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Stihl MS 311 User Manual - Page 91

Servicing Aids

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14. Servicing Aids No. Description Part No. 1 Lubricating grease (225 g tube) 0781 120 1111 2 STIHL special lubricant 0781 417 1315 3 STIHL press fluid OH 723 0781 957 9000 4 STIHL multipurpose grease 0781 120 1109 5 Dirko HT red sealant 0783 830 2000 6 Medium-strength threadlocking 0786 111 2101 adhesive (Loctite 242 or 243) 7 High-strength threadlocking adhesive (Loctite 648) 0786 111 2117 8 Standard commercial solventbased degreasant containing no chlorinated or halogenated hydrocarbons Application Oil seals, sliding and bearing points Bearing bore in rope rotor, rewind spring in fan housing Rubber components, AV elements Engine housing Cleaning sealing faces and carburetor, crankshaft stubs and flywheel taper 90 MS 311, MS 391

Section	Page
Contents	2
1. Introduction and Safety Precautions	4
1.1 Introduction	4
1.2 Safety Precautions	5
2. Specifications	6
2.1 Engine	6
2.2 Fuel System	6
2.3 Ignition System	6
2.4 Chain Lubrication	6
2.5 Tightening Torques	7
3. Troubleshooting	9
3.1 Clutch	9
3.2 Chain Drive, Chain Brake, Chain Tensioner	10
3.3 Chain Lubrication	11
3.4 Rewind Starter	12
3.5 Ignition System	13
3.6 Carburetor	14
3.7 Engine	17
4. Clutch	18
4.1 Clutch Drum	20
5. Chain Brake	21
5.1 Checking Operation	21
5.2 Brake Band	21
5.3 Brake Lever	23
5.4 Cam Lever	25
5.5 Pins	26
5.6 Chain Tensioner	26
5.7 Bar Mounting Studs	27
6. Engine	28
6.1 Muffler	28
6.2 Leakage Test	29
6.2.1 Preparations	29
6.2.2 Vacuum Test	30
6.2.3 Pressure Test	30
6.3 Oil Seals	31
6.4 Shroud	32
6.5 Cylinder / Crankshaft	33
6.6 Bearings / Crankshaft	36
6.7 Piston	37
6.8 Piston Rings	39
6.9 Decompression Valve	39
7. Ignition System	40
7.1 Ignition Timing	40
7.2 Preseparator	40
7.3 Ignition Module	40
7.4 Testing the Ignition Module	42
7.5 Spark Plug Boot / Ignition Lead	43
7.6 Flywheel	44
7.7 Short Circuit Wire	45
7.7.1 Testing	45
7.7.2 Removing and Installing	45
7.7.3 Ground Wire	47
7.7.4 Contact Spring	47
7.8 Ignition System Troubleshooting	49
8. Rewind Starter	52
8.1 General	52
8.2 Fan housing	52
8.2.1 Segment	52
8.3 Pawls	52
8.4 Rope Rotor	53
8.5 Starter Rope / Grip	54
8.6 Tensioning the Rewind Spring	55
8.7 Replacing the Rewind Spring	56
9. Servicing the AV System	58
9.1 Buffer on Oil Tank	58
9.2 AV Spring on Oil Tank	58
9.3 AV Spring on Fuel Tank	58
9.4 AV Spring on Front Handle	59
9.5 Stop Buffer at Clutch Side	60
9.6 Annular Buffer at Ignition Side	60
9.7 Handlebar	60
10. Control Levers	62
10.1 Master Control Lever	62
10.2 Throttle Trigger/Interlock Lever	62
10.2.1 Choke Rod	64
10.2.2 Throttle Rod	65
11. Chain Lubrication	66
11.1 Pickup Body	66
11.2 Oil Suction Hose	66
11.3 Oil Pump	67
11.4 Valve	68
12. Fuel System	69
12.1 Air Filter	69
12.2 Baffle	69
12.3 Filter Base	69
12.4 Air Guide Shroud	70
12.5 Carburetor	72
12.5.1 Leakage Test	72
12.6 Servicing the Carburetor	73
12.6.1 Metering Diaphragm	73
12.6.2 Inlet Needle	74
12.6.3 Pump Diaphragm	75
12.6.4 Air Valve	77
12.6.5 Levers on Throttle Shaft	77
12.6.6 Adjusting Screws	78
12.7 Carburetor Adjustment	80
12.7.1 Basic Setting	80
12.7.2 Standard Setting	81
12.8 Carburetor Carrier	82
12.9 Intake Manifold	83
12.10 Tank Vent	84
12.10.1 Testing	84
12.10.2 Removing and Installing	85
12.11 Fuel Intake	85
12.11.1 Pickup Body	85
12.11.2 Fuel Hose	86
12.11.3 Fuel Suction Hose	87
12.11.4 Tank Housing	88
13. Special Servicing Tools	89