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Tight Screws

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 Topic moved: from General Bike Chat to The Workshop by G (10 Jan 2006 - 22:05)
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xploitation
Nitrous Nuisance



Joined: 29 Sep 2005
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PostPosted: 22:00 - 10 Jan 2006    Post subject: Tight Screws Reply with quote
What would be the best thing for loosening screws from the crank case?

cheers Thumbs Up
Cannon
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extreme3d
World Chat Champion



Joined: 27 Dec 2004
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PostPosted: 22:07 - 10 Jan 2006    Post subject: Reply with quote
Apply 'Plus Gas' to the bolts and leave them for an hour. It's basically an ultra thin WD40 which works its way down the thread to aid removal.
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MikeH
Brolly Dolly



Joined: 10 Dec 2005
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PostPosted: 22:10 - 10 Jan 2006    Post subject: Reply with quote
Also if they're screw heads as opposed to bolts then a good tap with an impact driver to start them helps off before you chew the heads trying with a normal screwdriver.
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Jamie.
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Joined: 27 Dec 2005
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PostPosted: 23:05 - 10 Jan 2006    Post subject: Reply with quote
if you can, use vice-grips then replace the screws after
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 12:34 - 11 Jan 2006    Post subject: Reply with quote
-Jamie- wrote:
if you can, use vice-grips then replace the screws after


You should go to hell for that answer.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 17:13 - 11 Jan 2006    Post subject: Reply with quote
I like to use a bit and brace for those things. One of the old fashioned drill braces with a screw bit held in the chuck. You can put a lot of pressure down onto the screw with your chest and use the handle to 'crack' them off. You sometimes need someone at the other side of the bike to counteract your pressure or you might topple it off the stand.
https://www.abbeypowertools.co.uk/webupload/APOWER/DRAPER/APOWERSMALL13840_404.jpg

Remember that it is important that the screwdriver is clean and a good fit in the screw head to avoid burring.

If you can, it is a good idea to replace those crosshead screws with socket head cap screws (that take an allen key) these are much less likely to burr when you remove them. You can buy socket-head 'kits' for most bikes that contain all the correct set screws to do the job.
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Jamie.
World Chat Champion



Joined: 27 Dec 2005
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PostPosted: 00:40 - 12 Jan 2006    Post subject: Reply with quote
sickpup wrote:
-Jamie- wrote:
if you can, use vice-grips then replace the screws after


You should go to hell for that answer.


sorry, why?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 00:49 - 12 Jan 2006    Post subject: Reply with quote
-Jamie- wrote:


sorry, why?


Because you'll chew the heads up and have to replace them. Why do that when you can take them out the way they are supposed to come out?

Replacing crankcase cover bolts is not always a simple thing. Some of them are difficult sizes to get hold of, especially the longer ones.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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sickpup
Old Timer



Joined: 21 Apr 2004
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PostPosted: 05:57 - 12 Jan 2006    Post subject: Reply with quote
-Jamie- wrote:

sorry, why?


As Stinkwheel says.

Also why destroy something with a set of vice grips which should always be a tool of last resort when the offending item may come out easily with the correct tool?

You leave yourself little room for problems.
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mr.z
World Chat Champion



Joined: 04 Feb 2004
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PostPosted: 10:20 - 12 Jan 2006    Post subject: Reply with quote
(supposedly) valve grinding paste will help when attacking stubborn screws, gives the driveing bit something to grip and helps prevent it getting mauled.. tryed it once or twice and seemed to help..

Got a cg125 engine with all screws on the side that haven't moved since the 70's so i guess i'll be trying some of these out myself.. why oh why did they use them in the first place? Neutral

extreme3d wrote:
Apply 'Plus Gas' to the bolts and leave them for an hour. It's basically]an ultra thin WD40..


Where abouts do you get it? Sounds good Thumbs Up

EDIT: The other thing you can do is heat the area arround the screw/nut/bolt with a small torch, but it can cause warping in some cases so best be carefull when you use it.. also theres cans of "freeze" spray, it lowers the tempreture of the offending article so it contracts very slightly makeing it easyer to get out, this has worked very well in the past, sometimes heating arround then freezeing.
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