Gazzar Posted March 13, 2011 Share Posted March 13, 2011 I've just rebuilt a series 1 gearbox and was out testing the refitted box the many times blessed layshaft went - I managed to limp home in 3rd and 4th but am now facing the task of rebuilding again! Before I start ripping out a layshaft from a spare gearbox I want to know if there is any DIY way of testing the replacement layshaft? Or should I just go and buy a new one for the comfort of it? Thanks! G. Quote Link to comment Share on other sites More sharing options...
P H Services Posted March 13, 2011 Share Posted March 13, 2011 You should be able to buy a dye penetrant kit which i think from memory comprises of 3 aerosols. I think you clean the component then spray on the dye clean off again and then spray with developer which then shows the dye creaping out of the crack if there is one !! I stand to be corrected because i haven't done any for years. Quote Link to comment Share on other sites More sharing options...
bishbosh Posted March 13, 2011 Share Posted March 13, 2011 Could also use Magnetic Particle Inspection which uses an iron filing solution and a magnet to identify cracks. Quote Link to comment Share on other sites More sharing options...
02jcole Posted March 13, 2011 Share Posted March 13, 2011 Dye penetrant can only detect surface cracks where as magnetic particle inspection can detect surface cracks and flaws in the material which are just below the surface. Both of these NDT methods can be performed in the home workshop without the need for very expensive equipment. Quote Link to comment Share on other sites More sharing options...
secondjeremy Posted March 14, 2011 Share Posted March 14, 2011 Will the shaft sound different if tapped with a spanner or light hammer? - like a brakedrum which rings if uncracked and sounds dull if it is. (Good old fashioned railway safety check!) Quote Link to comment Share on other sites More sharing options...
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