The reaction arm is number 53, External Engine diagram, in the Moss TR4
catalog. I suspect the purpose (or puppies) of the arm is to prevent the
engine from rocking clockwise when accelerated hard. If the bumper
is gone, or the mounting bolts are loose, this could cause a banging
noise. Hey, that's a thought, I'm off to check if this arm is mounted to
the TR4A also...
Cliff
At 05:37 PM 9/7/98 -0400, Chip Old wrote:
>
>On Mon, 7 Sep 1998, Brian Sanborn wrote:
>
>> What is the purpose of the Torque Reaction Arm and its adjustable bumper
>> that looks like it rides on the frame. It is attached to the engine front
>> plate below the RH engine mount. I thought the rubber might be worn and the
>> metal was hitting metal on the frame.
>>
>> I went looking for this thing on my car and it is not there. What would be
>> the effect of not having one.
>>
>> It is shown in the workshop manual and Moss/VC books but not in the TR4 or
>> TR4A Parts catalogs.
>
>It is listed in the TR4 Parts Catalog, but not illustrated. The page
>number may vary depending on what edition (or reprint) you have. In mine
>it is on page 2 of the Engine section:
>
>Part No. Description
>-------- -----------
>133471 Bracket, engine restrictor
>650325 Buffer, assembly, engine restrictor
>612067 Buffer, rubber
>HN2008 Nut
>WL0208 Washer, spring
>
>Its purpose is to prevent the engine from rocking excessively. If you
>don't have one, or if it is misadjusted, or if the rubber bushing is
>deteriorated, that could be the cause of your under-hood knocking.
>
>-----------------------------------------------------------------------
>Chip Old 1948 M.G. TC TC6710 NEMGTR #2271
>Cub Hill, Maryland 1962 Triumph TR4 CT3154LO
>fold@bcpl.net
>
>
Cliff Hansen
chansen@exis.net
1966 TR-4A CTC 64615L
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