An old chestNUT

Finally got round to fitting the new chain on the GFR, and at the same
time the rear sprocket I have had on the shelf awaiting this job.

The GFR has a single sided swing arm with the rear wheel bolted on to a
sort of stub axle by three bolts. The Sprocket is mounted by integral
bosses into a torsion damper. The damper is secured by a castle nut on
to the axle/spindle.

The split pin was a pig to get out as it has probably been undisturbed
for 10 years or more. You guessed it the nut won't come off. A 30mm
socket and two foot breaker bar won't shift it, even with me standing on
the end of it and bouncing up and down. Liberal doses of WD40 have been
applied. A couple of heat and cool cycles with a blow torch have not
worked. I have to be careful getting everything too hot as there are
rubber bushes on the torsion damper plate.

Apart from soaking it in plus gas overnight I am stumped.
Any bright ideas.
An RTFM confirms that it is not a left hand thread (well it doesn't say
it is anyway). The quaint translation from Italian just says "remove
split pin A and nut B." The tightening torque recommendation for the nut
is 60-70 Nm BTW

Another one of those 30 minute jobs that expands in to 48 hours by the
look of it.

--

+-----------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Moto Guzzi Mille GT/Squire RS3 Gilera Nordwest |
| Gilera GFR Moto Morini 2C/375 |
+-----------------------------------------------------------------+

 

Pop out and get that air compressor and rattle gun you've been putting
off buying til now.

Alternatively, fit an old fork tube over the breaker bar and stand on
that...

 

That might help...

.... but using a scaffolding pole would probably do the job.

 

Hmmm. When I changed the gearbox sprocket (not for wear but gearing
reasons) I hired one for a day. Still not certain if that is what
finally sorted that. Must have been a delayed reaction if so because it
was the breaker bar that shifted it in the end.

"Give me a lever long enough ..." . Suppose that's the way to go.
Something's got to give, but I will have to find something a bit more
substantial to lock the wheel/spindle first than the piece of 2 x 2
that's performing that task at the moment.
--

+-----------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Moto Guzzi Mille GT/Squire RS3 Gilera Nordwest |
| Gilera GFR Moto Morini 2C/375 |
+-----------------------------------------------------------------+

 

Depends which way you use the scaffolding pole, dunnit?

I think my rattle gun is defective - it wouldn't undo the 9R's rear axle
nut.

 

Assuming it's not a lefthand thread.

It's *not* a lefthand thread, is it?

 

When we were fighting with the front sprocket on Loz's ZZR, we had Big
Nick on the scaffold pole and Loz on the bike with the brakes applied
hard. The bike moved, so we wedged the front wheel against the dwarf
wall on the patio.

Big Nick multiplied by an eight foot scaffold pole lifted ZZR complete
with Spic horizontally into the air (with me steadying the bike and
socket) a clear two feet before the nut let go with a loud bang. It
was a question of whether the nut was going to release before we ran
out of wall, in the end.

 

Another scaffolding pole.

What? You don't have *two* scaffolding poles? What are you, some kind of
pikey?

 

That's fairly close to what Loz was screaming as he went up in the
world.

Sufficient to bend an eight-foot-long standard scaffold pole from
horizontal at a foot off the deck through a curve above Nick's head at
about seven feet, when the nut would have been three feet above the
ground.

300 kilograms times 2.5 metres, say. Lots.

 

Wouldn't it be 750Nm?

 

Out by an order of magnitude according to
http://www.reell.com/calculator.htm which gives a figure of 73575 N-m
which I find a little high, tbh. Big Nick is a fucking monster, but
that sort of figure is inhuman.

 

300 kg, Christ, Big Nick is REALLY big

 

He is, he's a monster. He started doing Judo at age 10 and moved into
all sorts of other martial arts disciplines. He now teaches at two or
three clubs, being 2nd or 3rd Dan in several forms (judo, ju-jitsu,
thai boxing, kickboxing ...). He trains every day and punches a heavy
bag to the point of having to sit down twice a day - then he times
himself until his pulse rate returns to normal and does it again. And
again. He's had several no holds barred cgae fights and won them all,
despite being twice the age of his opponents.

