Tension bolt failures are not unknown in car racing so the guys came up with
coating them with RTV. It seems to work. It restrains the bolt from large
amplitude vibrations all along its length reducing the stress.

marc wiese wrote:

Have you guys noticed that Mazda does put "flexible" plastic casing on the
2 open bottom tension bolts (heat shrunk onto the two exposed sections),
ostensibly that is for resonance prevention. At least the 91 nt engines had
them.

 
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