tom jelly wrote:

Saw this on the RX list:

To: rx7@world.std.com
Subject: (rx7) [all] cracked tension bolt heads

tonight i've been dressing down my 13BT engine in

snips...

East Coast Rotary Aviation and Auto Products wrote:

I think they are actually "folds" in the metal from forging the bolt head. I
have seen this all of the time, mostly in the 86-88 bolts. I think the 89
and later bolt heads are formed a different way.
Bruce Turrentine

PS I've never seen a bolt failure where the head pulled off. The ones I've
seen failed about 5" from the head.

I want to mention for the new guys the way to prevent this is coat
them with red RTV before installation.

The ARP versions should show up any day now. Butch?

Paul Lamar

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