At 06:25 PM 6/25/02 -0400, BillDentin@aol.com wrote:
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>From: BillDentin@aol.com
>Full-name: BillDentin
>Message-ID: <42.2937f4b3.2a4a36fe@aol.com>
>Date: Tue, 25 Jun 2002 17:13:34 EDT
>Subject: STEERING RACKS
>To: RDWISMER@aol.com
>MIME-Version: 1.0
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>
>Amici:
>
>We are starting to acquire the parts necessary for repairing the THUNDER
>BOLT, which got banged up at SVRA ROAD AMERICA last month. One thing we need
>is a new steering rack. This rack is either a TR4 or TR6. Can anybody tell
>me a quick and dirty way to check to see which one it is? I think the TR6
>rack is the wider of the two, but I can't remember. Are there markings that
>will answer this question?
>
>Appreciate any help offered.
>
>Bill Dentinger
I measured the steering racks on my street TR6 and my TR4 race car.
To the best of my ability to measure, they are identical. In addition, the
housing and the rack are shown in the Moss TR6 and TR4 catalogs as the same
part number, although they are no longer available.
I also tried to measure the tie rods, difficult because the rubber boots
are installed on both cars. I got the same measurement on the two cars so
that was not much help.
For tie rods, the Moss catalog shows TR4 as part 667-215 (again NLA) but
the TR4A and TR6 part numbers are identical, 667-220.
Therefore it would appear that the rack and pinion housing and assembly
were the same for all the cars, but the tie rods differed. I know that the
steering arms, which bolt to the trunnions, and to which the tie rod end is
fastened, are different between the TR4 and TR4A/6. At this point I'm only
guessing, but I'll bet that the difference is just in the length of the tie
rods, to make up for the difference in the steering arms.
By the way, the uprights and trunions for the TR4A and tR6 are more stout
than the TR4 parts, but they require different bushings and the matching
lower a-arms which are machined differently at the outer end to accept the
proper bushings.
uncle jack
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