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Extract from March's Octagon Car Club Bulletin
QA Technical Torque
March has come around again which means that much of this column is devoted
to the Index for 1997 complied by Bob Snowden, thanks again Bob. In
addition to the Questions there is also one of Neil Cairns' engine articles
which was originally scheduled to appear in the January issue but has been
delayed because of pressure on space. I have also included one Technical
Comment from Brian King, a former railway engineer, a potential
safety issue which John had to hold back from the February issue.
Co-incidentally, Ernie Smith's, piece on axle repair appeared in the
March issue last year. The March issue has usually been restricted to the
index plus questions; its expansion to fill the available space is a very
good sign because it means that both John and I are receiving plenty
of material from you. There's still no room for compalcency, however, so
keep up the good work and keep sending your technical questions, answers,
tips and comments to:
Malcolm Taylor, Whisket Green, 56 Daisy Lea Lane, Huddersfield. HD3 3LL.
We used to get a great deal of advice on SU carbs from the late Don
Jackson but we do not appear to have had much information on SU fuel pumps.
I am considering fitting an electronic implant to the pump on my 1949 TC.
The implant manufacturers suggest that it would be better if fitted to the
AUA66 instead of the AUA25 fitted to the TC. Does anyone know why? The only
apparent difference between the two types is the outlet union and the fact
that the AUA66 has a 4BA earth screw in the coil housing. Presumably there
is a technical difference between the two pumps. What is it? There are 5
different pump diaphragms, why? Is any member able to write an article on
SU fuel pumps, giving their history and the reason for the changes?
Don Spurr, Portishead, Bristol.
We use our TF most days; for shopping, going to the post etcetera.
Recently someone whose parents were presumably unmarried tried to steal it.
Fortunately they failed. Does anyone have any advice on how to thief-proof
such a car? Our concern is that the thwarted thief may take his frustration
out on the vehicle and I want to prevent this.
Robert Marshall, Bath.
Is the starting handle crank chrome plated on a TC?
John Libbert, Milford, Ohio, USA.
The hinges on the bottom seat slides on my TC are in need of repair by
welding the two halves back together. Are the hinges straight when attached
to the floor or is there an angle to provide clearance for the chrome handle
of the adjustment lever?
It appears that if they are straight the handle would interfere with the
hinge. What type of plating do the slides have?
John Libbert, Milford, Ohio, USA.
Why are the T-type brake drums retained by slim 'half nuts' which strip
so easily? I have fitted full size nuts to mine with no apparent detriment.
Placing "Blue-Tac" on them before fitting the wheel proves that there is
Ian Thomson, Newark, Notts.
The windscreen wipers on my J2 miss the screen and are useless. In
addition, my regular passenger dislikes the presence of the wiper motor on
the screen. Am I legally required to have wipers? I'd like to remove them,
Bob Snowden, Exeter, Devon.
I have recently purchased a 1939 TA which I believe should have a
central lubrication system. Apart from the brackets attached to the
bulkhead, I have no other clues as to the rest of the system. Can someone
please advise me as to the size of the pipes required and/or necessary
fixings to the handbrake cable, springs and bulkheads brackets. A guide to
the correct route of the pipes would be helpful and as would any advice on
where to purchase all the necessary parts. Is it a worthwhile exercise or is
it better to leave well alone and grease the nipples directly?
John Patman - Epsom, Surrey.
I have a late TD (Chassis TD24545) which was repatriated from the U.S.A.
Someone has converted it to RHD leaving the original pedal box in situ. In
the base of the box is what looks like some kind of stop, cylindrical in
shape and mounted so that it can be adjusted fore and aft. The new box has a
similar slot in the base but nothing fitted. Should the stop be moved to the
new RHD box and what is the adjustment? I have searched the Workshop Manual
and various Parts Catalogues but cannot trace it.
Ernie Evans, Derwen, Corwen.
Has anyone fitted lap/diagonal seat belts to a TF or TD? The obvious
anchorages are the side of the transmission tunnel, the floor and the top of
the wheel arch. Who was the supplier, what size backing plates were used and
were they welded? Any problems and exact locations would be helpful. I know
kits are available for Midgets & MGB etc but these cars have factory fitted
Brian Archer, Bath.
Tips and Comments
Stub Axle Repair
The repair described by Phil Marino in the December Bulletin was of great
interest to me - a retired railway engineer - as the principles involved are
those used when fitting railway wheels and axles together. Two aspects need
(i) Fretting is a risk where the axle exits the yoke at the bearing end of
the force fit. Time will tell if the proportions of the design are adequate.
(ii) The photograph of the axle appeared to show a very sharp radius where
the axle exits the yoke on the bearing side. The combination of high bending
moments, axial force and a sharp radius may be undesirable. Notches or
scratches in this area could raise stresses by factors approaching x10. Is
there scope for a much larger radius? A form tool and a 'water' finish would
be good practice.
Brian L. King, Quarndon, Derby.
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