Today's Message Index:
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1. 04:29 AM - (Gary Casey)
2. 08:05 AM - Re: (Cy Galley)
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--> Engines-List message posted by: "Gary Casey" <glcasey@adelphia.net>
<<(On the O-360's) a Narrowdeck engine uses holddown plates underneath the
nuts on the cylinder base.
A Widedeck has a fatter base itself and therefore doesn't need these beef-up
plates.
I would assume the same to be true in the 540 series. But then, I am not
100% sure.
Good Luck to you,
Konrad>>
Thanks, Konrad. Yes, I am sure that's true of the 540's as well. As I
understand it the nut is different as well, since it is closer to the
cylinder on the narrow-deck engines and there is less wrench clearance. I'm
told the narrow-deck engines are actually stronger, apparently because the
bolts are closer to the cylinder, and they are preferred if one is to
increase the compression ratio to obtain more power. I was hoping to
identify the engine without looking at it so I could know what ad in TAP to
which I was going to respond. The Lycoming model number list doesn't
identify "wide deck." They do list the dash-number of the serial number as
either being -40 or -48, but that is presumably to separate the O- from the
IO- engines.
Gary Casey
Message 2
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--> Engines-List message posted by: "Cy Galley" <cgalley@qcbc.org>
The narrow deck on the 4 cylinders use an internal wrenching nut. (12 point
socket inside a cup)
Cy Galley, TC - Chair, Emergency Aircraft Repair, Oshkosh
Editor, EAA Safety Programs
cgalley@qcbc.org or experimenter@eaa.org
Always looking for articles for the Experimenter
----- Original Message -----
From: "Gary Casey" <glcasey@adelphia.net>
Subject: Engines-List:
> --> Engines-List message posted by: "Gary Casey" <glcasey@adelphia.net>
>
> <<(On the O-360's) a Narrowdeck engine uses holddown plates underneath the
> nuts on the cylinder base.
> A Widedeck has a fatter base itself and therefore doesn't need these
beef-up
> plates.
> I would assume the same to be true in the 540 series. But then, I am not
> 100% sure.
> Good Luck to you,
> Konrad>>
>
> Thanks, Konrad. Yes, I am sure that's true of the 540's as well. As I
> understand it the nut is different as well, since it is closer to the
> cylinder on the narrow-deck engines and there is less wrench clearance.
I'm
> told the narrow-deck engines are actually stronger, apparently because the
> bolts are closer to the cylinder, and they are preferred if one is to
> increase the compression ratio to obtain more power. I was hoping to
> identify the engine without looking at it so I could know what ad in TAP
to
> which I was going to respond. The Lycoming model number list doesn't
> identify "wide deck." They do list the dash-number of the serial number
as
> either being -40 or -48, but that is presumably to separate the O- from
the
> IO- engines.
>
> Gary Casey
>
>
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