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Clutch Push Rod #388560
08/09/11 1:05 am
08/09/11 1:05 am
Joined: Jul 2011
Posts: 37
Massachusetts, USA
J
Jim Winning Offline OP
BritBike Forum member
Jim Winning  Offline OP
BritBike Forum member
J

Joined: Jul 2011
Posts: 37
Massachusetts, USA
Anybody know what the length of the clutch push rod in a 1969 A65 should be? My clutch was at the limits of its adjustment at both the lever and the pressure plate so I have replaced the cable, clutch plates and the push rod which looked worn. The existing rod is 11" long and the replacement is 11-13/16". While the old rod appears to be too short the new rod appears to be too long.

Should I grind the new one down to the correct length? Suggestions?
Thanks,
Jim


1972 750 Commando
1972 750 Commando Fastback
1974 850 Commando
1967 Matchless G15
1967 Norton P11 (Project)
1974 T150V
1970 T120R
1970 TR6 (UK)
1970 T100C
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Re: Clutch Push Rod [Re: Jim Winning] #388577
08/09/11 2:57 am
08/09/11 2:57 am
Joined: Jan 2006
Posts: 1,979
Maryland
JD Offline

Moto-Amish
JD  Offline

Moto-Amish

Joined: Jan 2006
Posts: 1,979
Maryland
Jim, the service manual says the clutch operating rod is 11 1/16" in length and 7/32" in diameter.


Josh
Re: Clutch Push Rod [Re: Jim Winning] #388578
08/09/11 3:11 am
08/09/11 3:11 am
Joined: Nov 2006
Posts: 326
Boston -
Mike667-neighbor of the beast Offline
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Mike667-neighbor of the beast  Offline
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Joined: Nov 2006
Posts: 326
Boston -

Should I grind the new one down to the correct length? Suggestions?
Thanks,
Jim [/quote]

yes - but do it slightly larger than old one (in increments is best to get proper/good length)- grind/lengthen and assemble and see if it works proper - if not reduce a bit more

also good to heat treat the end after grinding to best length to prolong its life (heat up hot and dip in water)


73 850 Commando
75 Ducati 750gt
78 Laverda 1200
97 Ducati 900 SS
61 BSA A10
62 Triumph T110
Re: Clutch Push Rod [Re: Jim Winning] #388583
08/09/11 5:17 am
08/09/11 5:17 am
Joined: Apr 2006
Posts: 1,406
New Zealand
J
johnm Offline
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johnm  Offline
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J

Joined: Apr 2006
Posts: 1,406
New Zealand
I think it is very important to do the heat treatment.

Plus check to make sure the diameter is exactly the same as the old one. Sometimes people supply near metric equivants and they can bind, overheat and seize.

Re: Clutch Push Rod [Re: Jim Winning] #388690
08/09/11 10:10 pm
08/09/11 10:10 pm
Joined: Jul 2007
Posts: 529
Wollaston Northants
kelvin Offline
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kelvin  Offline
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Joined: Jul 2007
Posts: 529
Wollaston Northants
Heat to red hot and cool in oil.

Re: Clutch Push Rod [Re: Jim Winning] #388760
08/10/11 11:36 am
08/10/11 11:36 am
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
M
Mr Mike Offline
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Mr Mike  Offline
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M

Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
I have measured push rods as well as clutch rods before and they vary. Cannot imagine the quality control problems BSA had in those days as these are incredibly simple things to control. If the push rod is too short the grub screw can't take up the slack, and if it is too long it sticks out too far and hits the cover. If your plates are fairly new (full thickness) check by trial and error to get it right.

Mr Mike

Re: Clutch Push Rod [Re: kelvin] #388903
08/10/11 10:26 pm
08/10/11 10:26 pm
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
D
DickDastardly Offline
BritBike Forum member
DickDastardly  Offline
BritBike Forum member
D

Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
Originally Posted By: kelvin
Heat to red hot and cool in oil.


Quench in water!

As per SRM instructions when shortening the push-rod when fitting the Alloy clutch plate!

See paragraph 10.



Regards




Re: Clutch Push Rod [Re: DickDastardly] #388989
08/11/11 9:26 am
08/11/11 9:26 am
Joined: May 2004
Posts: 3,859
Sydney Australia
B
BSA_WM20 Online content
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BSA_WM20  Online Content
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B

Joined: May 2004
Posts: 3,859
Sydney Australia
Quote:
Quench in water!

