STIH) Technical Information Chain saws STIHL MS 231, MS 231 C, MS 251, MS 251 C Series 1143

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1 STIH) Technical Information Chain saws STIHL MS 231, MS 231 C, MS 251, MS 251 C Series 1143 Contents 1. Cylinder with piston, manifold 2. Muffler, muffler gasket, cooling plate 3. Carburetor, filter base 4. Air guide shroud 5. Flywheel, ignition module, wiring harness 6. Summary The abovementioned chain saws are equipped with new "cylinders with piston" within the scope of a model update. The new cylinder has covers stuck to the side and a modified manifold flange. The manifold is secured to the cylinder with 4 screws compared to the previous 3. The piston has been adapted to the new cylinder. 2310TI039 KN Left: Right: previous cylinder new cylinder englisch / English

2 Page 2 Technical Information In addition to the respective new "cylinder with piston", the following new spare parts are required: Component Part number Manifold b 1.2 Bearing plug b 1.3 Muffler (MS 231, b 2.1 MS 231 C) Muffler (MS 251, b 2.1 MS 251 C) Muffler gasket b 2.2 Cooling plate b 2.3 Carburetor C1Q-S b 3.1 Carburetor C1Q-S b 3.1 (for C-BE/C-BEQ) Filter base b 3.2 Air guide shroud b 4 Flywheel b 5.1 Flywheel b 5.1 (for C-BE/C-BEQ) Ignition module b 5.2 Wiring harness b Cylinder with piston, manifold 1.1 Cylinder with piston STIHL MS 231, MS 231 C The new "cylinder with piston Ø 42.5 mm" includes the following new parts: Component Piston Ø 42.5 mm including: Piston ring Ø 42.5x1.2 mm Part number The previous "cylinder with piston", along with the previous piston and previous piston ring remain available for older STIHL MS 251, MS 251 C The new "cylinder with piston Ø 44 mm" includes no new parts: The previous "cylinder with piston" will remain available for older

3 Technical Information Page Manifold The new manifold has been adapted to the manifold flange of the new cylinder and is secured with 4 not 3 screws IS-D4x Muffler, muffler gasket, cooling plate 2.1 Muffler The inside of the new muffler has been changed geometrically / XX Left: previous manifold Right: new manifold TI040 KN 2310TI042 KN Spare parts/service notes The previous manifold will remain available for older 1.3 Bearing plug The new bearing plug has been adapted to the new cylinder MS 231, MS 231 C XX = 03 previous muffler XX = 19 new muffler The previous muffler will remain available for older MS 251, MS 251 C XX = 03 previous muffler XX = 23 new muffler TI041 KN The previous muffler will remain available for older Left: previous bearing plug Right: new bearing plug The previous bearing plug will remain available for older

4 Page 4 Technical Information Muffler gasket The new muffler gasket has been adapted to the new cylinder. 3. Carburetor, filter base 3.1 Carburetor The previous Walbro carburetors have been replaced by new Zama carburetors MS 231, MS TI043 KN WTF 8 S233 Left: Right: previous muffler gasket new muffler gasket The previous muffler gasket will remain available for older 2.3 Cooling plate The cooling plate is also installed in front of the new muffler gasket for the chain saws MS 251, MS 251 C. Left: previous carburetor WTF Right: new carburetor C1Q-S The previous carburetor will remain available for older MS 231 C, MS 251 C only for versions C-BE and C-BEQ 2310TI056 KN WTF 9 S = new cooling plate TI054 KN 2310TI057 KN Left: previous carburetor WTF Right: new carburetor C1Q-S The previous carburetor will remain available for older

