Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Answer #1: Posted by SonuKumar on July 16th, 2022 9:27 AM
SonuKumar
Member since:
May 9th, 2021 Points: 16,622,390
Member since:
May 9th, 2021 Points: 16,622,390
https://www.youtube.com/watch?v=CAWzq2GtBdg
How much oil do you put in a STIHL chainsaw?
2.5 gallons of gasoline + 6.4 fluid ounces of oil.
Does a STIHL chainsaw need oil?
Stihl gasoline-engine chain saws are powered by two-cycle engines that run on a mixture of gasoline and lubricating oil. The gas and oil must be mixed in the correct proportions or engine performance will suffer.
Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.
Regards,
Sonu
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Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...
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. Chain Lubrication 78
11.1 Pickup Body
78
11.2 Oil Suction Hose
78
11.3 Oil Pump
78
11.4 Valve
80
12. Models with
QuickStop Super
24
5.4.1 Adjusting
the brake cable
26...
Instruction Manual - Page 5
..., b 14. Storing and disposing of oils and fuels
Collect fuel or lubricating oil in a clean container and dispose of ... Check disassembled parts for servicing
Remove the chain sprocket cover, saw chain and guide bar before re-installing - ... the tightness of engine damage due to overheating.
4
MS 231, MS 231 C, MS 251, MS 251 C
Run the machine only with threadlocking adhesive.
Always ...
Instruction Manual - Page 6
...2.2 Fuel System
2.3 Ignition System 2.4 Chain Lubrication
MS 231
40.6 cm3 41.5 mm 30.0 mm 2.0 kW (2.7 bhp) at 9,500 rpm
13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm
0.5 bar 0.5 bar
MS 251
45.6 cm3 44.0 mm 30.0...05/- 0.10) mm NGK CMR 6 H 0.5 mm
Speed-controlled Ematic oil pump
Oil delivery rate:
8.0 (+/3.0) cm3/min at 10,000 rpm
MS 231, MS 231 C, MS 251, MS 251 C
5 2.
Instruction Manual - Page 7
... Screw Screw 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 ...
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
Instruction Manual - Page 8
...binding head 2) Micro-encapsulated screws 3) Waxed screws 4) Degrease crankshaft/flywheel and mount oil-free Q) QuickStop Super B) Quick chain adjuster
Use the following procedure when refitting a DG or P screw in an ... up screws with medium strength Loctite 242 or 243 before reinstalling. MS 231, MS 231 C, MS 251, MS 251 C
7
Power screwdriver setting for polymer: DG and P screws ...
Instruction Manual - Page 9
... load
Cause Clutch shoes badly worn Clutch drum badly worn
Remedy Install new clutch Install new clutch drum
Saw chain rotates at idle speed
Engine idle speed too high Clutch springs stretched
Clutch springs broken
Readjust idle speed screw ...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
... new clutch drum
Check freedom of movement and operation of brake band
Saw chain rotates at idle speed
Engine idle speed too high Clutch springs stretched
Clutch ...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...
Instruction Manual - Page 12
... worm
Oil pump damaged or worn
Install new oil pump
Machine losing chain oil
Oil pump damaged or worn
Oil suction hose connection damaged
Engine housing cracked
Install new oil pump Install new oil intake hose Install new engine housing
Oil pump delivers insufficient oil
Oil pump damaged or worn Worm driver is loose
Install new oil pump Install new worm
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 14
...
Cause
Remedy
Starter mechanism is very dirty
Thoroughly clean complete starter mechanism
At very low outside temperatures: Lubricating oil on rewind spring becomes viscous (spring windings stick together) or moisture has got onto the rewind spring (spring...halogenated hydrocarbons), then pull rope carefully several times until normal action is restored
MS 231, MS 231 C, MS 251, MS 251 C
13
Instruction Manual - Page 15
...oil
Incorrect air gap between ignition Set air gap correctly module and flywheel
Flywheel cracked or damaged or pole shoes have turned blue
Install new flywheel
Ignition timing wrong, flywheel out of the spark plug, clean or replace spark plug if necessary.
