link failure on an MGBGTV8
Alan McLean launched a V8BB
thread saying "the drop link on the driver's side of my V8 snapped clean
off at the joint were the rod meets the U shaped bracket. I have ordered a replacement
pair which should arrive before the weekend. My question is, I seem to remember
reading an article somewhere about this as been a known weak point on the drop
link and that some additional welding around this joint solves the issue. Does
anyone know of this?" He later added "my concern was that with having
a beefier anti roll bar fitted (7/8") that it was putting more pressure on
the drop link and that's what caused it to snap off."
responded "Ive had a 7/8 ARB for the last ten years or so [on
my V8 Roadster] and while the drop links are adjustable with rose joints the U
shaped end is as standard and has never been a problem. Having said that the weld
looks virtually non-existent and is possibly a friction welded during manufacture.
They are Part Nos. AHH6543A
Bill McCullough added "I experienced the same problem on one occasion,
but the failure occurred within five miles of the links installation, I presumed
it was an isolated example of bad welding. I
rewelded the offending link by disconnecting it at the anti roll bar and swivelling
it down to provide access for a MIG welder - don't forget to disconnect your battery
if you adopt this approach, electric welders can 'severely damage your cars electrics'
if the battery remains connected during the welding."
Wotherspoon then highlighted that "Moss mention [on their website] about
putting an extra weld on the drop links when you look into the item description.
But to me surely you would just manufacture the item correctly in the first place?"
The link to the Moss
webpage was found - the text on that webpage is:
is recommended that the joint between the upper link and main stem should be strengthened
with weld on the standard links. Full competition cars can use rose-jointed links;
these are easily adjustable on the car to allow last-minute tuning.
Victor Smith added "looking at the webpage with the link [provided
by Geoff King], is Moss indicating that for an MGBGT and MGBGTV8 the "LINK,
Outer, Competition/Rose Jointed" item is their replacement part?" See
an extract from their webpage below.
Geoff King responded "MGS30791
is an alternative and interchangeable replacement for the standard AHH6543A/AHH6544A.
It is similar but not identical to the drop links I have it on my car as part
of the John Hoyle tubular double wishbone coil over damper front suspension."
He added "I wonder
if there is anyone with an RV8 willing to share the details of the drop link fitted
to their car. I know it is different to the MGB/V8 but the suspension is very
similar and it would be interesting to see what MGRover changed."
then sent a couple of photos of his damaged drop link to the V8 Webmaster which
are included on the first of the documents below.
Hesketh-Jones reported a few weeks later he had ordered a pair of RV8 drop
links and had successfullu fitted them to his MGBGTV8. His note was "as a
high-mileage MGBGTV8 user I become paranoid when I hear about basic parts involved
in safety failing in service without giving any prior warning - for example as
soon as the reports started coming about brake servo failures some years ago,
I had a brand new one fitted together with all new pipes for the brake fluid.
The recent failure of a drop link on a factory V8GT reported in the V8
Bulletin Board was scary, so Ron Gammons' comments stating that the basic
RV8 version was far sturdier and stronger but that the fixing the dimensions were
virtually identical to those of the MGBV8GT, convinced me to go ahead.
Interestingly, none of the usual MG suppliers had the RV8 version available, but
B&G had them in stock and they arrived here in Cornwall quite quickly. Fitting
was quite easy - except for the fact that one of the original drop links could
not be extracted from the new spring pan (fitted just five years ago), so the
pan had to be removed and introduced to an oxy-acetylene torch. After fitting
the track was re-checked and there had been no change. To be fair, the original
drop-links fitted by Abingdon had lasted for 420K miles and showed no visible
signs of cracking, but you can't be too careful!" So confirmation they can
information see the five documents available on the V8 Website via the
Drop link on an MGBGTV8
Extract from the MGB
Workshop Manual AKD3259 showing the anti-roll bar link together with the photos
provided by Alan McLean. More
Comparison of two drop links
Additional photos from Alan McLean who says the "drop links
were ordered as a set (left and right) from the same supplier but as I said in
my posting on the V8BB they are like chalk and cheese as regards quality and finish
as you can plainly see." More
Drop link on an RV8
Extracts from the RV8 Repair Manual AKM7153ENG
and the RV8 Parts Manual showing the anti-roll bar link on an RV8. More
MGBGTV8 and RV8 drop links compared
Photos and a note from Ron
Broken drop link removed from the car
McLean shows the fracture. More