Stihl MS 251 Support Question
Stihl MS 251 Support Question
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Question posted by Sportmod62t on November 17th, 2020
Oil Adjust
is bar oil flow adjustable on this saw?
Current Answers
Answer #1: Posted by freginold on November 17th, 2020 1:25 PM
freginold
Member since:
December 20th, 2011 Points: 23,253,885
Member since:
December 20th, 2011 Points: 23,253,885
No, the chain/bar oil flow is not adjustable. The MS 251 uses an automatic, speed-controlled pump.
Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
...
QuickStop Super
24
5.4.1 Adjusting
the brake cable
26
5.4.2 Brake cable
Removing...
30
5.5.2 Chain Catcher
30
5.6 Bar Mounting Stud 31
6. Ignition System
45...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...
Instruction Manual - Page 3
... 107
12.11.5 Tank Housing
108
13. Servicing Aids
112
2
MS 231, MS 231 C, MS 251, MS 251 C Contents
12.6 Servicing
the Carburetor
90
12.6.1 Metering Diaphragm 90
12.6.2 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...
Instruction Manual - Page 5
...fuel must be identified by hand, to overheating.
4
MS 231, MS 231 C, MS 251, MS 251 C
Do not smoke or bring any fire, flame ...with threadlocking adhesive. Storing and disposing of oils and fuels
Collect fuel or lubricating oil in a clean container and dispose of ... for servicing
Remove the chain sprocket cover, saw chain and guide bar before re-installing - Fuel system -
The...
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
Instruction Manual - Page 7
... reason it is observed. 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... 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 These...
Instruction Manual - Page 8
...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 ... 1.6 12.0 4.5 11.0
1), 3)
Remarks:
1) Screws with and without binding heads.
MS 231, MS 231 C, MS 251, MS 251 C
7
Tighten the screw clockwise to the specified torque. This procedure ensures that the screw...
Instruction Manual - Page 11
lockout lever not depressed
Brake cable overtensioned
Remedy Readjust brake cable
Reconnect or replace brake cable Adjust brake cable
Adjust brake cable
10
MS 231, MS 231 C, MS 251, MS 251 C Condition
Cause
QuickStop Super Coasting brake does not disengage even though lockout lever is depressed
Brake cable stretched
Brake cable disconnected or broken
QuickStop Super ...
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 3.3 Chain...
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
... temporary loss of the spark plug, clean or replace spark plug if necessary.
14
MS 231, MS 231 C, MS 251, MS 251 C too much oil
Use correct mixture of fuel and oil
Incorrect air gap between ignition Set air gap correctly module and flywheel
Flywheel cracked or damaged... new flywheel
Weak magnetization in flywheel Install new flywheel
Irregular spark
Check operation of adjustment -
Instruction Manual - Page 17
...speed 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...low speed 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 ... springs
16
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 18
...carburetor
Pump diaphragm damaged or fatigued
Fit new pump diaphragm
Ignition timing wrong, flywheel out of adjustment - low power
Remedy
Clean air filter or replace if necessary
Throttle shutter not opened fully Tank... and choke shaft, service or replace if necessary
MS 231, MS 231 C, MS 251, MS 251 C
17 Condition
Cause
Engine speed drops quickly under Air filter dirty load -
Instruction Manual - Page 19
... before looking for faults on fan housing
18
MS 231, MS 231 C, MS 251, MS 251 C Fuel system - Ignition system
Condition
Cause
Engine does not start easily, stalls Oil seals in fan housing dirty
Clean air inlet... leaking or damaged (cracks)
Intake manifold damaged / bore blocked
Remedy Replace the oil seals
Inspect engine pan, re-seal or replace if necessary. Clean bore or install new...
Instruction Manual - Page 21
... and the saw chain (less than 0.6 mm. Contamination (with QuickStop Super
- Remove the brake band without overstretching it from the underside of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C
A ...Take out the screws (1). : Remove the cover (2).
219RA049 TG
Machines with chain oil, chips, fine particles of abrasion, etc.) and smoothing of the friction surfaces of the...
Instruction Manual - Page 27
...
-
Release the lockout lever.
- Troubleshooting, b 3.2
- Checking condition and free travel must be the adjustment of the spring hook (arrow) is not the case, replace the brake spring.
- Lubricate the brake ... lever (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. Free travel
-
Instruction Manual - Page 28
... rotate freely.
2 1
- Disconnect the brake spring,
b 5.4
1
- 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 Reassemble all other parts in that position. Turn adjusting screw clockwise
to increase free travel on the brake cable retainer.
1 2
: Use 6mm open end wrench the set free travel...
Instruction Manual - Page 29
... 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 it is next to the retainer (2) and push it into the bore (arrow).
: Turn..., 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
Instruction Manual - Page 34
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 Always perform the vacuum test first and then the pressure test. Remove the shroud, b 6.4
c
1
1
b
- a = 13 mm... air to enter the engine and upset the fuel-air mixture. This makes adjustment of leaks.
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
...
Rem. MS 231, MS 231 C, MS 251, MS 251 C
111
Sealing exhaust port for leakage test 0.5 to 18 Nm 6 to 80 Nm Installing hookless snap rings in piston Sleeve for installing 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...
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