5 Technical Information Page Basic settings for servicing The basic settings for servicing, the idle speed and maximum speed are identical to those of the previous carburetors: Settings Basic setting with H L limiter caps fitted: Previous carburetors 1 1/2 1 New carburetors 1 1/ Air guide shroud The new air guide shroud has been changed geometrically and adapted to the new cylinder and the new carburetor (arrows). Idling speed: 2800 rpm Maximum speed: rpm 3.2 Filter base The new filter base has been adapted to the modified geometry of the new carburetors (arrow). Left: previous air guide shroud Right: new air guide shroud with grommet 2310TI047 KN The previous air guide shroud will remain available for older 2310TI046 KN Left: previous filter base Right: new filter base The previous filter base will remain available for older

6 Page 6 Technical Information Flywheel, ignition module, wiring harness 5.1 Flywheel MS 231, MS 251 The new flywheel has holes around the magnet poles and has been adapted to the ignition timing of the new ignition module (b 5.2). 2310TI050 KN Left: previous flywheel Right: new flywheel The previous flywheel will remain available for older Left: previous flywheel Right: new flywheel The previous flywheel will remain available for older 2310TI049 KN 5.2 Ignition module The new ignition module includes modified electronic components MS 231 C, MS 251 C only for versions C-BE and C-BEQ The new flywheel has holes around the magnet poles and has been adapted to the ignition timing of the new ignition module (b 5.2). It also only includes 1 of the following components compared to the previous 2: Component Part number Pawl Torsion spring E-clip DIN Left: designation previous ignition module Right: designation new ignition module The previous ignition module will remain available for older 2310TI051 KN

7 Technical Information Page Wiring harness The new wiring harness has been changed geometrically. The angled plug that is connected to the ignition module, is angled towards the back. Top: previous wiring harness Bottom: new wiring harness Spare parts/service notes The new wiring harness can also be used for older 2310TI053 KN 2310TI052 KN. Connect the angled plug to the ignition module so that the crimped side faces down and away from the cylinder

8 Page 8 Technical Information Summary Item Part Name Previous New Rem. Cylinder with piston, manifold 1 Cylinder with piston Ø 41.5 mm; ) including Items 2, 3 2 Piston Ø 41.5 mm; ) including Item 3 3 Piston ring Ø 41.5x1.2 mm ) 4 Cylinder with piston Ø 42.5 mm; ) including Items 5, 6 5 Piston Ø 42.5 mm; ) including Item 6 6 Piston ring Ø 42.5x1.2 mm ) 7 Cylinder with piston Ø 44 mm ) 2) 8 Manifold ) 2) 9 Bearing plug ) 2) Muffler, muffler gasket, cooling plate 10 Muffler (for MS 231, MS 231 C) ) 2) 11 Muffler (for MS 251, MS 251 C) ) 2) 12 Muffler gasket ) 2) 13 Cooling plate (for MS 251, MS 251 C) ) Carburetor, filter base 14 Carburetor WTF ) 15 Carburetor C1Q-S ) 16 Carburetor WTF ) (for versions C-BE, C-BEQ) 17 Carburetor C1Q-S ) (for versions C-BE, C-BEQ) 18 Filter base ) 2) Air guide shroud 19 Air guide shroud ) 2)

9 Technical Information Page 9 Item Part Name Previous New Rem. Flywheel, ignition module, wiring harness 20 Flywheel ) 2) 21 Flywheel ) 2) (for versions C-BE, C-BEQ); including Items 22, 23, Pawl ) 23 Torsion spring ) 24 E-clip DIN ) 25 Ignition module ) 2) 26 Wiring harness ) 4) Modification to be introduced : continuously Remarks 1) Previous version of part remains available for older models 2) New version of part cannot be used with older machines 3) Previous version of part no longer available from factory 4) New version of part can also be used for older machines 5) Number reduced from 2 to 1 ANDREAS STIHL AG & Co. KG, 2013

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Printed from MediaCat Illustration A Crankcase, Crankshaft Illustration A Crankcase, Crankshaft Ref.Nr. Item code Quantity Description 1 1111 020 2116 1 Crankcase 2-7 2 9371 470 3120 2 Cylindrical pin 6x20 3 9022 341 1010 10