Non Standard Piston

[Bob Culver]

From what I have seen have limited faith in the non magnet penetrant kits, esp if outside use by date. But with a bar magnet and black fluid  can find totally invisible cracks in polished surfaces. With steering arms easy to overlook the seating radius (which if fully seated and tensioned should not develop a crack, but do). I have infected members of the Jowett club with crack hunting fever. Uncracked Bradford cranks very rare but of cast iron and seem to operate cracked for most of life. Club recently found one out of 12! On the least cracked of world's 2 bearing 4 cyl 10 hp Jowetts the  local crank showed small cracks. Ground out. Ideally should be peened.
(It is somewaht curious that primitve plodding Bradfords fetch more than very driveable Javelins!)