Stihl MS 251 Instruction Manual - Page 32
Bar Mounting Stud, In such a case use the collar stud - c parts list
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5.6 Bar Mounting Stud - Remove the chain sprocket cover. 2 1 Repair solution If the thread in the engine housing is badly damaged or stripped it will not be possible to tighten the standard collar stud to the specified torque - the security of the collar stud is no longer guaranteed. In such a case use the collar stud in the screw list as a repair solution, b 2.5. 1 2310RA046 TG 2310RA047 TG : Push stud puller 5910 893 0501 (1) over the collar stud (2) as far as it will go and unscrew the stud counterclockwise. - Coat the collar stud with threadlocking adhesive, fit and tighten down firmly, b 14 - Remove the standard collar stud - do not re-drill the hole. - Reassemble all other parts in the reverse sequence. : Coat the thread of the collar stud (1) with threadlocking adhesive, b 14 - Fit the collar stud by hand so that it engages the existing thread. - Screw home the collar stud and tighten it down firmly. - Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C 31