Stihl MS 391 Service Workshop Manual

Stihl MS 391 Service Workshop Manual Repair

Stihl MS 391 Service Workshop Manual for the Stihl chainsaw. Repair and service the MS 391 with this manual, which contains clear repair photos. The manual contains diagrams and accurate information as used by professional mechanics and repair shops to troubleshoot and repair the chainsaw. View free page images online or download full PDF that you can print or view on any suitable device. The manuals have plenty of pictures and diagrams to make the entire repair process easy for you. Can be used as guides for other models as they may share key components such as motors.

Stihl MS 391 Service Workshop Manual Contents

Introduction, Specifications, Troubleshooting Attachments, Clutch, Engine, Ignition, Starter, Servicing, Controls, Fuel System, Special Tools.

The MS 391 PDF manual contains very detailed diagrams and descriptions. At the click of a mouse you have access to the most comprehensive diagnostic, repair and maintenance information as used by professional mechanics, technicians and repair workshops. Very clear and precise diagrams and instructions. The manual is designed to get the information you need quickly and easily.

Stihl MS 391 Specifications

Displacement 64.1 cm³
Weight 1) 6.4 kg
Power-to-weight ratio 1.9 kg/kW
Power output 3.3 kW/4.5 bhp
Recomm. max. bar length 50 cm/20″ cm
Vibration levels left/right 2) 4.0/4.0 m/s²
Oilomatic saw chain pitch/type 3/8″ Rapid Micro Comfort
Sound power level 3) 115.0 dB(A)
Sound pressure level 3) 105.0 dB(A)
1) without bar/chain
2) (K) factor according to Dir. 2006/42/EC = 2m/s²
3) Power factor according to DIR2006/42/EC=2.5(dB(A))
Power The peak power output of the MS 391 is 4.4HP, 33% more powerful than the average competitor.
Powerhead Weight It weighs 14.1 lbs, 2.9 lbs more than a typical chainsaw.
Minimum Chain Bar Length This model is compatible with bars as short as 16 inches long.
Maximum Chain Bar Length This model is compatible with bars as long as 20 inches long.
Decompression valve:
The decompression valve is part of the easy start-system. The valve should be pressed before starting in order to reduce the compression pressure when starting, as well as the effort needed to pull the starter rope. The decompression valve is semi-automatic, meaning that it must be pressed manually before starting, but then closes automatically.

Compensator:
This controller in the carburettor prevents the fuel-air mixture getting richer as the air filter becomes clogged. The correct quantity of fuel is delivered to the carburettor depending on the quantity of air passing through the air filter. This keeps the fuel/air ratio in the combustion mixture constant and hence also the engine power. The filter doesn’t need to be cleaned until an appreciable drop in power occurs.

Stihl MS 391 Service Workshop Manual Diagrams

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