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Resolved: Torque on trunnion bolt - TR4A

To: ArthurK101 <ArthurK101@aol.com>, triumphs@Autox.Team.Net
Subject: Resolved: Torque on trunnion bolt - TR4A
From: Cliff Hansen <chansen@exis.net>
Date: Sat, 04 Apr 1998 20:23:44 -0500
Listers,

A well-deserved thanks goes to Chris Kantarjiev for providing
the correct torque and explaining why its different from the TR4.
Also, thank you Arthur Kelly, Peter Zaborski, and Robert Carley
for providing the TR6 torque and the TR4 data.  My car is back
together, once I get the air out of the brake lines I'll be back on
the road (for a drive right down to the alignment shop.)  I can't
wait to see how it handles.

I thought I'd post the answer here for posterity.

The proper torque is 50-65 ft-lbs, and should be torqued with
the car on the ground (and 150 lbs in each seat.)

The TR4A (and TR6) uses a sinlge bolt through the trunnion and
lower control arms.  Assembly is ASCII'd below for one lower
control arm:

Washers
  |            |
  |______|

<Trunnion bolt here>

  |------------|
  |            |

The order of assembly on the outer control arm is washer, steel sleeve,
washer.  The inside washer butts up against the trunnion, the outer
washer against the trunnion bolt head or castle nut.  The torque of 50 ft-lbs
compresses the washer-sleeve-washer.  The length of the sleeve is 
designed to provide sufficient end float to keep from smashing the
bushings.

In contrast, on the TR4, there are no steel sleeves.  Hence the castle
nut is adjusted to provide the proper clearance for the bushings.

Once again, thanks for your help.

Cliff Hansen
chansen@exis.net
1966 TR-4A  CTC 64615L (Anxious to be done with front end work)


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