Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Question posted by Jeffreyridd on January 27th, 2017
Stihl Ms251 Bar Oil
Bar oil flow seems excessive.Is there an adjustment screw to regulate the flow,and if so where is it
Current Answers
Answer #1: Posted by BusterDoogen on January 27th, 2017 9:21 AM
BusterDoogen
Member since:
October 30th, 2011 Points: 28,565,397
Member since:
October 30th, 2011 Points: 28,565,397
There's no chain oil adjustment according to the manual.
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Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...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.
Specifications
5
2.1 Engine
5
2.2 Fuel System
5
2.3 Ignition...
Instruction Manual - Page 3
...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...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
12.11.5 Tank Housing...
Instruction Manual - Page 4
...is clamped in position with two screws (1) and washers. The screws must not be taken as shown in this power tool. Engage the bar mounting stud in the outer bore ...3
2
Servicing and repairs are intended exclusively for all special servicing tools currently available from STIHL. MS 231, MS 231 C, MS 251, MS 251 C
3 To help locate the fault, consult the chapter on the machine, may have been...
Instruction Manual - Page 5
..., MS 231 C, MS 251, MS 251 C hose barb connectors
Pull off or push on the ignition system.
Always use sharp-edged pliers, screwdrivers, etc. All work on fuel hoses in the instruction manual. Fuel system -
Run the machine only with the connector, preferably by the STIHL part number, the { logo and the STIHL parts symbol K This symbol...
Instruction Manual - Page 6
... at gauge pressure:
Operation of tank vent at gauge pressure:
Fuel:
0.8 bar
0.5 bar as specified in instruction manual
Air gap between ignition module and fanwheel: Spark plug (resistor type): Electrode gap:
0.30 (+ 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
...
Bearing plug / cylinder
8.0
P 5x18
Fan housing / engine housing
4.0
P 4x12
Air baffle / 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
Instruction Manual - Page 12
... 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 C
11 rectify...
Instruction Manual - Page 28
...
2
- clockwise to stretch the hose.
2310RA044 TG
2310RA057 TG
- Remove the carburetor, b 12.5
-
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- Loosen and lower the tank
TOP
housing, b 12.11.2
1
- The brake band (1) must locate snugly against engine housing (arrows) and the clutch drum...
Instruction Manual - Page 29
..., through the bore (arrow) in the engine housing.
1
2
: Push the insert (1) with the housing ribs.
28
MS 231, MS 231 C, MS 251, MS 251 C Disassembling the brake cable and retainer
2 1
21
2310RA064 TG
2310RA056 TG
2310RA054 TG
3
4
: Loosen the clamp screw (1) and take out the adjusting screw (2).
: Turn the hook (3) so that its seat (arrow) as far as stop . -
Instruction Manual - Page 30
... if necessary, b 12.11.2
- Lift the tank housing and secure it into the adjusting screw (2) - Reassemble all other parts in the guide (arrow).
- Troubleshooting, b 3.2
2 3
- Check position of the brake cable will vary.
- Install the throttle trigger, b 10.3
MS 231, MS 231 C, MS 251, MS 251 C
29 1
2
1
2
- Install the switch lever, b 10.3.1
- Check position of fuel return...
Instruction Manual - Page 35
..., MS 231 C, MS 251, MS 251 C Install the muffler, b 6.1
- take care not to damage the plugs.
- To find the leak, coat the suspect area with pressure test, b 6.2.3
6.2.3 Pressure Test
Carry out the same preparations as for at least 20 seconds, the engine is no more than 0.3 bar within 20 seconds, it over the studs
: Fit the...
Instruction Manual - Page 59
...MS 231 C, MS 251, MS 251 C Examine the fan housing and segment and replace if necessary.
2310RA202 TG
2310RA201 TG
- This has a detrimental effect on the other parts in order but plugged with sleeve and screws...Before installing, lubricate the rewind spring and starter post with STIHL special lubricant, b 14.
: Take out the screw (1) with dirt. Relieve tension of the starter rope becomes...
Instruction Manual - Page 94
... to be the adjusting screws. Screw down the low speed screw (L) as far as stop.
- Low speed screw
1
1 : Rotate the limiter cap until the
lug (1) is in the reverse sequence.
1
2
3
There are three adjusting screws on the end of the shaft.
: Fit the retaining ring (3).
: Check operation - lever (1) must engage lever (4) (arrows).
-
MS 231, MS 231 C, MS 251, MS 251 C
93 Reassemble all...
Instruction Manual - Page 96
...
8
4
6
2310RA283 TG
If this speed is the basic setting.
2. MS 231, MS 231 C, MS 251, MS 251 C
95
The setting disc 5910 893 6600 may be fitted on the high speed screw H. This speed cannot be replaced or after removing the limiter cap. Adjust engine speed with the high speed screw H (1) against its seat, open ). Check chain tension and...
Instruction Manual - Page 97
...slowly clockwise as far as a result of lack of lubrication and overheating.
96
MS 231, MS 231 C, MS 251, MS 251 C Warm up the engine.
-
Adjustment for the standard setting.
Adjusting engine idle speed
-
Turn low speed screw (L) counterclockwise until the chain stops running behavior. Even minor adjustments can noticeably affect engine running , then turn it back 1 full turn...
Instruction Manual - Page 101
...MS 231, MS 231 C, MS 251, MS 251 C If the pressure drops, the leak must be located and the faulty part replaced.
- Coat sealing ring of 0.5 bar. Operate the pump until the pressure gauge indicates a pressure of new tank
1
vent with STIHL...Pressure test
2
- Reassemble in
alignment.
2310RA368 TG
1
: Take out the screw (1).
2310RA365 TG
: Pry the tank vent (1) out of its seat using the...
Instruction Manual - Page 103
.... All models
- Lower the tank housing.
1
1
2310RA379 TG
2310RA375 TG
: Ease the handlebar (1) sideways and take it out of the adjusting screw - Remove the pickup body, b 12.11.1
102
MS 231, MS 231 C, MS 251, MS 251 C
Installing
1
1
1
2310RA057 TG
2310RA380 TG
2310RA377 TG
When the tank housing is lowered, the brake cable grommet is pulled out of...
Instruction Manual - Page 106
... pull the retainer (2) out of the adjusting screw - Lower the tank housing, b 12.11.2
: Remove the fuel hose (1),
b 12.11.2.
1
2310RA394 TG
2310RA391 TG
1 : Pry out the grommet (1).
- 12.11.3 Fuel Hoses - Manual Fuel Pump
- Open the tank cap. Remove the carburetor, b 12.5
- MS 231, MS 231 C, MS 251, MS 251 C
105 Remove the air guide shroud, b 12...
Instruction Manual - Page 112
... tool 10 Adjusting the 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. Sleeve 23 Screwdriver 24 Screwdriver bit, T 27 x 150 25 Hook 26 Assembly stand 27 Puller
- No. MS 231, MS 231 C, MS 251, MS 251 C
111 Description...
Instruction Manual - Page 113
... 830 2000
Application
Oil seals, sliding and bearing points Bearing bore in rope rotor, rewind spring in fan housing Rubber components, AV buffers Sealing engine pan / cylinder
6 Standard commercial solventbased degreasant containing no chlorinated or halogenated hydrocarbons
Cleaning sealing faces and carburetor, crankshaft stubs and flywheel taper
112
MS 231, MS 231 C, MS 251, MS 251 C 14...
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