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 Mcleanduchessst on July 20th, 2019
Burned Out 2 Chains Due To Lack Of Oil
My stihl 251 c be does not oil the chain enough I have burned out 2 chains .
Current Answers
Answer #1: Posted by Odin on July 20th, 2019 11:48 AM
Odin
Member since:
April 10th, 2010 Points: 41,236,630
Member since:
April 10th, 2010 Points: 41,236,630
See the manual pages starting at https://www.manualslib.com/manual/1140903/Stihl-Ms-251.html?page=36&term=lubricat&selected=3, and follow carefully those instructions. If the issue persists or if you require further advice, you'll have to consult Stihl: use the contact information at https://www.contacthelp.com/stihl/customer-service.
Hope this is useful. Please don't forget to click the Accept This Answer button if you do accept it. My aim is to provide reliable helpful answers, not just a lot of them. See https://www.helpowl.com/profile/Odin.
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.
Clutch
19
4.1 Clutch Drum
19...
Instruction Manual - Page 5
...STIHL part number, the { logo and the STIHL parts symbol K This symbol may appear alone on to overheating.
4
MS 231, MS 231 C, MS 251, MS 251... and disposing of oils and fuels
Collect fuel or lubricating oil in a clean container... Preparations for servicing
Remove the chain sprocket cover, saw chain and guide bar before re...parts.
there is started up in burns or other source of the fuel ...
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
... 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 Fastener
Thread size For component
Torque Nm
Remarks
Screw Screw Screw Screw Screw...
Instruction Manual - Page 8
...1), 3)
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 the... screws.
Tighten the screw clockwise to the specified torque.
MS 231, MS 231 C, MS 251, MS 251 C
7
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 ... 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
...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 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
...If sooting keeps recurring, check air filter
Fuel/oil mixture - too much oil
Use correct mixture of fuel and oil
Incorrect air gap between ignition Set air gap ...loose
Press boot firmly onto spark plug and fit new spring if necessary
Spark plug sooted, smeared with oil Clean the spark plug or replace if necessary. 3.5 Ignition System
Condition
Engine runs roughly, misfires, temporary...
Instruction Manual - Page 17
... screw (LA)
high
idle speed screw (LA)
correctly
Oil seals/engine pan leaking
Seal or replace oil seals/engine pan
Throttle shutter does not close
Install new carburetor... screw (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 connections ... springs
16
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 19
... engine pan, re-seal or replace if necessary. Ignition system
Condition
Cause
Engine does not start easily, stalls Oil seals in fan housing dirty
Clean air inlet on fan housing
18
MS 231, MS 231 C, MS 251, MS 251 C Engine overheating
Insufficient cylinder cooling. Air filter - Fuel system - Clean bore or install new manifold.
Air inlets in...
Instruction Manual - Page 21
... Remove the cover (2).
219RA049 TG
Machines with chain oil, chips, fine particles of abrasion, etc.) and...chain brake released, open the throttle wide and activate the brake manually -
The clutch drum must not rotate.
: Pry the brake band (2) out of its remaining thickness is less
2 than a second) is measured in order if deceleration of the machine.
20
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 22
Reassemble all other checks, b 5.1
- Installing
- Disengage the chain brake
: Hold the brake band (1) sideways, attach it to disconnect the brake spring (1) from the brake lever.
2310RA015 TG
MS 231, MS 231 C, MS 251, MS 251 C
21 Carry out the other parts in position.
: Push the brake band (1) over the guide lugs (arrows) and into its seat.
: Insert and...
Instruction Manual - Page 25
Troubleshooting, b 3.2 - TOP
2310RA031 TG
- Engage the chain brake. Lubricate the pivot pins, b 14
1
1
: Disconnect the spring (1) from the ...the brake lever (2) out of the flat spring (1) into its seat (arrow) as far as stop.
2310RA020 TG
24
MS 231, MS 231 C, MS 251, MS 251 C The brake spring is worn, install a new engine housing.
- Remove the brake spring (1) from
the brake lever...
Instruction Manual - Page 27
...
0001RA456 TG
5.4.1 Adjusting the brake cable
The turns of the coasting brake.
- Remove the chain brake cover, b 5.2
The brake cable must be tightly against engine housing (arrows) and the...released.
: Carefully press the lockout lever (1) to the brake lever (arrow).
26
MS 231, MS 231 C, MS 251, MS 251 C
A certain amount of free travel must rotate freely.
- Free travel is necessary...
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) to the bore (arrow) in... 3.2
2 3
- Lift the tank housing and secure it into the adjusting screw (2) - Install the throttle trigger, b 10.3
MS 231, MS 231 C, MS 251, MS 251 C
29 Check position of fuel hose and correct if necessary, b 12.11.2
-
Instruction Manual - Page 31
...chain catcher (arrow) is installed in the reverse sequence.
- Check the wing nut (1) and replace if necessary
30
MS 231, MS 231 C, MS 251, MS 251...Remove the cover plate (1) and adjusting wheel (2). Remove the chain sprocket cover.
165RA007 TG
533RA058 TG
2310RA048 TG
1
3...4
1
5.5.2 Chain Catcher
- Reassemble in the reverse sequence.
1
: Position the replacement chain catcher (1) so...
Instruction Manual - Page 79
...Installing
- Open the oil tank cap and drain
the oil tank.
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 Remove the oil pump, b 11... with the oil supply system, first check the oil tank and the pickup body.
- Remove the brake band, b 5.2
- Chain Lubrication
11.1 Pickup Body
11.2 Oil Suction Hose
...
Instruction Manual - Page 97
... out any adjustments: - Troubleshooting, b 3.6
-
Saw chain runs while engine is usually necessary to change the setting of...MS 231 C, MS 251, MS 251 C
Inspect the spark arresting screen (if fitted) and clean or replace if necessary, b 3.7 or b 6.1
2310RA285 TG
- Erratic idling behavior, poor acceleration (although standard setting is a risk of engine damage as a result of lack...
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