Paul Philpot Posted July 2, 2021 Share Posted July 2, 2021 I'm removing the exhaust from my 1994 K series for some welding. I'll be replacing the bobbins and giving everything a polish. Any advice, pitfalls or things to be aware of?ThanksPaul Link to comment Share on other sites More sharing options...
SM25T Posted July 2, 2021 Share Posted July 2, 2021 If you don't already use the centre mount for another bobbin, find the bush on the chassis and fit a bracket. Assuming it lines up with where you can get a corresponding bracket welded to the exhaust. I am guessing the welding you are having done is because the inlet pipe fractured at the front of the silencer ? Link to comment Share on other sites More sharing options...
Paul Philpot Posted July 2, 2021 Author Share Posted July 2, 2021 Centre mount already fitted. The split is where the tailpipe meets the silencer. I'm surprised how easy the bolts are to move. Thanks for advice. Link to comment Share on other sites More sharing options...
SM25T Posted July 2, 2021 Share Posted July 2, 2021 Does that mean the bolts were loose .... that leads to fractures of the pipes ! Link to comment Share on other sites More sharing options...
Paul Philpot Posted July 2, 2021 Author Share Posted July 2, 2021 Good call! They took a little bit of persuading and WD40 but they seemed secure. Link to comment Share on other sites More sharing options...
SM25T Posted July 2, 2021 Share Posted July 2, 2021 PlusGas is a corrosion busting lubricant. Works best if applied day before and allowed to work into thread. WD40 is only designed to displace water. Link to comment Share on other sites More sharing options...
Toby S Posted July 2, 2021 Share Posted July 2, 2021 If the primaries and collection 4-1 are tarnished, Harpic loo cleaner takes off the tarnish and get them back to colour Link to comment Share on other sites More sharing options...
Sooty Posted July 2, 2021 Share Posted July 2, 2021 Rubber bobbins are not as robust as poly versions. I found that the stresses caused by the weight of the can extending out from the bracket leads to premature failure of the bobbin. A double bobbin solution helps. Will post a photo when I can work out how. Link to comment Share on other sites More sharing options...
Sooty Posted July 2, 2021 Share Posted July 2, 2021 Paul - see PM Link to comment Share on other sites More sharing options...
Sooty Posted July 2, 2021 Share Posted July 2, 2021 Link to comment Share on other sites More sharing options...
Paul Philpot Posted July 3, 2021 Author Share Posted July 3, 2021 SM25T. I used WD40 Fast Release Penetrant.Sooty. That looks like a good plan.Toby S. I'm off to buy some Harpic.Thanks for advice.Paul Link to comment Share on other sites More sharing options...
Sooty Posted July 3, 2021 Share Posted July 3, 2021 Paul If you want the stainless really clean then welders pickling paste is the stuff to shift all the heat discolouration but it is highly acidic and will take off paint and skin so needs handling carefully. It is at least twice as effective as harpic extra. The discolouration sits in the uneven surface of the metal so unless it it polished to a much flatter finish the discolouration will return as soon as it gets hot again. Hand polishing to that extent is a complete ball ache and you will need mechanical buffing which is still hard and laborious, but worth it, or pay a professional Link to comment Share on other sites More sharing options...
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