Stihl MS 251 Support Question
Stihl MS 251 Support Question
Find answers below for this question about Stihl MS 251.Need a Stihl MS 251 manual? We have 1 online manual for this item!
Question posted by jamessampson64 on October 13th, 2022
Need Screw
I have been trying to find a screw supposedly on the bottom of the saw to adjust the oil flow where the hell is it because I see two screws that hold the handle on and that is it on the MS25
Current Answers
Answer #1: Posted by SonuKumar on October 13th, 2022 9:06 PM
SonuKumar
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Related Stihl MS 251 Manual Pages
Instruction Manual - Page 3
Servicing Aids
112
2
MS 231, MS 231 C, MS 251, MS 251 C Special Servicing Tools 110
14. Contents
12.6 Servicing
the Carburetor
90
12.6.1 Metering Diaphragm 90
12.6.2 Inlet Needle
90
12.6.3 Pump Diaphragm
91
12.6.4 Lever on
Throttle Shaft
92
12.6.5 Adjusting Screws
93
12.7 Adjusting
the Carburetor
95
12.7.1 Basic Setting
95
12.7.2 Standard setting
96
12.8 Carburetor Carrier...
Instruction Manual - Page 4
...screws must not be taken as shown in the "STIHL Special Tools" manual.
Technical information bulletins also supplement the parts list until a revised edition is clamped in the text and pictures for engineering changes which have several causes. The meanings are included in position. MS 231, MS 231 C, MS 251, MS 251... held in position with two screws (1) and washers.
Symbols are...
Instruction Manual - Page 5
...handling may result in burns or other source of heat near the fuel. replace as the safety precautions and warnings in line with fuel must be tightened to a specific torque or coated with the aid of engine damage due to overheating.
4
MS 231, MS 231 C, MS 251, MS 251...be maintained when tightening down screws, nuts and other fasteners ...of oils and fuels
Collect fuel or lubricating oil in ...
Instruction Manual - Page 7
... / engine housing
2.0
M 12x1 L Carrier / crankshaft
50.0
P 6x28
Engine housing / bearing plug
6.0
D 4x16
Oil pump
4.0
M 5x16
Muffler / cylinder
10.0
M 8x1
Flywheel / crankshaft
28.0
P 4x10
Retainer
1.0
Q B
2), 3) 2)
1), 3) 1), 3)
1), 3) 2), 3) 4)
6
MS 231, MS 231 C, MS 251, MS 251 C
These screws form a permanent thread when they are used in polymer and light metal...
Instruction Manual - Page 8
... properly in the hole and rotate it counterclockwise until it drops down slightly. MS 231, MS 231 C, MS 251, MS 251 C
7
Fastener
Thread size For component
Torque Nm
Remarks
Screw Screw
Screw Screw
P 4x12 P 4x10 M 10x1 D 4x20 D 5.3x41
Pre-separator / engine housing Elbow connector / air guide shroud Spark plug / cylinder Ignition module/cylinder Cylinder / engine housing
2.0 1.6 12...
Instruction Manual - Page 9
... idle speed screw LA
Replace the clutch springs or install new clutch
Replace the clutch springs
Loud noises
Clutch springs stretched Needle cage damaged Clutch shoe retainer broken Clutch shoes and carrier worn
Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch
8
MS 231, MS 231 C, MS 251, MS 251 C 3.
Instruction Manual - Page 10
... speed screw LA
Replace the clutch springs or install new clutch
Replace the clutch springs
Saw chain does not stop immediately when brake is activated
Brake spring stretched or broken Fit new brake spring
Brake band stretched or worn Clutch drum worn
Fit new brake band Install new clutch drum
MS 231, MS 231 C, MS 251, MS 251 C
9
Instruction Manual - Page 16
... -
foreign matter in accelerator Install new carburetor pump worn or damaged
MS 231, MS 231 C, MS 251, MS 251 C
15 Helical spring not located on nipple Remove the inlet control ...new metering diaphragm
Poor acceleration
Setting of low speed screw too lean Check basic carburetor setting, correct if necessary
Setting of high speed screw too lean
Check basic carburetor setting, correct if ...
Instruction Manual - Page 17
... the carburetor
Reset low speed screw (L) correctly Reset idle speed screw (LA) correctly
Replace tank vent
Saw chain rotates at idle speed
Leak...MS 231, MS 231 C, MS 251, MS 251 C Condition
Cause
Remedy
Engine will not idle, idle speed too Throttle shutter opened too wide by Reset idle speed screw (LA)
high
idle speed screw (LA)
correctly
Oil seals/engine pan leaking
Seal or replace oil...
