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Author Topic: Stihl 031 AV, Pulling the Clutch?  (Read 3726 times)

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Offline Gilman

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Stihl 031 AV, Pulling the Clutch?
« on: December 13, 2007, 11:31:18 pm »
I need to change the sprocket but am not sure if the external style clutch is treaded on, or a slip fit.  I don't want to try pulling it off if it is threaded on.   :o

WM LT70, WM 40 Super, WM  '89 40HD
Cat throwing champion 1996, 1997, 1999. (retired)

Offline sawguy21

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #1 on: December 13, 2007, 11:36:38 pm »
It is a right hand thread, loosen clockwise. You can make a piston stop by knotting a starter rope and feeding it into the spark plug hole. Then rotate the crank clockwise until the piston stops against the knot. Just be careful not to feed the rope too far in and have it catch in the ports.
old age and treachery will always overcome youth and enthusiasm

Offline Furby

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #2 on: December 14, 2007, 12:57:16 am »
Um, I though that you loosen right hand threads by turning counter clockwise?

Offline John Bartley

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #3 on: December 14, 2007, 07:13:42 am »
I "think" that sawguy21 has it pretty close, but I also think furby is right. It's been a longgggg time since I worked on an 031, but I think the clutch is LH thread and so it screws off by turning it clockwise. The rope trick  for a piston stop is what I've always used in the shop - it works well and is gentle on the top of the piston.

I have a scan of the clutch parts here - let me know if you'd like the link - I haven't figured out how to insert it here yet... :P

cheers eh?
Kioti DK35HSE w/loader & forks
Champion 25hp band mill, 20' bed
Stihl MS361
Stihl 026

Offline Kevin

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #4 on: December 14, 2007, 09:24:55 am »
It has left hand threads, turn clockwise to remove.

Offline sawguy21

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #5 on: December 14, 2007, 10:21:06 am »
OOOPS, you are right, I MEANT left. :D
old age and treachery will always overcome youth and enthusiasm

Offline Gilman

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #6 on: December 14, 2007, 06:46:35 pm »
Can I use a brass punch to start it turning?  Or, do I need a special tool?

Thanks
WM LT70, WM 40 Super, WM  '89 40HD
Cat throwing champion 1996, 1997, 1999. (retired)

Offline Kevin

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #7 on: December 14, 2007, 08:00:49 pm »
A brass punch should work ok.

Offline logwalker

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #8 on: December 16, 2007, 06:00:33 pm »
I use a air impact driver to spin them off. I use to put back on also.
Let's all be careful out there tomorrow. Lt40hd, 22' Kenworth Flatbed rollback dump, MM45B Mitsubishi trackhoe, Clark5000lb Forklift, Kubota L2850 tractor

Offline Furby

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #9 on: December 16, 2007, 06:06:19 pm »
What about the pounding on the bearings when using an impact wrench?

Offline John Bartley

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #10 on: December 16, 2007, 07:31:29 pm »
I use a 3/8"butterfly impact - lots of impacts but not much power. The impacts are rotational, so there's no effect on crank main bearings. When I'm using the impact I don't use any sort of stop in the cylinder - just rely on inertia/momentum, so there's very little effect on the rod bearings. If the butterfly won't do it right away, I lock the piston with a rope and then use a wrench or ratchet with a socket. I wouldn't use an impact with the piston locked - I watched a guy break the top off a cylinder one time doing that.

cheers eh?
Kioti DK35HSE w/loader & forks
Champion 25hp band mill, 20' bed
Stihl MS361
Stihl 026

Offline Kevin

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #11 on: December 16, 2007, 07:42:51 pm »
If he's asking about a punch I assume he has a drive plate and not a nut.

Offline logwalker

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #12 on: December 17, 2007, 07:32:52 pm »
John B. is correct about the rotational force not effecting the bearings. Putting it back on it comes against the dogs on the pull starter and if not careful it would be possible to damage the mechanism. So I barely tighten when going on. But when coming of "Git 'er done". You won't hurt a thing. Joe
Let's all be careful out there tomorrow. Lt40hd, 22' Kenworth Flatbed rollback dump, MM45B Mitsubishi trackhoe, Clark5000lb Forklift, Kubota L2850 tractor

Offline Gilman

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #13 on: December 18, 2007, 11:36:52 am »
I have the nut off but was wondering about the clutch.  Is the clutch threaded?
WM LT70, WM 40 Super, WM  '89 40HD
Cat throwing champion 1996, 1997, 1999. (retired)

Offline Kevin

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #14 on: December 18, 2007, 12:45:58 pm »
Yes the clutch is threaded the same as the nut.

Offline Gilman

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #15 on: December 19, 2007, 06:38:36 pm »
Thanks everyone
WM LT70, WM 40 Super, WM  '89 40HD
Cat throwing champion 1996, 1997, 1999. (retired)

Offline Kevin

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Re: Stihl 031 AV, Pulling the Clutch?
« Reply #16 on: December 19, 2007, 08:37:35 pm »
Don't forget to inspect and grease the bearing.