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Most Recent Stihl MS 251 Questions
Ms 251c Oiler Adjustment Screw Location?
Where is the chain bar oiler adjustment on the ms 251C? A supporting image may be helpful...
Where is the chain bar oiler adjustment on the ms 251C? A supporting image may be helpful...
(Posted by support25416 1 month ago)
Need Screw
I have been trying to find a screw supposedly on the bottom of the saw to adjust the oil flow where ...
I have been trying to find a screw supposedly on the bottom of the saw to adjust the oil flow where ...
(Posted by jamessampson64 1 year ago)
Chain/bar Oil Adjustment
Is the amount of oil that lubricates the chain/bar on the MS 251 Easy Start adjustable? If so, where...
Is the amount of oil that lubricates the chain/bar on the MS 251 Easy Start adjustable? If so, where...
(Posted by jboutfishn 1 year ago)
Stihl MS 251 Videos
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Popular Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...
5
2.4 Chain Lubrication
5
2.5 Tightening Torques 6
3. Servicing
the AV System
66
9.1 9.2
9.3
9.3.1 9.3.2 9.4
AV Spring on Oil Tank 66
AV Spring on
Fuel Tank
66
AV Spring on
Handlebar
67
Stop Buffers
68
Buffers on
Machines with
Manual Fuel Pump 85
12.5 Carburetor
88
12.5.1 Leakage Test
89
RA_737_00_01_01
MS 231, MS 231 C, MS 251, MS 251 C
q
© ANDREAS STIHL AG & Co...
Instruction Manual - Page 4
...components and assemblies.
MS 231, MS 231 C, MS 251, MS 251 C
3 Refer to the latest edition of all technical information bulletins are listed in the "STIHL Special Tools" manual.
The special tools mentioned in the illustration above the text
In the illustrations:
A Pointer
a Direction of any replacement parts. Use the part numbers to check the part numbers of movement...
Instruction Manual - Page 5
...overheating.
4
MS 231, MS 231 C, MS 251, MS 251 C Gasoline is otherwise a risk of injury from the fanwheel and a risk of the hoses and the connectors with threadlocking adhesive. Always install new hoses -
Other press fluids are heated for assembly or disassembly. Preparations for servicing
Remove the chain sprocket cover, saw chain and guide bar before re-installing - Coat the...
Instruction Manual - Page 13
...not turn)
...Models with ErgoStart
Guide peg on pawl...Guide pegs on pawls or pawls themselves are worn
Fit new pawls
Torsion springs on flywheel fatigued, pawls worn or sticking
Clean seats on pawls or replace pawls and torsion springs if necessary
Lugs on carrier worn
Install new carrier
Spring loop in spring housing fatigued Install new spring housing
12
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 31
... sprocket cover (1).
- When installing the adjusting wheel, make sure its teeth face the cover plate.
- Check the wing nut (1) and replace if necessary
30
MS 231, MS 231 C, MS 251, MS 251 C Clean all disassembled parts, b 14
-
Remove the chain sprocket cover.
165RA007 TG
533RA058 TG
2310RA048 TG
1
3
: Inspect the cover (1), spur gear set (2), tensioner slide (3) and thrust...
Instruction Manual - Page 47
... the setting gauge.
- do not tighten down yet. Check operation - Rotate the flywheel and make sure it does not touch the ignition module.
46
MS 231, MS 231 C, MS 251, MS 251 C ...setting gauge (1) 1111 890 6400 between the arms of the guides (arrows) and remove the retainer (3).
- The setting gauge is not shown in position.
: Fit the screw (3) with washer - Troubleshooting, b 3.5 Installing...
Instruction Manual - Page 49
...plug boot.
48
MS 231, MS 231 C, MS 251, MS 251 C A new ignition module must be installed if the ignition...Installing
165RA184 TG 165RA188 TG
23 4
- Keep fingers or other parts of the guides, b 7.3
- The engine may start and accelerate during the test...to the spark plug.
