Stihl MS 311 User Manual - Page 39
Piston Rings, Decompression Valve
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6.9 Decompression Valve 533RA136 TG 533RA134 TG 4903RA091 TG - Inspect the piston rings and replace if necessary, b 6.8 - Check the oil seals and ball bearings and replace if necessary, b 6.5 - Install the cylinder, b 6.5 : Install the new piston rings in the grooves so that the radii face upward (arrows). 1 - Remove the shroud, b 6.4 : Unscrew the decompression valve (1). - Reassemble all other parts in the reverse sequence. 533RA137 TG 6.8 Piston Rings - Remove the piston, b 6.7 - Remove the piston rings from the piston. : Position the piston rings so that the radii at the ring gap meet at the fixing pin in the piston groove (arrows). : Check correct installed position of the piston rings (arrows). - Install the piston, b 6.7 - Reassemble all other parts in the reverse sequence. : Check the sealing cone (arrow) on the decompression valve for damage. - If the sealing cone does not close completely or shows signs of damage, install a new decompression valve. - Fit the decompression valve and tighten it down firmly. 165RA164 TG 533RA135 TG : Use a piece of old piston ring to scrape the grooves (arrows) clean. - Reassemble all other parts in the reverse sequence. 38 MS 311, MS 391