workshop
tips
the fto and the mot ..
Please note that this is not intended to be a detailed analysis of
the MOT test, but more a list of potential problems areas specific to the FTO,
and what you can do to minimise the inconvenience and expense of your car
failing the annual test.
The following information is based on over 30 years in the motor trade and 10
years experience with FTOs. This advice should help you make a more informed decision
regarding parts purchase and may also be useful for any DIY'ers out there.
suspension and
steering..
Front suspension:
The most
regular MOT failure items connected with suspension and steering are excessive
wear to the front anti roll bar drop links. Except for the version R, all
FTOs use the same front drop link. These are the rods with a ball joint on each
end that connects the anti roll bar to the front strut or suspension leg.
Fortunately these links are no longer an expensive item and are quite easy to
replace. All you need is a couple of 14mm spanners and possibly an allen key.
They can be a bit of a pain if the threads are corroded, but a bit of action
with a wire brush and releasing oil should do the trick. Whilst you are under there,
check the D shaped rubber bushes that hold the anti roll bar to the main cross member.
Excessive movement in these bushes will also be a fail. Superflex poly
replacements are as cheap as chips, but the problem is actually getting at them.
The clamps, one on each side, fastened by a single 12mm headed bolt, are tucked
away between the cross member and floor pan. At least the bushes themselves are
of the split variety, to allow easy assembly to the bar.
Offside front suspension
assembly showing lower wishbone with ball joint to right.
Also in view is a section of the track rod with track rod endattached to the
steering arm.
The black bar in
the centre is the anti roll bar and bottom of drop link attached to it.
Next
up in the MOT failure stakes would be the front lower wishbone, or as it
is sometimes known in more adolescent circles, the front bottom arm. This arm is
bushed at the two chassis pivot points and attaches to the front hub via a ball
joint. It is this outer ball joint that wears and unfortunately it cannot be
replaced separately, so you will need to buy a complete bottom arm assembly. You can check
for play in this ball joint by getting a front wheel off the ground - don't
forget the axle stands - and by grabbing the top and bottom of the wheel and tyre
giving it a good tug - you are trying to get the wheel to move top in and bottom
out and vice versa. It's not the easiest job to detect very slight play, but any
significant movement means a test fail and replacement. You may get confused if
there is also excessive play in the front wheel bearing, but if the play magically disappears
when a handy assistant presses the brake pedal, then it's almost certainly worn wheel bearings and not the ball joint.
Whilst you are ferreting around under the wheel arch, have a look at the front
strut and coil spring. On highish mileage FTOs leaky front struts via the
seal where the piston rod enters the body of the strut are a regular MOT fail.
You will need to lift the dust cover or gaiter to have a good look. A small
patch of damp may be ok, but an obvious leak is an MOT no-no. Have a look at
the coil spring and make sure it is still in one piece. Give the spring a tap
with a small hammer or chisel and if all is well you should hear a clear springy
boing sound. A duller metallic sound may indicate a a broken spring.
Please note that if you need to take a front strut assembly apart, the coil
spring is fitted under compression and you will need a proper coil spring
compressor and knowledge of how to use it safely. Failure to observe this
warning could take your face off.
Now that we've all had some experience of wheel jiggling, we can get some more
practice by checking play in the steering rack. Place your hands at quarter to
three, or quarter past nine if you are working late, and try to wiggle the wheel
and tyre side to side with short sharp movements. Put a bit of effort in and if you can feel a any play it
could be either the ball joint on track rod located under the steering rack
gaiter or the track rod end. The track rods are the two rods sticking out
of either side of the steering rack and they fasten to the steering arms on the front
hubs via ball joint thingys called track rod ends. You will need a helper to investigate further. Get
him/her to jiggle the wheel while you grab the track rod end. If you can feel movement
in the pin, possibly accompanied by a click or light knock, with your hand then hey presto it's the track rod
end. If not, then squeeze the rack gaiter until you can feel the track rod
underneath again whilst your assistant jiggles the wheel. If you can feel play under
the gaiter nearest to the body of the rack, then Bob's your uncle - it's
probably the ball joint at the inner end of track rod itself. Both jobs are straightforward enough, but unless you are
pretty experienced and competent, steering repairs are probably best left
to professionals, who will also have the specialist gear to check the front
wheel alignment - an essential task if the steering or suspension has been
disturbed.
Rear suspension: Again the most common MOT failure is worn anti roll bar drop links. This is the link that joins the anti roll bar to the lower lateral suspension arm. The GR and GS versions have a different arrangement to GPX, version R and GX models. On the former you will find separate long bolts with 4 rubber bushes per side. The bolts corrode and the rubber bushes deteriorate. The best bet is to replace the whole lot with a kit containing stainless steel bolts, washers and Superflex poly bushes. On the other models a similar but shorter version of the front drop link is used, with a ball joint at either end. Please note that with both arrangements, shorter versions are available to suit lowered suspension and you should specify this when ordering. Once again, like the front, the D bushes that locate the anti roll bar are prone to perishing which allows the bar to move about. Uprated Superflex bushes are available for not much money and are easily replaced. The GR and GS models have a 17mm diameter bar fitted and other models have the 18mm version, and you will need to mention this when ordering.
Offside rear suspension
assembly showing lower transverse arm as it attaches to the main trailing arm,
rear shocker assembly and to the left, the GPX style anti roll bar and drop link
Other areas to check on each side are the bushes in the main trailing arm,
lateral lower arm and the two locating links, or dog's bones as they are
sometimes called. Best way to do this is to get the back of the car securely off
the ground using axle stands. Dive underneath with a tyre lever or man-sized
screw driver and have a bit rake about. You will get some play in the trailing
arm front bush, but a degree of movement is built in. Superflex do an uprated trailing arm
front bush and it is competitively priced compared to
the standard part. Any other noticeable play in other bushes or links shouldn't
be there and could well herald an MOT test fail. Other bushes are replaceable
except for the upper and lower links (dog's bones) which need to be replaced as
a unit. The bottom bush in the rear shocker doesn't seem prone to wear but, as
per the front suspension, check for leaks on the shocker and broken coil
springs. You can check for play in the rear wheel bearings by following the
front wheel guidelines above. Having said that, I've heard rear wheel bearings
make a right racket on the road, without any obvious signs of play once jacked
up. Wheel bearings are not separately replaceable and you will need to change
the complete, and expensive, hub assembly.
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IMPORTANT
Although we
have been very careful in the compilation of the advice pages of our website and
the content is thoroughly checked by our panel of specialists,
we cannot be held responsible for any loss or damage caused if
you decide to follow the advice contained herein.
Please bear in
mind that a job which may well be a piece of p*ss on a vehicle lift, could
easily turn into a total nightmare when lying on your back in the regulation
puddle. Don't tackle
any work unless you are confident that you fully understand the complexity of
the job you are undertaking. Make sure that you have the correct tools, always
wear the appropriate protection and
never, ever work under an unsupported vehicle. If
you are not confident that you can complete the job, then it should be entrusted
to a specialist.
If you
feel that there are any errors on any aspect of this page, or you simply wish to comment, please call Malcolm on
0191 586 7724
or you can
email us here
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