Coddy Posted June 24, 2011 Report Share Posted June 24, 2011 (edited) Hi all As some of you know, I have been rebuilding a Yamaha 40HP 2-stroke outboard for some time. During the dismantling I sheared a number of bolts due to corrosion and salt build up. Now stainless steel bolts and aluminium do not go well together and after a number of years they tend to corrode. The steering clamp on my outboard had a broken bolt left in the housing and I tried to drill out the broken part but was not successful and even Brian, of Megabyte fame, could not get this out. I went to a friendly engineering company to see if they could help and they suggested I try Multispark. Not knowing about this process I went along and the guys there explained they can spark erode the old broken bolt out of the hole without damage to the thread. 2 hours later I collected the part and it was if there had never been a broken bolt in the hole. All I had to do was run a tap down the thread to make sure it was clean and that was it! They did advise me that should it happen again, DO NOT try to drill it out as leaving as is makes it easier for them to remove. If you have a similar problem I can recommend these guys at: Multispark Erosion Ltd, Dawkins Business Centre, Dawkins Road, Hamworthy BH15 4JY Tele 01202 668989 Email dave@multispark.co.uk Contact Dave Sheldon Dave Edited June 24, 2011 by Coddy Quote Link to comment Share on other sites More sharing options...
mike02380 Posted June 24, 2011 Report Share Posted June 24, 2011 what kind of cost are we talking? Quote Link to comment Share on other sites More sharing options...
Brian Posted June 24, 2011 Report Share Posted June 24, 2011 Hi Dave Glad you got it sorted ok. Quote Link to comment Share on other sites More sharing options...
Coddy Posted June 24, 2011 Author Report Share Posted June 24, 2011 Hi Mike Cost me Quote Link to comment Share on other sites More sharing options...
mike02380 Posted June 24, 2011 Report Share Posted June 24, 2011 cheers Dave, that doesn't sound too bad Quote Link to comment Share on other sites More sharing options...
Jim Posted June 24, 2011 Report Share Posted June 24, 2011 Money well spent Dave. Glad you got it sorted. Jim Quote Link to comment Share on other sites More sharing options...
duncan Posted June 26, 2011 Report Share Posted June 26, 2011 really useful - thanks Quote Link to comment Share on other sites More sharing options...
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