Upstoke Posted November 5, 2014 Share Posted November 5, 2014 Tried to fit a new exhaust bobbin, purchased from CC, last weekend. Easy I thought. Nuts from old one wouldn't thread on new bobbin. Both should be metric. CC sent me new nuts. Came to fit tonight and still will not thread on . Am I doing something numpty like wrong? Or is it just a case of a couple of spanners and brute force? Any advice please. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 5, 2014 Member Share Posted November 5, 2014 Identify both threads using known nuts and bolts, a printable thread gauge, or this app. Don't use brute force until you know.Jonathan Link to comment Share on other sites More sharing options...
SM25T Posted November 6, 2014 Share Posted November 6, 2014 Nuts should start by hand. If a nyloc nut, the nylon bit must me the other end of the nut. Original bobbins had a 5/16" thread. New have M8 as I understand it. Get a bobbin with nuts from Halfords or eBay. Link to comment Share on other sites More sharing options...
SM25T Posted November 6, 2014 Share Posted November 6, 2014 YHM Link to comment Share on other sites More sharing options...
AntonyH Posted November 6, 2014 Share Posted November 6, 2014 This might sound silly - have you tried putting a nut on both ends of the bobbin, or just one?Just thinking it's possible that the bobbin thread may be damaged at the end and that is what's preventing the nuts from engaging. Even a small, difficult-to-see amount of damage or sprue to the threads can cause a problem. Would seem unlikely if it's both ends though, when "We found an old bobbin down the back of the sofa and sent you that" might be the issue... Link to comment Share on other sites More sharing options...
SM25T Posted November 6, 2014 Share Posted November 6, 2014 Sofa ..... exactly !! Link to comment Share on other sites More sharing options...
john milner Posted November 6, 2014 Share Posted November 6, 2014 Could a radiator bobbin be involved? They are good as a quick fix but on my K series they have a different thread sizes to the exhaust bobbin. Link to comment Share on other sites More sharing options...
Upstoke Posted November 6, 2014 Author Share Posted November 6, 2014 Cheers for the comments. Had two new bobbins to try. None will thread. CC sent me new nuts as they said new bobbin was metric. Nuts they sent, according to the invoice, are 5/16" UNF full plain. These don't strike me as being me very metric! However they fit smashing on the old bobbin. Think I need to visit a local purveyor of metric nuts. As an aside do any of you think it's worth fitting Nyloc rather than standard nut and washer originally fitted? Link to comment Share on other sites More sharing options...
SM25T Posted November 6, 2014 Share Posted November 6, 2014 Not had a standard nut come loose .... I use a flat and spring or shakeproof washer Link to comment Share on other sites More sharing options...
SM25T Posted November 6, 2014 Share Posted November 6, 2014 Told you they weren't the sharpest ! Link to comment Share on other sites More sharing options...
6speedmanual Posted November 7, 2014 Share Posted November 7, 2014 Brass nuts good for that application too. If correctly tightend shouldn't need any locking device, compound, washers. As the ru bber is notorious for failing, a loop of coathangar wire through bracket and exhaust lug will save your pipe being mullered on the riad if the bobbin fails. Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted November 7, 2014 Area Representative Share Posted November 7, 2014 Stokie,i can help with nuts :-) 'happy to help. I'm about all weekend if you'd like to drop in. Link to comment Share on other sites More sharing options...
Upstoke Posted November 7, 2014 Author Share Posted November 7, 2014 Thanks Richard. Have found a couple of nuts which fit fine, but appreciate your offer . Seems a metric nut best fits a metric bobbin. Must let CC know as it's sure to speed up production. Just need to sort out the fog light for the MOT. Watch out for another thread on that issue! Cheers Jim. Link to comment Share on other sites More sharing options...
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