Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Question posted by jboutfishn on September 20th, 2022
Chain/bar Oil Adjustment
Is the amount of oil that lubricates the chain/bar on the MS 251 Easy Start adjustable? If so, where and how?
Current Answers
Answer #1: Posted by SonuKumar on September 20th, 2022 8:55 PM
SonuKumar
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Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...
8
3.2 Chain Drive,
Chain Brake,
Chain Tensioner
9
3.3 Chain Lubrication
11
3.4 Rewind Starter
12
3.5 Ignition System
14
3.6 Carburetor
15
3.7 Engine
18
4.
Models with
QuickStop Super
24
5.4.1 Adjusting
the brake cable
26
5.4.2 Brake cable
Removing
and Installing
27
5.5 Chain Tensioner
29
5.5.1 Quick Chain
Tensioner
30
5.5.2 Chain Catcher
30
5.6 Bar Mounting...
Instruction Manual - Page 5
... or mounting the machine to overheating.
4
MS 231, MS 231 C, MS 251, MS 251 C Gasoline is an extremely flammable fuel and... tool. Storing and disposing of oils and fuels
Collect fuel or lubricating oil in this service manual. Do not...hoses - Preparations for servicing
Remove the chain sprocket cover, saw chain and guide bar before re-installing - Always use sharp-...started up in position -
Instruction Manual - Page 6
... engages at: Crankcase leakage test at gauge pressure: under vacuum:
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 mm 2.2 kW (3.0 bhp) at 9,500 rpm
13,000...
Instruction Manual - Page 7
...2.5 Tightening Torques
DG and P (Plastoform) screws are installed for bar / engine housing
16.0
(repair solution)
P 5x18
Cover, chain brake / engine housing
4.0
M 5
Filter base / baffle ...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
...Remarks:
1) Screws with 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 existing thread:
Place the screw in... or 243 before reinstalling. MS 231, MS 231 C, MS 251, MS 251 C
7 Tighten the screw clockwise to the specified torque.
Instruction Manual - Page 12
...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 C
11
3.3 Chain Lubrication
In...
Instruction Manual - Page 15
... fuel and 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 C Check operation of adjustment - key...
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 21
... (2).
219RA049 TG
Machines with chain oil, chips, fine particles of abrasion, etc.) and smoothing of the friction surfaces of the brake band and clutch drum impair the coefficient of the lockout lever on inside diameter and/or parts of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C Engage the chain brake. the chain must come
areas on...
Instruction Manual - Page 27
... (arrow).
26
MS 231, MS 231 C, MS 251, MS 251 C Release the lockout lever.
- If this is the distance the lockout lever (1) can be the adjustment of the coasting brake.
- Reassemble all other parts in the relaxed condition. Troubleshooting, b 3.2
- Free travel .
- Adjust the brake cable, b 5.4.1
- A certain amount of the brake spring must rotate freely.
-
Lubricate the brake...
Instruction Manual - Page 30
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) ..., the adjustment of the brake cable will vary.
- Install the switch lever, b 10.3.1
- Troubleshooting, b 3.2
2 3
- if this is pushed fully into the adjusting screw (2) - Install the throttle trigger, b 10.3
MS 231, MS 231 C, MS 251, MS 251 C
29...
Instruction Manual - Page 31
Lubricate thread and gears with the contour of the recess (arrows).
: Insert and tighten down until it lines up with
STIHL multipurpose grease, b 14
-
Check the wing nut (1) and replace if necessary
30
MS 231, MS 231 C, MS 251, MS 251 C When installing the adjusting wheel, make sure its teeth face the cover plate.
- Reassemble in the reverse sequence...
Instruction Manual - Page 32
... C, MS 251, MS 251 C
31 Remove the chain sprocket
cover.
2
1
Repair solution
If the thread in the screw list as a repair solution, b 2.5.
1
2310RA046 TG 2310RA047 TG
: Push stud puller 5910 893 0501 (1) over the collar stud (2) as far as it will go and unscrew the stud counterclockwise.
- Reassemble all other parts in the reverse sequence. 5.6 Bar...
Instruction Manual - Page 34
... 12.5
- Set the piston to enter the engine and upset the fuel-air mixture. This makes adjustment of leaks. Moreover, the transition from idle speed to part or full throttle is in castings are the... the spark plug.
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 C
33
Instruction Manual - Page 35
...stroke because there is airtight.
34
MS 231, MS 231 C, MS 251, MS 251 C Install the muffler, b 6.1
- pressure test.
: Operate the lever (2) until the pressure gauge (4) indicates a vacuum of 0.5 bar. vacuum test.
: Operate the ...pump 0000 850 1300 to rise (reduced vacuum in the engine), the oil seals must be assumed that the oil seals are in the reverse sequence.
4
3
1
2
: Connect ...
Instruction Manual - Page 79
...- Remove the oil pump, b 11.3
- Open the oil tank cap and drain the oil tank b 1.
- 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 Check position of the tab (arrow) must locate against the housing.
- Remove the clutch, b 4 - 11. Chain Lubrication
11.1 Pickup Body
11.2 Oil Suction Hose
Impurities gradually...
Instruction Manual - Page 96
...opening (arrow) and then push home the limiter cap until it engages.
MS 231, MS 231 C, MS 251, MS 251 C
95
Check chain tension and adjust if necessary.
- Warm up the engine. The setting disc 5910 893 6600... the risk of 13,000 rpm is higher than 3,700 rpm, abort the procedure and start again with the low speed screw L (2) against its seat, open ). push the screwdriver...
Instruction Manual - Page 97
... out standard setting.
- Turn the idle speed screw (LA) clockwise until the chain starts running behavior. Warm up the engine.
- It is idling
- no further than... 6.1
2310RA285 TG
-
Adjusting engine idle speed
-
The setting of lubrication and overheating.
96
MS 231, MS 231 C, MS 251, MS 251 C Check chain tension and adjust if necessary.
- Saw chain runs while engine is usually...
Instruction Manual - Page 111
... piston pin
Adjusting air gap between the ignition module and flywheel
Installing rewind spring
Attaching springs
Leakage Test
Protecting the oil seal (clutch side)
Installing oil seal (clutch side/ignition side)
Spark plug
1)
Protecting the oil seal (ignition side)
Clamping machine to assembly stand
Testing ignition system Testing ignition system
110
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 112
... carburetor IS-P screws Detaching springs on for screwdriver (adjusting carburetor) Removing pickup body
Remarks: 1) Use for repairs Removing oil seals Removing oil seals Removing oil seals Pull off the limiter cap. Removing bar mounting studs Removing flywheel Add-on clutch shoes Holding saw for releasing only.
MS 231, MS 231 C, MS 251, MS 251 C
111 Jaws (No. 6) 28 Puller 29 Stud...
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