Coilus interruptus

Can you clarify your recent point about European road springs, and does this affect all European car manufacturers. Your recommendation to replace a broken spring with a matching new pair has also been noted and is what one would expect from all reputable car manufacturers to avoid road holding imbalance, different cornering characteristics due to the difference in spring stiffness between an old and new spring, to say nothing of the old spring being weakened due to the increase in stress placed upon it. There is no doubt a greatly increased risk of further component failure, which may well cause consequential damage. So your advice was responsible, excellent and spot on.

Asked on 12 September 2009 by

Answered by Honest John
I’ve replied on the springs issue several thousand times in the past, though it’s probably only been printed about half a dozen times. Many European springs are made to order by a company called Lesjofors in Sweden. A combination of things have happened. Manufacturers have cut the costs which means the springs are no longer finished at the ends by flattening, tapering or pigtailing. Combined with poor seating in the suspension cups of the cars to which they are fitted, this means forces are not evenly spread through the bases of the springs but are concentrated on the ends. The springs are not made of the best pure carbon steel and instead contain an element of scrap. The cups the springs sit in can get filled with salty mud in winter, which promoted corrosion of the springs at the ends. Shocks from speed humps then set up stress fractures. The springs usually break first thing in the morning when the springs are at their coolest and most brittle
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