jemgee Posted February 14, 2005 Report Share Posted February 14, 2005 Does anyone know of companies offering crack testing (I don't know how it is done?) in Merseyside area and the approx cost? I need to replace a crack tested rear hub unit (a spare borrowed from a friend) who got it at Malvern a couple of years ago. The usual suppliers do not seem to do crack tested units. Quote Link to post Share on other sites
jean Posted February 14, 2005 Report Share Posted February 14, 2005 Mike in auto repair shops crack testing is in general done with a dye and a developer. It's the most inexpensive way of crack checking. You spray a dye, mostly light red on the part, leave it for a short time and then wipe it off. After that you apply a developer to the part and any cracks will be displayed in red. Jean Quote Link to post Share on other sites
Guest ron Posted February 15, 2005 Report Share Posted February 15, 2005 Mike As Jean says, dye penetrant testing is very common in engineering workshops, we used to use it regularly at work, it came as a couple of aerosols, it would be an easy DIY job so it might be worth your while phoning around some engineering suppliers. Ron Quote Link to post Share on other sites
paul.taylor6 Posted February 15, 2005 Report Share Posted February 15, 2005 Mike Frost do crack testing aerosals, item code N160. Paul Quote Link to post Share on other sites
jemgee Posted February 15, 2005 Author Report Share Posted February 15, 2005 Thanks everyone - I've found a couple of websites with the aerosols and will check out local suppliers. Quote Link to post Share on other sites
Roger H Posted March 7, 2005 Report Share Posted March 7, 2005 A "home-brewed" method of testing is: Place the part in a moderate oven till it is heated through. Remove from oven and coat with oil - preferably a fine machine oil . Place back into a HOT oven and bake until the outside surfaces are "oil-free" (the oil should burn off). Remove (carefully!) from oven while hot. Allow to cool slightly. Dust with talcum powder. If a crack is present, oil in the crack will "stain" the talc. Quote Link to post Share on other sites
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