14
MS 231, MS 231 C, MS 251, MS 251... if necessary
Spark plug sooted, smeared with oil Clean the spark plug or replace if necessary...
Instruction Manual - Page 17
... (L) correctly Reset idle speed screw (LA) correctly
Replace tank vent
Saw chain rotates at idle speed
Leak on fuel hose from tank to carburetor
Seal ...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 19
... throttle
Engine pan leaking or damaged (cracks)
Intake manifold damaged / bore blocked
Remedy Replace the oil seals
Inspect engine pan, re-seal or replace if necessary.
3.7 Engine
Always check and, if necessary, repair the following parts before looking for faults on fan housing
18
MS 231, MS 231 C, MS 251, MS 251 C Air filter - Clean bore or install...
Instruction Manual - Page 21
...chain brake.
Chain Brake
5.1 Checking Operation
All models
The chain brake is measured in order if deceleration of outside diameter -
If the chain brake does not operate properly, refer to one of the machine.
20
MS 231, MS 231 C, MS 251, MS 251...screws (1). : Remove the cover (2).
219RA049 TG
Machines with chain oil, chips, fine particles of abrasion, etc.) and smoothing of ...
Instruction Manual - Page 22
... TG
1 The clutch drum must rotate freely
when the chain brake is now relaxed. : Use the assembly tool
1117...chain brake. Troubleshooting, b 3.2
- Remove the brake spring from the anchor pin (arrow). - Carry out the other parts in the direction of 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...
Instruction Manual - Page 25
...b 14
1
1
: Disconnect the spring (1) from
the brake lever.
2
2310RA034 TG
Installing - Troubleshooting, b 3.2 - TOP
2310RA031 TG
- Engage the chain brake. Remove the brake spring (1) from the anchor pin (arrow).
: Disconnect the brake cable (1).
- Remove the brake band, b 5.2
1
1
TOP... its seat (arrow) as far as stop.
2310RA020 TG
24
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 27
... the spring (1) to the brake lever (arrow).
26
MS 231, MS 231 C, MS 251, MS 251 C Press down the lockout lever (1) and hold it ...in the relaxed condition. Reassemble all other parts in the reverse sequence.
1
2310RA028 TG
a
0001RA456 TG
5.4.1 Adjusting the brake cable
The turns of the brake cable.
- Remove the chain...
Instruction Manual - Page 30
...housing and secure it into the adjusting screw (2) - Check operation and adjust the brake cable, b 5.4.1
2310RA060 TG
2710RA079 TG
5.5 Chain Tensioner
2310RA066 TG
: Attach the brake cable (1) to the bore (arrow) in the brake lever (2).
2
1
: Slide the...of the brake cable will vary.
- Install the throttle trigger, b 10.3
MS 231, MS 231 C, MS 251, MS 251 C
29 Troubleshooting, b 3.2
2 3
-
Instruction Manual - Page 31
...
- Reassemble in the reverse sequence.
- Check the wing nut (1) and replace if necessary
30
MS 231, MS 231 C, MS 251, MS 251 C Lubricate thread and gears with the contour of the recess (arrows).
: Insert and tighten down until it snaps into position.
1
2
1
The chain catcher (arrow) is installed in the reverse sequence.
- Reassemble in the reverse sequence...
Instruction Manual - Page 32
...no longer guaranteed. In such a case use the collar stud in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C
31 Screw home the collar stud and tighten it engages the existing thread.
-... the collar
stud (1) with
threadlocking adhesive, fit and tighten down firmly.
-
Remove the chain sprocket
cover.
2
1
Repair solution
If the thread in the reverse sequence.
: Coat the...
Instruction Manual - Page 79
... band, b 5.2
- 11. Chain Lubrication
11.1 Pickup Body
11.2 Oil Suction Hose
Impurities gradually clog the fine pores of the filter with minute particles of the tab (arrow) must locate against the housing.
- Remove the oil pump, b 11.3
- Push the oil suction hose (1), pickup body first, through the housing bore (arrow).
78
MS 231, MS 231 C, MS 251, MS 251 C Troubleshooting...
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