Instruction Manual - Page 18
...tank to carburetor
Seal connections or install new fuel hose
Setting of high speed screw H too Check basic carburetor setting,
rich
correct if necessary
Main jet bores ...damaged or fatigued
Fit new pump diaphragm
Ignition timing wrong, flywheel out of adjustment - low power
Remedy
Clean air filter or replace if necessary
Throttle shutter... if necessary
MS 231, MS 231 C, MS 251, MS 251 C
17
Instruction Manual - Page 21
...devices on the rear handle -
arrows) and its seat (arrow).
- Chain Brake
5.1 Checking Operation
All models
The chain brake is one of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C Troubleshooting, b ... brake and the saw . The braking time is imperceptible to an abrupt stop .
: Take out the screws (1). : Remove the cover (2).
219RA049 TG
Machines with chain oil, chips, fine ...
Instruction Manual - Page 22
...the machine and tighten it to disconnect the brake spring (1) from the brake lever.
2310RA015 TG
MS 231, MS 231 C, MS 251, MS 251 C
21 Remove the fan housing, b 8.2
1
- Engage the chain brake. The brake spring... Lever - Disengage the chain brake
: Hold the brake band (1) sideways, attach it down the screws (2) firmly.
2310RA014 TG
1
TOP
- Install the clutch drum, b 4.1
2
OP
1
-
Instruction Manual - Page 28
...a little and disconnect it in the
reverse sequence.
: Take out the screw (1).
5.4.2 Brake cable Removing and Installing
: Remove the retainer (2) with brake cable.
- Turn adjusting screw clockwise
to stretch the hose.
2310RA044 TG
2310RA057 TG
- Check the brake cable (1) and retainer (2), replace if necessary
MS 231, MS 231 C, MS 251, MS 251 C
27 Turn adjusting screw counter-
Instruction Manual - Page 29
...remove it from the retainer (4).
: Fit the adjusting screw (1) and wind it home until the gap between the screw's hexagon and the retainer is 2 mm.
: Fit the clamp screw (2) and tighten it down firmly.
1
: Pry....
1
2
: Push the insert (1) with the housing ribs.
28
MS 231, MS 231 C, MS 251, MS 251 C The insert must be flush with brake cable (2) into its seat (arrow) as far as stop. -
Instruction Manual - Page 30
....3
MS 231, MS 231 C, MS 251, MS 251 C
29 Check position of fuel hose and correct if necessary, b 12.11.2
- Install the switch lever, b 10.3.1
- 1
2
1
2
- if this is pushed fully into its seat (arrow).
: Insert and tighten down the screw (2) firmly.
2310RA059 TG
When lifting the tank housing make sure the grommet (1) is not the case, the adjustment...
Instruction Manual - Page 31
..., MS 231 C, MS 251, MS 251 C Reassemble in the reverse sequence.
- Swing the wing nut (1) upright.
: Push the wing nut (1), thin side first (see arrow), into position.
1
2
1
The chain catcher (arrow) is installed in the reverse sequence.
1
: Position the replacement chain catcher (1) so that it snaps into the opening and press it down the screw (2) firmly...
Instruction Manual - Page 32
...housing is no longer guaranteed. Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C
31 the security of the collar
stud (1) with
threadlocking adhesive, fit and...stud to the specified torque - Coat the collar stud with threadlocking adhesive, b 14
-
Screw home the collar stud and tighten it engages the existing thread.
- Remove the standard collar...
Instruction Manual - Page 33
..., air filter and ignition system before looking for faults on the cylinder.
32
MS 231, MS 231 C, MS 251, MS 251 C Cover the exhaust port.
Remove the exhaust gasket - Remove and install the...Always replace components with damaged sealing faces.
2
2310RA068 TG
2310RA070 TG
11
: Take out the screws (1).
: Remove the muffler (2), check and replace if necessary.
- take care not to push...
Instruction Manual - Page 34
... to top dead center. This makes adjustment of leaks. The engine can be...screws (2) - Remove the carburetor, b 12.5
- do not tighten down firmly.
- This can be modified as shown.
Remove the shroud, b 6.4
c
1
1
b
- 2310RA072 TG 2310RA074 TG
6.2 Leakage Test
Defective oil seals and gaskets or cracks in place.
2310RA079 TG
a
2710RA164 TG 2310RA073 TG
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 37
...36
MS 231, MS 231 C, MS 251, MS 251 C Pull out the oil ...oil pump, b 11.3
- Take care not to install the oil seal (2). Remove the shroud (1).
2310RA086 TG
: Apply puller (1) 5910 890 4400. -
Clamp the puller arms. -
Remove the clutch, b 4
- Lubricate sealing lips of new oil seal with a suitable tube or a punch.
- Remove the installing sleeve (1).
1
2
: Take out the screws...
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