Stihl MS 251 CB-E Support Question
Stihl MS 251 CB-E Support Question
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Question posted by abelrick17 on November 13th, 2020
How To Install Oil Line On Styhl Ms251
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Current Answers
Answer #1: Posted by hzplj9 on November 14th, 2020 10:04 AM
hzplj9
Member since:
June 25th, 2012 Points: 4,875,670
Member since:
June 25th, 2012 Points: 4,875,670
To install a replacement oil line will entail major dis-assembly. The oil line goes from the tank behind the drive mechanism and clutch assembly. It entails removing the brake assembly which can be difficult to re-assemble due to the strong springs used. There are numerous videos on youtube explaining how to fix these chainsaws and I would strongly advise watching them and make yourself confident in doing the job. I have attached a user guide but that does not refer to this level of repair.
https://www.manualslib.com/manual/979239/Stihl-Ms-271.html#product-MS%20251
If in doubt take it to a qualified repairman to be sure of a fix.
Hope that helps.
Related Stihl MS 251 CB-E Manual Pages
Instruction Manual - Page 2
...44
7. Ignition System
45
7.1 Ignition Timing
45
7.2 Preseparator
45
7.3 Install new
ignition module
45
7.4 Testing the
Ignition Module
47
7.5 Spark Plug...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 5
... instruction manual. Install new fuel hoses... fuel hoses in line with local environmental regulations...oils and fuels
Collect fuel or lubricating oil in a clean container and dispose of it properly in accordance with the connector, preferably by the STIHL part number, the { logo and the STIHL parts symbol K This symbol may result in damage to overheating.
4
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 6
...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 ... 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
.... For this 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...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
... 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 C
11 3.3 Chain...
Instruction Manual - Page 15
key in flywheel has sheared off
Install new flywheel
Weak magnetization in flywheel Install new flywheel
Irregular spark
Check operation of the spark plug, clean or replace spark plug if necessary.
14
MS 231, MS 231 C, MS 251, MS 251 C If sooting keeps recurring, check air filter
Fuel/oil mixture - Check operation of switch shaft/ contact spring and ignition module...
Instruction Manual - Page 16
...Tank vent faulty
Replace tank vent
Leak on fuel hose from tank to carburetor
Seal connections or install new fuel hose
Engine loses power during acceleration
Sealing ring or spring in valve seat or cone... replace if necessary. foreign matter in accelerator Install new carburetor pump worn or damaged
MS 231, MS 231 C, MS 251, MS 251 C
15
3.6 Carburetor
Condition Carburetor floods;
Instruction Manual - Page 17
... clutch springs
16
MS 231, 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 seals/engine pan
Throttle shutter does not close
Install new carburetor
Engine...
Instruction Manual - Page 19
... or damaged (cracks)
Intake manifold damaged / bore blocked
Remedy Replace the oil seals
Inspect engine pan, re-seal or replace if necessary. Fuel system - Clean bore or install new manifold. 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 -
Instruction Manual - Page 21
...the throttle wide and let go of the machine.
20
MS 231, MS 231 C, MS 251, MS 251 C If the chain brake does not operate properly, ...
2
OP
1
: Turn the brake band (1) to troubleshooting, b 3.2. Install a new brake band if there are noticeable signs of the saw chain ... (1). : Remove the cover (2).
219RA049 TG
Machines with chain oil, chips, fine particles of abrasion, etc.) and smoothing of ...
Instruction Manual - Page 30
...-hand end and the screw (3) is pushed fully into the adjusting screw (2) - Check position of fuel return hose and correct if necessary, b 12.11.3
- Troubleshooting, b 3.2
2 3
- 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
- Reassemble all other parts in the guide (arrow).
-
Instruction Manual - Page 35
..., MS 231 C, MS 251, MS 251 C Reassemble all other parts in the reverse sequence.
4
3
1
2
: Connect hose (1) of 0.5 bar.
Install the muffler, b 6.1
- 2 2
1
: Line up the flange (1) 1118 850 4200 and fit it can be located and the faulty part replaced. the sealing lip lifts away from the intake manifold.
- A test can be assumed that the oil seals are in...
Instruction Manual - Page 39
... oil seals into the bearing seats (arrows).
: Insert the screws (1) - Reassemble all other parts in the engine housing - - Viewing the engine from below with fresh sealant and install, b 6.6, b 14
- Use suitable press sleeves to line up and hold the engine in
1
the direction of the clutch and lift
it away.
38
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 41
... to
1
position the oil seals squarely and at the fixing pins - 23
1
3
21
2
1 3
2
2310RA105 TG 2310RA107 TG 2310RA109 TG
: Fit installing sleeve (1) 1141 893 4600 on the straight crankshaft stub and installing sleeve (2) 1118 893 4602 on to the straight and tapered crankshaft stubs as far as stop .
40
MS 231, MS 231 C, MS 251, MS 251 C they might...
Instruction Manual - Page 42
...b 6.6
-
MS 231, MS 231 C, MS 251, MS 251 C
41 Remove the engine, b 6.5
-
Press the engine pan carefully
1
into the crankcase.
-
a
938RA098 TG
: Apply a bead of sealant to damage the crankshaft stubs. - When fitting a replacement crankshaft, always install new ball bearings and oil seals.
2310RA112 TG
3
: Position the engine pan (1) so that the tab (2) lines up with...
Instruction Manual - Page 45
...Inspect the piston rings and replace if necessary, b 6.9
- Install the crankshaft, b 6.6
-
Install the crankshaft and new oil seals, b 6.5
: Position the new piston rings so that ... until the snap ring slips into the groove. Remove the piston, b 6.8
- Install the engine, b 6.5
44
MS 231, MS 231 C, MS 251, MS 251 C 6.9 Piston Rings
- Make sure the tool is held square on the piston pin...
Instruction Manual - Page 60
... the washer (1) is the same as for the
standard version.
2310RA206 TG
- MS 231, MS 231 C, MS 251, MS 251 C
59 the pawl moves outwards.
- The rounded part of the spring clip ... The removal
procedure is in line with resin-free oil,
1
spring clip (short arrow) must engage the starter post's groove.
: Push the straight part (3) of the
Installing
spring clip over the starter ...
Instruction Manual - Page 79
...
1
2310RA301 TG
Do not overstretch the suction hose.
- 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 Installing
- Troubleshooting, b 3.3
- Remove the clutch, b 4
- the straight side of dirt. Install the oil pump, b 11.3
- Check the oil suction hose and
pickup body and replace if
2
necessary.
- Pull...
Instruction Manual - Page 85
... the string (2) to simplify installation, b 14
- Install the carburetor carrier, b 12.8
2310RA328 TG
2
- Coat the grommet with wiring harness, b 12.3
- Remove the string.
: Line up grommet (1) of fuel hose (2) so that its straight side (arrow) butts against the manifold flange.
2
- Install the carburetor, b 12.5
84
MS 231, MS 231 C, MS 251, MS 251 C Install the throttle rod, b 10...
Instruction Manual - Page 111
... 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 C Testing engine and carburetor for leaks
Testing carburetor for leaks
Testing...
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