Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Current Answers
Answer #1: Posted by waelsaidani1 on March 26th, 2016 11:03 AM
waelsaidani1
Member since:
May 12th, 2013 Points: 19,501,777
Member since:
May 12th, 2013 Points: 19,501,777
Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...Ignition Lead
48
7.6 Flywheel
49
7.7 Short Circuit Wire
50
7.7.1 Testing
50
7.7.2 Removing and
Installing
50
7.7.3 Ground Wire
53
7.7.4 Contact Spring
53
7.8 Ignition System
Troubleshooting
... Test
89
RA_737_00_01_01
MS 231, MS 231 C, MS 251, MS 251 C
q
© ANDREAS STIHL AG & Co. Troubleshooting
8
3.1 Clutch
8
3.2 Chain Drive,
Chain Brake,
Chain Tensioner
9
3.3 Chain ...
Instruction Manual - Page 3
...
98
12.10 Tank Vent
99
12.10.1 Testing
99
12.10.2 Removing and
Installing
100
12.11 Fuel Intake
101
12.11.1 Pickup Body
101
12.11.2 Fuel Hose
101
12.11.3 Fuel Hoses - Servicing Aids
112
2
MS 231, MS 231 C, MS 251, MS 251 C Manual Fuel Pump 105
12.11.4 Manual Fuel Pump 107
12...
Instruction Manual - Page 5
... in damage to the fuel hoses.
Check disassembled parts for servicing
Remove the chain sprocket cover, saw chain and guide bar before re-installing...removal.
Always install new hoses - Other press fluids are heated for assembly or disassembly.
Improper handling may result in burns or other source of engine damage due to overheating.
4
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 7
... Screw Screw Screw Screw Carrier Screw Screw Screw Nut Screw
P 4x12
Chain tensioner cover
1.5
P 5x18
Antivibration element / engine housing
4.0
P 5x34
Antivibration...polymer and light metal components. They can be removed and installed as often as necessary without impairing the...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
Instruction Manual - Page 10
... Chain sprocket wears rapidly
Cause Chain not properly tensioned Wrong chain pitch Insufficient chain lubrication
Remedy Tension chain as specified Fit chain of correct pitch Check chain lubrication
Saw chain stops under full load
Clutch shoes ...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 13
... enough
Check rewind spring and reduce tension
Starter rope can be pulled out almost without resistance (crankshaft does not turn)
...Models with ErgoStart
Guide peg on pawl or pawl itself is difficult to carrier
Spring in spring housing fatigued Install new spring housing
12
MS 231, MS 231 C, MS 251, MS 251 C 3.4 Rewind Starter
Condition Starter rope...
Instruction Manual - Page 16
... 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 lever and
of inlet control lever
refit...the inlet needle
Inlet control lever sticking on fuel hose from tank to valve seat Remove inlet needle, clean and refit
Diaphragm gasket leaking
Fit new diaphragm gasket
Metering diaphragm...
Instruction Manual - Page 20
... flat side of wear. as shown in the reverse sequence.
2310RA005 TG
2310RA003 TG
- MS 231, MS 231 C, MS 251, MS 251 C
19 4. Inspect the clutch drum (1) for signs of its metal top faces the piston and then push it down firmly - Remove the locking strip from the cylinder.
- If there are signs of serious wear on...
Instruction Manual - Page 21
... particles of abrasion, etc.) and smoothing of the friction surfaces of the brake band and clutch drum impair the coefficient of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C Remove the brake band without overstretching it from the underside of friction, which prolongs the braking time. With the chain brake released, open the
throttle...
Instruction Manual - Page 22
Installing
- Reassemble all other checks, b 5.1
- Remove the shroud, b 6.4
- Carry out the other parts in position.
:...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
- Install the clutch drum, b 4.1
2
OP
1
- Engage the chain brake. Remove the brake spring from the anchor pin (arrow). - ...
Instruction Manual - Page 31
...chain catcher (arrow) is installed in the sprocket cover.
1
2
: Take out the screw (arrow).
: Remove the cover plate (1) and adjusting wheel (2). 22
4
1
5.5.2 Chain Catcher
- Swing the wing nut (1) ...5.5.1 Quick Chain Tensioner
The quick chain tensioner is an integral part of the sprocket cover.
