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'71 T120...strange noise from left side #218674
10/14/08 7:53 am
10/14/08 7:53 am
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
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Paul Burdette  Offline OP
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Joined: Jun 2008
Posts: 197
portland, oregon, USA
so i have the bonnie on the road, and have been loving the riding. i had some clutch issues i posted about in another thread, and they ended up being due to a worn clutch hub that had me suspecting the thrust washer along with the kitchen sink and the pope. anyway, now i have a new few problems, and i'll post them together as they are probably related...

there is a strange repetitive noise under load, too slow to be a wheel or engine noise, but it sounds like it's coming from the primary cover. at 30-50MPH it's probably at about 2 times per second. the only thing i can think that would rotate that slowly would be the drive chain (if there were one offending spot on it), but it is brand new and i can't find any evidence of a problem anywhere.

also, there is play in the rear hub, but after disassembly and inspection i can't find a problem. when mounted, there is play in the hub, evident at the brake backing plate. it seems to me that the bearing beneath it wants to sit a little deeper, but it is sitting firmly in it's land. when the wheel is off and the backing plate installed, should it sit snug, or can it rock around a little bit on the center?

anyway, the noise increases in volume when cornering so i feel they have to be related. any ideas?


1972 Norton Commando Combat
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There's no such thing as the "left side" [Re: Paul Burdette] #218753
10/14/08 4:23 pm
10/14/08 4:23 pm
Joined: Oct 2003
Posts: 11,141
North Georgia, USA
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,141
North Georgia, USA
Paul -
Check the alternator rotor for self-destruction mode. That's the most usual noise from the drive side. You'll need to completely remove the rotor and chuck the steel mounting boss in a vise and twist the exterior with a huge set of pliers to tell if its loose or not.

Reinstall the rotor with blue LocTite 242 on the nut threads while torquing it correctly. If you install the "lock tab" don't even bother bending it up.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: There's no such thing as the "left side" [Re: RF Whatley] #218812
10/14/08 9:55 pm
10/14/08 9:55 pm
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
BritBike Forum member
Paul Burdette  Offline OP
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Joined: Jun 2008
Posts: 197
portland, oregon, USA
thanks RF- i did check this when timing the new ignition, but i'll check again. the strange thing about it though is that it is far slower then the RPM of the engine. i say it sounds like it's coming from the primary cover, but it's pretty hard to locate while riding. doesn't do it while stationary, which tells me it must have something to do with the wheels or drive chain. ?


1972 Norton Commando Combat
Re: There's no such thing as the "left side" [Re: Paul Burdette] #218866
10/15/08 6:06 am
10/15/08 6:06 am
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
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Blapper  Offline
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Kent UK
Paul, You aren't talking about the 'clicking' noise that is common on disc brakes are you? It is caused by the plating wearing through in patches and making the pads 'jiggle' in the calipers. Try gently touching the brakes to see if it changes.

HTH

Blapper redwine

Re: There's no such thing as the "left side" [Re: Blapper] #218905
10/15/08 2:38 pm
10/15/08 2:38 pm
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
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Paul Burdette  Offline OP
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Joined: Jun 2008
Posts: 197
portland, oregon, USA
no disk brakes here. drum front and rear.


1972 Norton Commando Combat
Re: There's no such thing as the "left side" [Re: Paul Burdette] #219426
10/18/08 5:38 pm
10/18/08 5:38 pm
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
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Paul Burdette  Offline OP
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Joined: Jun 2008
Posts: 197
portland, oregon, USA
of, and by the way RF- my manual refers to the left side. no?


1972 Norton Commando Combat
Re: There's no such thing as the "left side" [Re: Paul Burdette] #219438
10/18/08 7:07 pm
10/18/08 7:07 pm
Joined: Oct 2007
Posts: 724
bromley uk
N
norton bob Offline
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norton bob  Offline
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N
Joined: Oct 2007
Posts: 724
bromley uk
Check chain not tight, final chain rubbing gaurd,clutch bearing, alternator clearance,-- cant think anthing else!

Re: There's no such thing as the "left side" [Re: norton bob] #219457
10/18/08 10:05 pm
10/18/08 10:05 pm
Joined: Nov 2004
Posts: 976
palo alto,ca.
A
az-idea Offline
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az-idea  Offline
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A
Joined: Nov 2004
Posts: 976
palo alto,ca.
..could be brake shoe X drum out of round,or misfit anomouly..causeing the periodicity..or"hit"..which causes the backing plate to twitch and sound out against the bearing..?..maybe rear mounted speedo issue too..?..

Re: There's no such thing as the "left side" [Re: az-idea] #219458
10/18/08 10:15 pm
10/18/08 10:15 pm
Joined: Nov 2004
Posts: 976
palo alto,ca.
A
az-idea Offline
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az-idea  Offline
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Joined: Nov 2004
Posts: 976
palo alto,ca.
..[center stand,or jack up rear..does issue appear while spinning rear wheel..?..gently apply rear brake while riding..does issue go away?..indicateing its in the drum\shoe fit..?].."noise"increases when in turns?..this may indicate a bearing in failure...

