Check your plastic breather pipe is not missing and
replace with a brass unit
Squires highlights a check worth making on your RV8 back axle. (Dec
Derek said "went into my garage a couple of weeks ago and
saw something lying on the floor under the back of the RV8. Turned out to be the
plastic rear axle breather (19), which had sheared off at the top of the
short threaded section that holds it into the axle, and so I now have an open
hole of about 7mm diameter in the top of the axle to let in water and grit! Readily
obtainable, but if it had fallen off on the road, I'd never have noticed that
it was missing. My RV8-owner friend here in southern Spain has just crawled under
his car, and found his is missing as well. Might be worth a check that you still
have one on your RV8! You can find it on top of the axle, right-hand side, just
outboard of the differential".
Derek Squires later posted a
note saying "further to my previous post concerning the RV8 rear axle breathers,
I've just fitted a correct replacement (ZKC5726) from Brown & Gammons.
This is about 6mm shorter/lower than the (MGB) breather that was on my car, as
it doesn't have the unthreaded narrow section, and it has a small ball-bearing
inside the cap to act as a non-return, which the old one didn't have - although
it may just have been missing. So I can confirm that the RV8 breather is slightly
different to the 21H6060 for the MGB which is illustrated on the B &
G website. An article was released on the V8 website in early January 2016.
months later the V8BB thread came alive again when Tim Smith said "noting
a recent article on the RV8 back axle breather pipe I have checked mine and found
nothing except the hole! Looking on Brown and Gammons' website the product is
now no longer available. Does anyone know: an alternative supplier, the thread
in the axle and of a homemade alternative?" He later reported "I have
found one on eBay for an MGB which I will purchase and check out. I would think
that if the threads are the same as a brass breather for a Land Rover that would
be a lot better".
Dave Morris responded "the RV8 axle
is a Salisbury 12HA I believe, very similar to the 9HA used on Land Rovers as
you say. The off-roaders use nice little aluminium breathers with one way valves
or tubes attached to prevent water ingress. Worth a look as an alternative to
the original plastic part".
Richard Withington with an RV8 and MGBGTV8 noted "I am
also looking for one of these breathers as it looks like they all
fall out! The rear axle is
Comparison of a replacement plastic breather
brass breather valve as
fitted to Land Rover back axles. On inspection the
quality of the plastic part was not very good.
Brass breather fitted to an RV8 back axle
a 9HA casing so on checking Rimmers Bros
website I note that they have a part 21H6060 for £3.10
which looks very similar, there is also a brass alternative.
I will buy one next time I go to Rimmers but if anyone has tried it
I would be interested to know
what they found".
They are also available from Brown & Gammons.
Jonathan Buckley then contributed some useful information on
his experience saying "after reading the article by Derek Squires
on his losing a rear axle breather, and in view of the above similar
experiences by some of our other members, I decided to have a look
at mine and not surprisingly the plastic breather tube had sheared-off
and was missing. As the correct MG RV8 part (ZKC5726) seems
to be NLA, I ordered the equivalent part to fit an MGB
(21H6060) with the same thread. When this arrived, I was rather
disappointed with the poor quality of the plastic part, and was convinced
that it would soon go the way of the previous breather tube fitted
on my car. I therefore looked around for a better quality metal breather
tube that would hopefully fit the same hole and thread.
found that Land Rover Defender/Range Rover (LR) use a similar rear
axle breather (515845), but of better
quality in brass, and incorporating a ball-type non-return valve to
exclude water and dirt. These breather
valves are widely available from LR dealers,and
on a well-known auction site, generally for
than £5. The thread size is 1/8
removed what remained of the plastic breather tube in the axle via
the battery compartment opening using a sharp knife as recommended,
and then fitted the new Land Rover breather valve. Attached is a photo
of the brass breather valve fitted in place in the rear axle. I think
you will agree this alternative breather valve provides a more substantial
and better-designed part than the plastic MG RV8 and MGB versions.
It should hopefully be a fit and forget replacement. I
also hope this response provides some of the information requested
in the above other members queries, and a useful alternative
breather tube for those who have yet to check if it is missing from
their car's rear axle, and would prefer to fit a suitable replacement".
Buckley later sent in a pair of photos and noted "I
believe the only risk with fitting the brass Land Rover breather valve
is that the ball in the valve can become 'stuck', as has been reported
on some Land Rover chat sites, however, bearing in mind the difference
in conditions around the back axle with an off-road Land Rover and
the conditions an MG is likely to experience, I am personally not
too concerned about this. The benefits it provides in normal operation
will be useful".
our later note on thread compatibility with replacement back
axle breathers. See
See larger photos of the breather
comparison and the brass brass
Brass back axle breathers are available from Brown & Gammons.