Oil seals
The limiter cap must not be removed when making It is not necessary to disassemble the complete
the standard setting. engine in order to replace the oil seals.
. Turn the high speed screw (H) counterclockwise 1 = Oil seal 9639 003 1205
as far as possible (max. 3/4 turn). 2 = Oil seal 9639 003 1206
. Turn the low speed screw (L) clockwise – until
lightly seated – then back off 1 turn. Different oil seals are available for installing in a
assembled or dis-assembled crankcase.
4.2 Accelerator pump . Install oil seal (1) 9639 003 1205 in the dis-
assembled crankcase.
. Install oil seal (2) 9639 003 1206 in the
assembled crankcase.
. Coat outer diameter with Dirko sealing
compound.
4
5 1 . Grease sealing lips.
3
2
151TI009 KN
The carburetor is equipped with an accelerator
pump.
The pump piston (1) is located in the bore (2) behind
the throttle shaft (3) and is held in idle position by
the compression spring (4). The bore is sealed by
plug (5).
When opening the throttle shutter, fuel is also sent
through the main nozzle into the venturi providing
fast acceleration.
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4.4 Chain catcher 4.5 Sprocket and worm
The chain catcher (1) is molded onto the sprocket The worm for the oil pump must match the number
cover. Replace damaged or broken chain catchers. of teeth of the sprocket.
. File down the molded chain catcher (1). When a sprocket is replaced 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
8-tooth 1/4" 1137 640 2002 1129 640 7102
4.6 Spark plug boot
. Fit chain catcher (2) 1129 656 7701 as
replacement with screw (3) 9074 477 4130.
151TI003 KN
The spark plug boot is provided with a tab for easy
removal.
. Use a suitable tool to grip the tab and pry out the
spark plug boot.
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Technical Information 07.2007 Page 9
4.7 Unhook throttle rod 4.8 Remove tank vent
151TI006 KN
. Place locking strip 0000 893 5903 under handle
housing.
. Pry out tank vent.
151TI004 KN
. Set throttle trigger to full throttle position.
. Unhook throttle rod with needle nose pliers.
151TI005 KN
Installing the throttle rod:
. The throttle rod must be located in the front hole
(arrow) of the lever on the throttle shaft.
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4.9 Block crankshaft 4.11 Service manual
Service and repair procedures are specified in the
service manual MS 192 T. Service notes for unique
assemblies in the MS 192 C are contained in this
Technical Information bulletin.
4.12 Repair times
Repair times for the MS 192 C are identical to those
specified for the MS 192 T.
5. Spare parts
A separate spare parts list is available for the new
151TI008 KN machine.
The new locking strip 0000 893 5904 is used to
block the crankshaft.
. The locking strip must make contact with the
cylinder wall when it is fitted.
. Position of the locking strip as illustrated – all
other positions may result in damage to the
piston.
4.10 Location of the serial number
The serial number is on the tank housing below the
hand guard.
© ANDREAS STIHL AG & Co. KG, 2007 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.