And the ASTM Handbook says to quench is oil.
Water quenching small diameter rods is too severe and can lead to cracking.

Whichever medium you use it is even more important to swish the rod around to prevent gas bubbles sicking to the surface and creating unevenness i the hardless.


Bike Beesa
Trevor
Re: Clutch Push Rod [Re: BSA_WM20] #389012
08/11/11 2:01 pm
08/11/11 2:01 pm
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
D
DickDastardly Offline
BritBike Forum member
DickDastardly  Offline
BritBike Forum member
D

Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
The 'Trevor way' or the 'SRM way' smile Your bike, your choice!
Regards




Re: Clutch Push Rod [Re: ] #389087
08/11/11 8:05 pm
08/11/11 8:05 pm
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
D
DickDastardly Offline
BritBike Forum member
DickDastardly  Offline
BritBike Forum member
D

Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
Originally Posted By: 1968BSA
Originally Posted By: BSA_WM20
Quote:
Quench in water!

And the ASTM Handbook says to quench is oil.
Water quenching small diameter rods is too severe and can lead to cracking.

Whichever medium you use it is even more important to swish the rod around to prevent gas bubbles sicking to the surface and creating unevenness i the hardless.


I had an engineer tell me the same thing. He basically refered to anything that needs hardening to use this method for this reason.

Copper gaskets etc, only use water to help remove scaling.


Ah if it's in the ASTM it must be gospel laughing

I'm really disappointed that my pushrod hasn't cracked since I put it in water wink

I bet it doesn't make a rats a55 difference what you put it in blush

But I'll let you techno-buffs deliberate this further!

Me I'm off to start a new 'Oil Thread', "What shall I use in my gearbox"? Washing up liquid or Hypoid 90?
My mate told me to use 'Fairy Liquid' (don't use the Tesco Value stuff it's rubbish) Fairy Liquid, reduces friction and keeps the cogs "sparkly clean", well that's what it says in the Handbook!

laughing laughing
smirk


Last edited by DickDastardly; 08/11/11 8:07 pm.



Re: Clutch Push Rod [Re: ] #389097
08/11/11 8:36 pm
08/11/11 8:36 pm
Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
D
DickDastardly Offline
BritBike Forum member
DickDastardly  Offline
BritBike Forum member
D

Joined: Jul 2010
Posts: 221
Lives in Devon, covered in oil
Originally Posted By: 1968BSA
laughing

Silly andy, everyone knows you should use Persil!


Sorry mate, I've got it wrong again blush




Re: Clutch Push Rod [Re: Jim Winning] #389113
08/11/11 9:15 pm
08/11/11 9:15 pm
Joined: Oct 2007
Posts: 1,542
Auckland NZ
Ignoramus Offline
BritBike Forum member
Ignoramus  Offline
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Joined: Oct 2007
Posts: 1,542
Auckland NZ
If it silver steel you can use either water or oil depending on how hard you want to get the ends.

I used water quench when making things like production drill bushs which needed to be like bearing hard.

But for things where brittleness is an issue (like the push rod) I would definatley go with oil quench. The thing that makes the biggest diffrence to hardening silver steel is how hot you get it and how long you hold it at that heat for. Discussing quenching media is pretty pointless without a material spec , exact temprature of heating and lenght of "soak"


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
Re: Clutch Push Rod [Re: BSA_WM20] #389203
08/12/11 12:29 pm
08/12/11 12:29 pm
Joined: Jul 2011
Posts: 37
Massachusetts, USA
J
Jim Winning Offline OP
BritBike Forum member
Jim Winning  Offline OP
BritBike Forum member
J

Joined: Jul 2011
Posts: 37
Massachusetts, USA
Thanks guys. The existing pushrod was mushroomed at one end and an additional ballbearing had been added on the lever side to try and make up for the wear. It was now at the point where even at the full limits of the cable and pressure plate adjustments it would creep in gear when hot. The SRM description for customizing is helpful. The diameter of the new rod seems fine. Will let you know how I make out.


1972 750 Commando
1972 750 Commando Fastback
1974 850 Commando
1967 Matchless G15
1967 Norton P11 (Project)
1974 T150V
1970 T120R
1970 TR6 (UK)
1970 T100C

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