Re: There's no such thing as the "left side" [Re: az-idea] #219665
10/20/08 5:57 am
10/20/08 5:57 am
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
BritBike Forum member
Paul Burdette  Offline OP
BritBike Forum member
Joined: Jun 2008
Posts: 197
portland, oregon, USA
the sound is usually produced under acceleration, and seems to be louder in cornering. i feel like is has to do with the rear wheel, but i can't figure out what. can anyone confirm how the center of the backing plate is supposed to sit against the wheel bearing/spacer? when i had the wheel off trying to chase down the slop i had found (i thought i had fixed it when i discovered the bearing retainer was loose), i thought that the backing plate didn't seem to sit quite right. it seemed like the bearing wanted to be a little deeper so the backing plate could rest fully, but it was all the way in. is this normal?

the chain is tensioned correctly and is new. there is no visible sign of wear, and the chain guard is not installed.


1972 Norton Commando Combat
Re: There's no such thing as the "left side" [Re: Paul Burdette] #219774
10/20/08 10:18 pm
10/20/08 10:18 pm
Joined: Nov 2004
Posts: 976
palo alto,ca.
A
az-idea Offline
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az-idea  Offline
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A
Joined: Nov 2004
Posts: 976
palo alto,ca.
..Hope im not being a pest..But,trust your Gut!remove that bearing and check spec.against factory manual..at least to resolve the question..I suspect its wrong,and that its failing too,but I offer that hipshot..when not informed on bikes repair?history,running Diary,time Had et cet...but,keep on..youll find it if,when,you dig furthur...looking forward to hearing so...[maybe someone will post spec.on the proper bearing..?..}

Re: There's no such thing as the "left side" [Re: az-idea] #220206
10/23/08 1:34 am
10/23/08 1:34 am
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
BritBike Forum member
Paul Burdette  Offline OP
BritBike Forum member
Joined: Jun 2008
Posts: 197
portland, oregon, USA
i couldn't find a spec... the plan is to replace both bearings with sealed items, but in the meantime i may remove the rear wheel on my A65 for comparison.


1972 Norton Commando Combat
Re: There's no such thing as the "left side" [Re: Paul Burdette] #220226
10/23/08 3:52 am
10/23/08 3:52 am
Joined: Dec 2006
Posts: 3,878
Massachusetts, U.S.A.
B
btour Online content
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btour  Online Content
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B
Joined: Dec 2006
Posts: 3,878
Massachusetts, U.S.A.
Again, check the kickstarter, hold it up high with foot or use a bungie. I had the same thing. sound was louder under accel and round a corner.


Bob, Lifetime bike: '71 T120R, bought in '71 at Ken Heanes, England.
Re: There's no such thing as the "left side" [Re: Paul Burdette] #220342
10/23/08 6:09 pm
10/23/08 6:09 pm
Joined: Jun 2006
Posts: 60
chino hills, california
A
azkar t140e Offline
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azkar t140e  Offline
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A
Joined: Jun 2006
Posts: 60
chino hills, california
Hi Paul,

It might be the primary chain tensioner. I have a '79 T 140. It's not the same bike, but I heard a ticking noise kind of like yours on the primary. The sound never appeared revving the bike up in stationary. I thought of the worst possible o

Re: There's no such thing as the "left side" [Re: Paul Burdette] #220344
10/23/08 6:09 pm
10/23/08 6:09 pm
Joined: Jun 2006
Posts: 60
chino hills, california
A
azkar t140e Offline
BritBike Forum member
azkar t140e  Offline
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A
Joined: Jun 2006
Posts: 60
chino hills, california
Hi Paul,

It might be the primary chain tensioner. I have a '79 T 140. It's not the same bike, but I heard a ticking noise kind of like yours on the primary. The sound never appeared revving the bike up in stationary. I thought of the worst possible outcomes. Like you, I installed a bran new primary chain and the tensioner was completely relaxed as the chain was quite tight. That's was the noise I heard under acceleration or when changing gears down: the tensioner's screw being loose. I tightened up the long screw that bend the tensioner enough to be tight without stressing the chain. In my case the rattling was gone. You may check that before thinking of more dramatic outcomes.

Azkar

Re: There's no such thing as the "left side" [Re: azkar t140e] #220418
10/24/08 5:09 am
10/24/08 5:09 am
Joined: Jun 2008
Posts: 197
portland, oregon, USA
Paul Burdette Offline OP
BritBike Forum member
Paul Burdette  Offline OP
BritBike Forum member
Joined: Jun 2008
Posts: 197
portland, oregon, USA
thanks for the advice- i'll check that again for sure...haven't had a chance to get back at it for a few days.


1972 Norton Commando Combat

Moderated by  John Healy 


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