Re: [Amc-list] Re; is this common?

[Ken Ames <ameskg@xxxxxxxxx>]

On the ones that broke for me it didn't matter if any of the valves was closed
or open. The first 1/10th of a turn was enough

Ken

Quoting "Swygert, Francis G MSgt 436 CES/CECM" <Francis.Swygert3@xxxxxxxxxxxx>:

> TomJ wrote: 
> 
> > The way he described it they broke just as he started loosening the
> first
> bolt.  But I'll check with him again this evening.
> 
> When both are tight and the cast aluminum bridge is down tight
> on the head, when you loosen one the other is under HIGH stress
> if a valve is open. I'd back the bolt out one turn or so. Then
> loosen the other one turn. Once you've they're both slightly
> loose, the bridge can tilt slightly against one bolt when you
> loosen the other. Lather, rinse, repeat.
> 
> That initial crack-loose is where they're most likely to break.
> Once they're up a few turns it's less likely, but having a cast
> aluminum part trying to hold a valve closed is an obvious lose.
> --------------
> 
> So it seems it would be best to loosen the rocker that's holding a valve
> down (or down the most) FIRST since the other side has less stress on
> it. I've experienced the same thing (broke cast bridge) on a six. 
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