- Check the wing nut (1) and replace if necessary
30
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 59
... has a detrimental effect on the function of rewind spring, b 8.4
- Lift the hand guard a little and remove the fan housing.
1
2310RA201 TG
1
: Engage the segment (1) in the slots (arrows) in the reverse sequence.
58
MS 231, MS 231 C, MS 251, MS 251 C Relieve tension of the starter mechanism.
- Reassemble all components.
2
2
: Apply a punch to the holes on the rewind...
Instruction Manual - Page 60
... as for the
standard version.
2310RA206 TG
-
Remove the fan housing, b 8.2
- Lubricate the seats of rewind spring, b 8.5
-
MS 231, MS 231 C, MS 251, MS 251 C
59 Remove the ErgoStart, b 8.4
1
Two pawls are ...loop must be in models with the pawl (arrow). the pawl moves outwards.
- Relieve tension of the new pawls, b 14
: Position the spring clip (1) so that its loop...
Instruction Manual - Page 61
...move towards the center of the rewind spring.
2310RA211 TG
2310RA210 TG
1
: Remove the E-clips (arrows). : Pull off the spring housing (4).
1
2310RA209 TG
... - Reassemble all other parts in the reverse sequence.
60
MS 231, MS 231 C, MS 251, MS 251 C 8.4 ErgoStart
Installing
Check operation
The spring may still be under
tension and must always be held against the ribs (arrow).
1...
Instruction Manual - Page 62
...cover washer. Check the rope rotor and replace if necessary.
- Install the starter rope, b 8.6
- MS 231, MS 231 C, MS 251, MS 251 C
61 Remove the ErgoStart, b 8.4
All models
1
2
: Pull out the starter rope (1) about 5 cm ...will not be under tension if the starter rope is broken. - 8.5 Rope Rotor
Relieving tension of rewind spring
The system will not be under tension if either the starter...
Instruction Manual - Page 63
... clockwise. 1 1
2310RA218 TG
4903RA132 TG
2310RA215 TG
: Push the end of the rope rotor.
- Tension the rewind spring, b 8.7
- Hold the rope rotor steady since it will otherwise spin back and may damage the rewind spring.
62
MS 231, MS 231 C, MS 251, MS 251 C Remove the fan housing and the segment, b 8.2
2
1
2310RA219 TG
2310RA217 TG
: Thread the rope...
Instruction Manual - Page 64
...of STIHL special lubricant before maximum spring tension is otherwise a risk of the fan housing. Remove any remaining pieces of rewind spring if necessary and remove the rope rotor, b 8.5
- ...tensioned, install a new spring.
: Starting at the anchor loop, apply suitable tool to the recesses (arrows) and push the rewind spring into its seat in the fan housing - MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 77
...Check that the wires are not under tension.
2310RA195 TG
2
: Pry the filter base (1) out of the guides (arrows).
- Remove the choke rod, b 10.3.3
- Remove the air filter, b 12.1
...from the lever (3).
-
Remove the baffle, b 12.2
1
2
1
2310RA196 TG
: Pull the short circuit wire (1) and ground wire (2) out of the buffer (2).
76
MS 231, MS 231 C, MS 251, MS 251 C Put the filter ...
Instruction Manual - Page 96
.... Use the high speed screw (H) to set engine speed to be replaced or after removing the limiter cap.
this is necessary only if the high speed screw (H) or low ...high speed screw H (1) against its seat, open it 1 1/2 turns counterclockwise - MS 231, MS 231 C, MS 251, MS 251 C
95
Check chain tension and adjust if necessary.
-
Adjust idle speed with step 1.
3. Making the mixture ...
Instruction Manual - Page 97
...not satisfactory when operating at high altitude
A minor correction may be removed for operation at high altitude.
- Turn low speed screw (L) ...as far as a result of lack of lubrication and overheating.
96
MS 231, MS 231 C, MS 251, MS 251 C
1
This completes the basic setting of the idle speed screw ... chain tension and adjust if necessary.
- Turn the high speed screw (H) clockwise...
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