Listers, included in the original TR4 service manual that I have was one
service information sheet. I thought I would include it here since there
seem to be quite a few people doing front end rebuilds right now. There is
an important section towards the bottom about final assembly. I believe
this would apply to all TR4's, TR4A's and probably later cars as well.
Lately there have been some people on the list saying their suspension was
extremely tight after reassembly. Maybe this will have something to do
with that????
============================
Reference number 4/32.
INCREASED CASTOR ANGLE
T.R.4. Only
At commission # CT6344 (for wire wheels) and CT6390 (for disc wheels),
the castor angle was increased from 0 deg to 3 deg positive. This alteration
has resuilted in dimensional changes and necessitated a number of new
parts, particularly the bottom trunnions which now incorporate a 3 deg
angle, and are not interchangeable with each other.
The modified parts which are not interchangeable with those fitted to
vehicles prior to the above commission #'s, have been allocated new part
numbers as follows:-
0 deg castor
---------------
Bottom trunnion sub. assy. 101557 replaced by
(133838 rh and 133839 lh)
Upper wishbone ball joint assy. RH 200771 replaced by 109225
Upper wishbone ball joint assy. RH 200772 replaced by 109225
Upper wishbone ball grease nipple 56934 replaced by 501024
Attachment of vertical link to ball joint -
washer WP0011
same as before (2)
nut
LN2211 replaced by YN2911 (2)
pin
PC0020 no longer used
Attachment of top ball joint to upper wishbone -
distance piece 100697 replaced
by bolt 112347 (4)
washer WP0025
replace by WP0045 (4)
nut
61302 replaced by YN2909 (4)
pin
PC0012 no longer used
0 deg castor
3 deg castor
Upper wishbone assy
Front LHS 132632 both are
Front RHS 132633 replaced by
133504 (2)
Upper wishbone assy
Rear RHS 132632 both are
Rear LHS 132633 replaced by
133507 (2)
Tie rod lever RH 127830 replaced by 129836
Tie rod lever LH 127831 replaced by 129837
When replacements are required for vehicles prior to the above change, use
the earlier details.
If for any reason it is desired to modify the castor angle, replace all of the
above 0 deg components with the 3 deg components. Merely replacing the
trunnions will cause mis-alignment and result in breakage.
NOTE : - Overtightening the pivot pin nuts will cause a bending movement
in the vertical link and ultimate failure.
(IMPORTANT)********************
When overhauling the front suspension, it is vitally important to adopt the
following procedure, when assembling the lower wishbones to the
trunnions.
1. Assemble the parts as shown in the illustration.
2. Equally tighten each nut (47), to maintain the correct relationship
between the pivot and the bronze trunnion.
3. Continue tightening the nuts equally, to an initial torque load of 30
lb.ft. This permits the outer washer (46) to be serrated by the self cutting
splines located against the thrust washer (37).
4. Slacken the nuts and retighten to a torque load of 4 lb.ft.
5. Slacken the nuts by 1 1/2 to 2 flats to suit split pin insertion and to
permit 0.004" - 0.012" end float in the bearing.
6. Check the assembly for freedom of movement over its full range of
operation. Re-adjust if necessary.
================
I check my TR4 service manual and in the book itself it doesn't mention the
30 ft.lb first torque step. It sounds like its a fairly important one as well.
Hope this helps someone!
Brad (Lincoln Nebraska 402-464-1502)
My Web Site Http://www.141.com/triumphs (updated 2/15/99)
1964 Spitfire4 BFC25720L
1962 TR4 CT288L -- 1965 TR4 CT38888LO parts car?
1959 TR3A TS41311L -- 1959 TR3A TS53523L parts car
1951 1/2 ton Dodge Truck B-3-B-108
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