He's nearly six foot six and 22 stone and there's not much fat on the
old slaphead - his biceps are the same size as my thighs. We went to
the same gym on one memorable evening and I watched him doing lat
pulls (bar down from overhead to touch the back of the neck while
kneeling) with the pin pulled out, so he was doing the entire stack of
weights.

After 20 reps he stood up and I took his place. He wanted to put the
pin in for me, but I stopped him ... I couldn't fucking move it, and
I'm not that weak. I was doing chin-ups on the bar 'cos the weights
wouldn't move an inch. That means he'd pulled more than 13 stones
down onto the back of his neck, 20 times, without raising a sweat.

He's a fucking monster I tell you - and one of the very nicest guys
you could ever hope to meet.

 

Pip wrote:
snip story

22 stone is nearer 300lbs than 300kg but . .

That reminds me of a mate of mine who was a 2nd dan black belt at judo.
He was cycling home late one night when a bloke jumped out in front of
him and pushed Mike off his bike.

He picked the bloke up and threw him to the ground, got back on his bike
and started to cycle away. Unfortunately he was in a high gear and
didn't get going very quickly.

His attacker got up, and chased after him, quicky catching and pushing
him off again. Mike was getting a bit annoyed. He picked the bloke up
again and in his words "threw him down really hard".

He said later that he didn't know what to do next as by that time he
would have won the competition and the thought of giving the bloke a
good kick didn't enter his head. So he got back on his bike and cycled home.

Gentle giants eh?

 

Well I assume the Workshop Manual would mention it if it was.
The section on the clutch specifically mentions the left hand thread on
the nut holding the clutch hub.

--

+-----------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Moto Guzzi Mille GT/Squire RS3 Gilera Nordwest |
| Gilera GFR Moto Morini 2C/375 |
+-----------------------------------------------------------------+

 

As the GFR only weighs around 130 Kgs, even a weakling like me can
achieve that with just the aid of a breaker bar.

A feel a googling session is in order.

To add insult to injury I thought I would cut the chain to size while I
waited for the penetrating fluid to seep in. My beautiful precision
chain rivet extractor that I thought I had been carrying around in the
hill climb tools/parts crate has gone walkabout. I know - angle grinder.

--

+-----------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Moto Guzzi Mille GT/Squire RS3 Gilera Nordwest |
| Gilera GFR Moto Morini 2C/375 |
+-----------------------------------------------------------------+

 

Rattle gun...seriously. If the weedy diy type don't work, take it down
to a tyre fitting place and use their 3/4" drive jobby.

 

Big Nick Patio Wall FrontWheel Front Spkt RearWheel

You mean the bike was pivoting round the front wheel?

If so, all he was doing was applying lift until the nut broke free, the
bike was pivoting round the front axle and the effective lever length
was much less than it appeared.

Or was it like this?

PatioWallFrontWheel FtSpkt RearWheel Big Nick

Where he was applying upward force? If so, and he was lifting the bike
from the back with the scaffold pole, again, if the bike wasn't
anchored, all he was doing was using part of the weight of the bike to
undo the nut. Again, it wasn't as huge a force as it appeared at first.

Still bloody impressive, though.

 

<cough>

http://groups.google.com/group/uk.r...cles+author:Pip&rnum=1&hl=en#07b3e8a1dbba278f

One day I'll find out how to reduce these urls.

 

<creased up with paroxysms of laughter>

Reminds me of all the old new apprentice jokes:

Go to the stores and get me a box of 1/2 inch holes, bucket of sparks
for the grinding machine, can of striped paint ....etc. etc.


--

+-----------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Moto Guzzi Mille GT/Squire RS3 Gilera Nordwest |
| Gilera GFR Moto Morini 2C/375 |
+-----------------------------------------------------------------+