: Use adjusting knob (4) to set the spark gap to pierce the center of the troubleshooting chart, b 7.8
7.5 Spark Plug...
Instruction Manual - Page 83
Installing
- Fit the contact spring, b 7.7.4
2310RA317 TG
: Push the filter base (1) onto the
studs (arrows) and the
carburetor.
1
3
2
2310RA149 TG
2310RA315 TG
1
2
- Use STIHL press fluid to simplify assembly, b 14
: Push peg (1) on the other parts in the reverse sequence.
82
MS 231, MS 231 C, MS 251, MS 251 C Reassemble all other side of the guide and the protective...
Instruction Manual - Page 85
... it is flush with the edge of the air guide shroud.
: Push the short circuit wire (2) and ground wire (3) into the guides (arrows).
- Install the carburetor, b 12.5
84
MS 231, MS 231 C, MS 251, MS 251 C Install the carburetor carrier, b 12.8
2310RA328 TG
2
- Install filter base with wiring harness, b 12.3
- Reassemble all other parts in
position and pull the grommet of
2
3
fuel hose...
Instruction Manual - Page 94
... hook engages the lever on the choke shaft (arrows).
: Push the lever (1) onto the throttle shaft (2) so that it engages the flats on the carburetor: H = high speed screw (1) L = low speed screw (2) LA = idle speed screw (3)
If the carburetor cannot be adjusted properly, the problem may be the adjusting screws. MS 231, MS 231 C, MS 251, MS 251 C
93 Remove the carburetor, b 12.5
-
Instruction Manual - Page 96
... engages.
Check chain tension and adjust if necessary.
-
As soon as a maximum engine speed of clarity the adjusting screws are installed, the adjusting screws fitted and the new limiter cap preinstalled.
-
12.7 Adjusting the Carburetor 12.7.1 Basic Setting
The basic setting is necessary only if the high speed screw (H) or low speed screw (L) has to be replaced or after removing...
Instruction Manual - Page 101
...STIHL press fluid,
b 14
2 - Always install a new tank vent.
100
MS 231, MS 231 C, MS 251, MS 251 C pressurize the fuel tank.
: Press the tank housing (1) downwards and use wooden block (2) 1108 893 4800 to the nipple (arrow) - If the pressure drops, the leak must be located and the faulty part replaced... remains constant for leverage.
Pressure test
2
- Coat sealing ring of...
Instruction Manual - Page 108
... the fuel pump (1) into the air guide shroud (2) until the tabs engage.
312
2310RA408 TG
2310RA406 TG
6 45
: Squeeze the tabs (arrows) together and pull out the manual fuel pump (1).
- - Install the carburetor, b 12.5
12.11.4 Manual Fuel Pump
Installing
- Check operation - MS 231, MS 231 C, MS 251, MS 251 C
107 Check the oil fuel pump and replace if necessary.
: Push the fuel...
Instruction Manual - Page 111
... system
110
MS 231, MS 231 C, MS 251, MS 251 C Special Servicing Tools New Special Tools No.
Nipple -
tightening down tool
Part No. 5910 890 4000
Application Fitting electrical wires in guides
Rem. Description 1 Punch-down screws with electric or pneumatic screwdrivers; Existing Special Tools
No. Description
1 Carburetor and engine tester - 13. Testing engine and carburetor for...
Instruction Manual - Page 112
... 31 Setting disk
32 Hook
Part No....MS 231 C, MS 251, MS 251 C
111 Sleeve 23 Screwdriver 24 Screwdriver bit, T 27 x 150 25 Hook 26 Assembly stand 27 Puller
- Description
19 Flange 20 Torque wrench 21 Torque wrench 22 Installing tool 10
- Sealing exhaust port for leakage test 0.5 to 18 Nm 6 to 80 Nm Installing hookless snap rings in piston Sleeve for installing tool 10 Adjusting the carburetor...
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