[Supras] ARP-2.2 mm Cometic head bolt retorquing

[Jim Jobe]

I was clarifying the terminology.  Torque to Yield is commonly used
synonymously with the torque angle method where a bolt is first
torqued then turned a number of degrees to put the bolt in it's
yield region.  Nothing (to my knowledge) for the 7M has been
designed to be set using the torque angle method.

On Mon, Oct 29, 2007 at 12:01:17PM -0400, Walker, Brian (Rich. Dist) wrote:
> Really, I thought that was the original problem (stock spec not being
> beyond yield) and the reason people suggest not re-using stock bolts.
> I'm not debating the need for retorquing, just stating what I thought
> was a reason the torque may not have backed off (unlike wheel lugs which
> can loosen considerably). Personally I wouldn't want someone doing
> engine work that wasn't familiar with Al. heads or I-6's. 
> 
> Thanks for the insight on the gauges Jim, I didn't realize some are
> glycol/oil filled. I'll make sure that's what I'm using.
> 
> -----Original Message-----
> From: Jim Jobe [mailto:jjobe2 at supratech.org] 
> Sent: Monday, October 29, 2007 9:57 AM
> To: Walker, Brian (Rich. Dist)
> Cc: berniek at technicaldevelop.com; Supras at supras.com
> Subject: Re: [Supras] ARP-2.2 mm Cometic head bolt retorquing
> 
> 
> Neither stock no ARP bolts/studs for the 7M are TTY.  I've always
> retorqued once after a few thousand miles but make sure to turn the
> bolts/nuts as little as possible when breaking free to avoid losing all
> clamping force on the HG.  This is a very subjective area and most of
> the "racers" and "engine builders"
> do not have experience with inline 6's, much less those with aluminum
> heads.
> 
> Most fuel pressure gauages are oil filled.  They leak oil (and only a
> little) when broken, not fuel unless the internals broken too.  Most
> have a rubber plug on the back where you can refill them.  The problem
> with them however is the reading will change with temperature.