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B40 Rocker spindles #703082
07/28/17 8:11 am
07/28/17 8:11 am
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
SmoothPierre Offline OP
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SmoothPierre  Offline OP
BritBike Forum member
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
Being as I am waiting for my timing side bearing conversion (Alpha Bearings are making some). I thought I'd have a look at the rockers and shafts, because from my mind they looked a bit dry. There is delivery of oil from the oil line, so I wondered if they might be 'sludged' inside. I tried a gentle tap with plastic hammer but they don't seem to move, How tight are they in the housing? I have searched for removal instructions but found nothing - Is there a method for removal of the rocker spindles ? The machine in question is 1965 B40F, thanks for the help.

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Re: B40 Rocker spindles [Re: SmoothPierre] #703092
07/28/17 9:37 am
07/28/17 9:37 am
Joined: Dec 2004
Posts: 9,377
Scotland
kommando Online content
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kommando  Online Content
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Joined: Dec 2004
Posts: 9,377
Scotland
Unless you can detect excessive play or they are leaking leave them alone, you can test the oil route with an oil can forcing oil through but they do not need much.

Re: B40 Rocker spindles [Re: kommando] #703305
07/30/17 7:26 am
07/30/17 7:26 am
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
SmoothPierre Offline OP
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SmoothPierre  Offline OP
BritBike Forum member
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
Thank you - saved me some hassle.

Re: B40 Rocker spindles [Re: kommando] #704330
08/08/17 4:56 pm
08/08/17 4:56 pm
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
SmoothPierre Offline OP
BritBike Forum member
SmoothPierre  Offline OP
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Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
I tried the oil can method and the inlet is perfectly fine, but the exhaust rocker arm has nothing coming through to the pushrod end. Oil escapes from each end of the arm but nothing from the push rod end, I tried a bit of wire in the hole but still nothing moves....what to do?

Last edited by SmoothPierre; 08/08/17 4:56 pm.
Re: B40 Rocker spindles [Re: SmoothPierre] #704331
08/08/17 5:02 pm
08/08/17 5:02 pm
Joined: Dec 2004
Posts: 9,377
Scotland
kommando Online content
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kommando  Online Content
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Joined: Dec 2004
Posts: 9,377
Scotland
Use the oil can to force oil through from the push rod hole, you may need some way to seal the oil can to the rocker push rod end so the pressure is high. Failing that its rocker shaft out and probing the arm, you can give it a good soaking in diesel for a few days so hopefully the blockage is softened.

Re: B40 Rocker spindles [Re: kommando] #704348
08/08/17 6:56 pm
08/08/17 6:56 pm
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
SmoothPierre Offline OP
BritBike Forum member
SmoothPierre  Offline OP
BritBike Forum member
Joined: Feb 2012
Posts: 112
Brum, West Midlands, UK
Thanks Kommando, I think i'd like to soak the arm in diesel and try to clear it that way. What is the best way to remove the spindles? I have tried nylon hammer but they seem very tight. ( I have just found out today that Alpha Bearings have finished making the bearing conversions and I should get it next week, cant wait.)

Re: B40 Rocker spindles [Re: SmoothPierre] #704350
08/08/17 7:28 pm
08/08/17 7:28 pm
Joined: Sep 2004
Posts: 799
Farnham, Surrey, UK
gunner Offline
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gunner  Offline
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Joined: Sep 2004
Posts: 799
Farnham, Surrey, UK
To remove the rocker spindles, I would try heating the rocker box until its too hot to touch, then a few sharp taps with a large hammer should work, but make sure you protect the spindle threads by fitting a nut.

When replacing the spindles you need to use new "O" rings and a common problem is the "O" rings become cut because of the close interference fit with the rocker box. You can try counter sinking the holes in the rocker box to ease installation, also try to find some "O" rings which fit the spindle nicely, are not too thick to become cut but thick enough to seal.


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