Ted,
Thanks for the clarification.
That set-screw is there to lock into an indentation in the top of the rocker
shaft to prevent the shaft from rotating.
If the shaft were to rotate, it would change the alignment of the oil feed
hole with the drilling in the rear pedestal, which feeds oil to the rocker
assembly. When tightening this set screw, all that is necessary is to get it
tight enough that you can feel it has engaged with the indentation in the
shaft, and then to have the rectangular head align with the oblong hole in
the keeper washer that sits over it to stop it backing out.
Lawrie
British Sportscar Center
-----Original Message-----
From: Ted S. <cessna@speakeasy.org>
To: Lawrie Alexander <Lawrie@britcars.com>
Date: Sunday, March 19, 2000 9:08 PM
Subject: Re: correct procedure to tighten the set screw on the back of the
rocker shaft
>thanks Lawrie.
>
>the set screw I am talking about is actually on the rear most pedestal on
>the top, it looks like it is suppose to tighten ? against the shaft. there
>is a keyed washer on top that holds the set screw. I've seen this on
several
>rocker shafts lately, so I know I'm not making this up.
>
>thanks, Ted
>----- Original Message -----
>From: "Lawrie Alexander" <Lawrie@britcars.com>
>To: "Ted S." <cessna@speakeasy.org>; "mgs" <mgs@autox.team.net>
>Sent: Sunday, March 19, 2000 4:53 PM
>Subject: Re: correct procedure to tighten the set screw on the back of the
>rocker shaft
>
>
>> Ted,
>>
>> Your first paragraph makes absolutely no sense to me so I can't advise
you
>> there.
>>
>> As to there being shims under the two center pedestals of the rocker
>> assembly, these were fitted by the factory on later engines. The idea is
>> that they very slightly bow the rocker shaft so that is is gripped better
>by
>> the pedestals; otherwise, since there is no way to tighten the shaft into
>> the pedestal, it can move around, which results in wear and additional
>> noise. If your engine does not have those shims, they are available from
>> Moss under part number 460-255. While the factory fitted them only from
>18GB
>> engines forward, it's a good idea to fit them to earlier engines, even
MGA
>> engines.
>>
>> Lawrie
>> British Sportscar Center
>> -----Original Message-----
>> From: Ted S. <cessna@speakeasy.org>
>> To: mgs <mgs@autox.team.net>
>> Date: Sunday, March 19, 2000 9:16 AM
>> Subject: correct procedure to tighten the set screw on the back of the
>> rocker shaft
>>
>>
>> >question: I took my rocker arm off and found that the set screw was
>> >essentially loose, in that it took a turn or two to get it to set on the
>> >shaft, in order to lock it with the top plate, I had to back it off a
>> >quarter turn. Is this the correct procedure ?
>> >
>> >also my one of my manuals made a reference to two shims underneath the
>> >center two pedastals. I didn't find any shims in the classical sense of
a
>> >shim anywhere.
>> >
>> >was this an opps from the PO ?
>> >
>> >thanks, Ted Stowe
>> >
>>
>
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