At 02:29 PM 5/1/98 -0400, JackiHarry wrote:
>I'll have to add a comment here; I have had significant problems with studs
>coming out, and sometimes wrecking the threads(in the head), on aluminum
>heads, esp. on the exhaust studs. Either loctite or anti-seize would help,
>probably, with the threads getting damaged, since this appears to happen from
>corrosion (the steel threads get rusty, and catch and rip loose chunks of the
>aluminum.). I have had the best luck loctiting the studs into the head with
>removable (222,242) loctite, and putting anti-seize on the nuts. (I *always*
>put loctite on any bolts going into aluminum; and if those bolts are
supposed
>to be torqued in, I reduce the torque 20-30%)
>
>And I have never had a problem heating up anything I have loctited to
break it
>loose-run an engine to heat it up, or use a propane torch, or oven, or
>soldering iron/gun. I have used all those methods to get loctited bolts out
>(snapped off or not).
>
>Take care, Scott M Ryan
>
I'll agree with you 100% an Aluminum head is another matter. And you are
right it is corrosion that is always a problem with aluminum (and the worst
combination is stainless with aluminum as in boat outdrives). I would
highly recomment using the waterproof grease and a high temp copper based
antiseize compound to prevent corrosion due to galvanic conduction
problems. I don't know the chemistry of it but it works much better than
the ordinary nickel based antiseize stuff.
Regards, Nils
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