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1. 07:53 AM - Re: HS6, M14P,etc. valve adjustment. (Justin Drafts)
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| Subject: | Re: HS6, M14P,etc. valve adjustment. |
Excellent background, thanks for the research, much appreciated.
This is on my hangar mx agenda for today... Justin
On Sun, May 2, 2021 at 10:19 PM Walter Lannon <wlannon@shaw.ca> wrote:
> Checked the P&W Mtce manual today. exactly the same info as the
> Overhaul. No reference to any subject torque value.
>
> Also checked FAA AC 65-12, with a very comprehensive and detailed section
> on valve systems and processes including numerous pages on adjustment.
> They make no specific recommendations on torque values for adjustment
> nuts. They do make a reference to fastener torque in general stating that
> the manufacturers recommendations are to be followed. In this they give,
> as an example, the rocker cover hold down nuts used
> on many radial engines. These are light aluminum alloy and there has
> always been a history of over tightening, warping and subsequent leakage.
>
> As I mentioned earlier the jamb nut securing method has been around
> forever and is highly effective. The prime example of this is two plain
> nuts tightened to each other on a threaded shaft, bolt or similar. In this
> case the rocker arm serves as the second nut.
>
> My diatribe for the day !!!!!!!
> Walt
>
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