Help Identify BB 'Clunking' Noise Please!

John Latter said:

The latest problem (which I hope you can help me with) is
a distinct 'clunking' sound which happens in all gears and
is mostly associated with any pressure on the right hand
pedal (where the three chain thingies are) when it is at
the top of its 'orbit'.

There are lots of things it could be including a loose
pedal, the crank loose on the bottom bracket spindle or a
loose bottom bracket. Try tightening them all up and see if
it goes away. FWIW I would spend the £15 to get a Shimano
UN52 bottom bracket fitted if you currently have a component
one - the Shimano ones are fit and forget.

Tony

John Latter said:

(apparently the bb mechanism consists of component parts
which is the old way of doing things).

Yup, that's right. Mine's the same.

Quoted message said:

Er, I'm not very knowledgeable about bikes, nor very good
at describing symptoms, but I hope the foregoing may make
some sense to somebody!

I'm no expert either, but... Is the crank loose where it
attaches to the BB axle? If not, then I'd guess it most
probably is another bearing problem. Or it could be the
axle that's worn, especially if you had the bearings
replaced recently.

Quoted message said:

I also hope its easy for someone like me to sort out 🙂

I think fixing it is one of those jobs that is not all that
difficult but requires some fairly specialised tools -
namely a 'C' spanner, for removing the bracket locking nuts,
and a crank extractor for, er, extracting the cranks.

d.

On Sun, 28 Mar 2004 16:18:48 +0100, "Tony Raven"
<[email hidden]> wrote in message
<[email hidden]>:

Quoted message said:

FWIW I would spend the £15 to get a Shimano UN52 bottom
bracket fitted if you currently have a component one - the
Shimano ones are fit and forget.

The UN72 might be, but I wore out a UN52 in under a year.

--
Guy
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"david kenning" <[email hidden]> wrote in message
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Quoted message said:

John Latter said:

(apparently the bb mechanism consists of component parts
which is the old way of doing things).

Yup, that's right. Mine's the same.

Quoted message said:

Er, I'm not very knowledgeable about bikes, nor very
good at describing symptoms, but I hope the foregoing
may make some sense to somebody!

I'm no expert either, but... Is the crank loose where it
attaches to the

BB

Quoted message said:

axle? If not, then I'd guess it most probably is another
bearing problem.

Or

Quoted message said:

it could be the axle that's worn, especially if you had
the bearings replaced recently.

Quoted message said:

I also hope its easy for someone like me to sort out 🙂

I think fixing it is one of those jobs that is not all
that difficult but requires some fairly specialised tools
- namely a 'C' spanner, for

removing

Quoted message said:

the bracket locking nuts, and a crank extractor for, er,
extracting the cranks.

d.

It's *far* more likely to be a crank problem. You'll just
need a crank bolt spanner (14mm recessed socket, usually) or
allen key (8mm usually) if this is the case. It should just
need to be tightened. Sometimes removing the cranks and
turning through 90 degrees also helps, but for this you'll
need a crank extractor. Take the bike to a good shop and ask
them which tools you need if you're not sure - if you get
someone helpful they might also help with your prognosis.

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On Sun, 28 Mar 2004 16:11:04 +0100, John Latter <[email hidden]>

Quoted message said:

Hi,

I brought an Argos 'Boss Reflex' cycle for £129 in November
which I exchanged (for the same model) two weeks ago
because of bottom bracket bearing problems.

Now the new bike is playing up! First I got side-to-side
play from the cranks which a friendly Halfords engineer
sorted out for me (apparently the bb mechanism consists of
component parts which is the old way of doing things).

The latest problem (which I hope you can help me with) is a
distinct 'clunking' sound which happens in all gears and is
mostly associated with any pressure on the right hand pedal
(where the three chain thingies are) when it is at the top
of its 'orbit'.

Er, I'm not very knowledgeable about bikes, nor very good
at describing symptoms, but I hope the foregoing may make
some sense to somebody!

I also hope its easy for someone like me to sort out 🙂

Thankyou to everyone who replied & for the info!

I'm going to try & see if Argos will allow me to swap it for
a more expensive model (seeing as this is the second one of
this type I've had & this one is only 2 weeks old) - and pay
the difference of course
🙁

An engineer at Halfords did tighten everything up around the
bottom bracket (including the crank bolts) last monday. If
Argos don't allow an upgrade then I guess I'll have to pay
for a shimano thingy (£15 + £8 labour). Seems a bit much
though considering how new the bike is!

Thanks again,

--

John Latter

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John Latter said:

An engineer at Halfords did tighten everything up around
the bottom bracket (including the crank bolts) last
monday. If Argos don't allow an upgrade then I guess I'll
have to pay for a shimano thingy (£15 + £8 labour). Seems
a bit much though considering how new the bike is!

Its likely the next one up will also have the same bottom
bracket. Its a place that manufacturers can save money
without it being immediately obvious to the buyer. If you
like the bike generally I would suggest changing the bottom
bracket. The type you have is notorious to keep set up while
the Shimano is a sealed unit that works until it stops
working then you throw it away and put in another. If you
talk nicely to the shop you have a good chance of having the
labour waived.

Tony

Just zis Guy said:

The UN72 might be, but I wore out a UN52 in under a year.

I've found them pretty reliable - it must be that strange
position you have yours in up front rather than in its
proper place down below ;-)

Tony

On Sun, 28 Mar 2004 19:08:27 +0100, "Tony Raven"
<[email hidden]> wrote in message
<[email hidden]>:

Quoted message said:

Quoted message said:

The UN72 might be, but I wore out a UN52 in under a year.

Quoted message said:

I've found them pretty reliable - it must be that strange
position you have yours in up front rather than in its
proper place down below ;-)

'Twas on the wedgie, tho. The 'bent has a UN72 as standard.

--
Guy
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