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Question posted by garyvette73 on April 16th, 2020

How Can I Increase To Chain Oil Flow On My Ms 251

I want to increase the flow of oil to the chain of my stihl ms 251

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Answer #1: Posted by hzplj9 on April 16th, 2020 1:11 PM

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hzplj9

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The oil flow is set by the motor as it revolves. If the flow is too slow or limited then the oilways will require cleaning as they often fill with debris from cutting. The major feed outlet is behind the chain bar at the top after removing it. Information and instruction books are available from www.Stihl.com

Hope that helps.

Related Stihl MS 251 Manual Pages

Instruction Manual - Page 2

...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...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

... Remove the chain sprocket cover, saw chain and guide ...MS 231 C, MS 251, MS 251 C Storing and disposing of oils and fuels Collect fuel or lubricating oil in a clean container and dispose of it properly in accordance with local environmental regulations. 1.2 Safety Precautions If the machine is started up in line with the connector, preferably by the STIHL part number, the { logo and the STIHL...

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 ...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

...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 / carburetor 3.5 P 6x26.5 Handlebar / tank...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 ...

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 ... and rotate it counterclockwise until it drops down slightly. 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 ...carrier 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 13

...spring very dirty or corroded Insufficient spring tension Rewind spring broken Clean or replace rewind spring Check rewind spring and increase tension Fit new rewind spring Starter rope cannot be pulled out Spring overtensioned far enough Check rewind spring and ...worn Install new carrier Spring loop in spring housing fatigued Install new spring housing 12 MS 231, MS 231 C, MS 251, MS 251 C

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

...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,...plug, clean or replace spark plug if necessary. 14 MS 231, MS 231 C, MS 251, MS 251 C Check ignition lead/module, replace ignition module if necessary. If sooting keeps recurring, check...

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 19

...Condition Cause Engine does not start easily, stalls Oil seals in fan housing dirty Clean air inlet on...oil seals Inspect engine pan, re-seal or replace if necessary. Air filter - Carburetor - Engine overheating Insufficient cylinder cooling. 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...

Instruction Manual - Page 21

... of the saw chain coming to an abrupt stop . : Take out the screws (1). : Remove the cover (2). 219RA049 TG Machines with chain oil, chips, fine ...chain saw. the chain must not rotate. : Pry the brake band (2) out of its remaining thickness is imperceptible to one of the most important safety devices on inside diameter and/or parts of the machine. 20 MS 231, MS 231 C, MS 251, MS 251...

Instruction Manual - Page 22

... seat. 2310RA009 TG 2310RA012 TG 1 The clutch drum must rotate freely when the chain brake is now relaxed. : Use the assembly tool 1117 890 0900 to disconnect the brake spring (1) from the brake lever. 2310RA015 TG MS 231, MS 231 C, MS 251, MS 251 C 21 Reassemble all other checks, b 5.1 - The brake spring is disengaged. 2 : Push the brake...

Instruction Manual - Page 25

TOP 2310RA031 TG - Remove the shroud, b 6.4 - Engage the chain brake. Troubleshooting, b 3.2 - Remove the fan housing, b 8.2 - Remove the brake band, b 5.2 1 1...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 if it is now relaxed. : Use the assembly tool 1117 890 0900 to disconnect the brake spring ...

Instruction Manual - Page 27

The brake band (1) must locate snugly against one another in the relaxed condition. Release the lockout lever. - Remove the chain brake cover, b 5.2 The brake cable must rotate freely. - Free travel is not the case, replace the brake spring. - ...to the anchor pin (2). : Use the assembly tool 1117 890 0900 to the brake lever (arrow). 26 MS 231, MS 231 C, MS 251, MS 251 C

Instruction Manual - Page 79

.... Installing - Pull off the pickup body (1), check it . - 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 Open the oil tank cap and drain the oil tank. 1 - Chain Lubrication 11.1 Pickup Body 11.2 Oil Suction Hose Impurities gradually clog the fine pores of the pickup body and, if...

Instruction Manual - Page 96

...again to 3,300 rpm. 4. Making the mixture overlean increases the risk of 13,000 rpm is higher than ...MS 231 C, MS 251, MS 251 C 95 Inspect the spark arresting screen (if fitted) and clean or replace if necessary, b 3.7 or b 6.1 - It is necessary only if the high speed screw (H) or low speed screw (L) has to be replaced or after removing the limiter cap. Warm up the engine. Check chain...

Instruction Manual - Page 108

...- Check the oil fuel pump and replace if necessary. : Push the fuel return hose (1) onto the long nipple (2) and elbow connector (3). : Push the fuel suction hose (4) onto the short nipple (5) and the carburetor connector (6). - MS 231, MS 231 C, MS 251, MS 251 C 107 Check... tabs (arrows) together and pull out the manual fuel pump (1). - fuel must flow when the fuel pump is operated. -