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Well, I replaced my clutch over the weekend, and I thought I'd
share some things with you.
1. Symptoms. Drive along a level road at about 3000rpm in 4th
or 5th, and put your foot down. If the engine revs rise and your
speed doesn't (in proportion), your clutch is slipping and should
be replaced PDQ. Another symptom is that the take up point will
be very high - so if you can lift your foot a long way without
the drive taking up, beware. Note that the clutch is adjustable,
with a rod/locknut behind the top of the pedal. My clutch disc
was worn to the point of one rivet each side just taking a polish
- any more and the flywheel face could have been damaged. "Just
in time" comes to mind!
2. Doing it yourself on your drive. Basic advice - DON'T. Actually
removing and replacing the gearbox is a serious undertaking. Find
a competent Mazda specialist who has done MX-5's before (see techy
bit below for why). Not necessarily a Mazda dealer - few Mazdas
are serviced by dealers after 3 years, and few clutches are replaced
in that time. My local parts man in a very large dealership said
he had only bought one clutch in the last two years, and that
was for an RX-7 and it wasn't needed (just adjustment) so it 's
still on the shelf. But this month he's bought three - mine and
two 323 clutches. Like buses..
3. If you are still determined to do it yourself, negotiate the
price. Current quoted prices - Powertrain - 85 + VAT. Blueprint
- 115 + VAT. Mazda - 135 + VAT. I fancied the pukka thing, so
I said "Look, I can buy a clutch for X. If you can do it all-in
(disc, cover and release bearing) for Y I'll have it from you."
They accepted. I paid more than the cost of a Powertrain one,
but rather less than the cost of a Blueprint one for a Mazda clutch.
Expect your local dealers to be rebadged "Souk" shortly! :-)
4. Having known for many years that Mazda source spare parts
in Europe, I was only a little surprised to find my "Mazda" clutch
labelled "Valeo". Aren 't they French? Perhaps I should have got
the Powertrain one. Anyway the replacement was completely different
from the old one.
5. Minimum requirements - first and most important - proper support
for the car. You need it high and secure. I had the front wheels
on ramps and the back sills on axle stands. It was OK, but I was
unable to get the gearbox out from under the car. A bit inconvenient
cleaning the bell housing and replacing the release bearing under
there! Next, you need an excellent toolkit with wide choice of
sockets, extensions, flexible joints, ratchet ring spanners, a
proven method of supporting the gearbox during removal and replacement
and a competent assistant. The gearbox is very big and very heavy
(120 lbs ish?), and you're manoeuvring it in a very confined space.
If it slips, it may injure you or damage itself or your car.
6. You need a workshop manual, but be careful. Both the Haynes
manual and the official workshop manual are plain wrong describing
the removal sequence of the PPF (the what? Power Plant Frame or
Torque tube - basically a girder - ties the gearbox and differential
together into a rigid assembly. If you fell over one in the street
you'd swear it was a vital structural component of the Forth Bridge
rather than part of a sports car). The problem is in separation
of the PPF from the differential. Haynes manual, Chapter 7A, Section
5, item 7 - says "Remove the differential mounting spacer". Well,
it is impossible to remove the spacer at this point, before the
next step. In fact, it need not be removed at all. The next step
is to "thread a M14 x 1.5 bolt .." This is not an item I had lying
around my garage - it's the sort of thing that might be used to
secure a railway line to a sleeper (I exaggerate). I acquired
one - but it was too short - you need one at least 125mm, and
preferably 150mm long - but you'll find most suppliers only stock
long ones in 2mm pitch - which will not do. I eventually got by
without it - a bit of judicious tapping made the sleeve which
you're trying to extract drop by itself. But if it won't - you
need the bolt. Be warned.
7. I don't think you need to remove the starter motor. It is
very inaccessible, and I suppose you run a slight risk of damaging
it. You do have to remove the rear bolts, but I would leave the
front bracket and electrical connections in place.
8. And finally - BE CAREFUL with the gearbox. You have to wiggle
it past a whole lot of obstructions - and I can't emphasise enough
how big and heavy it seems, and how many handy little spigots
to catch on things it has, when you're lying under the car with
it! (3/00)
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