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tappet oil feed pipes
#814551 06/30/20 1:57 pm
Joined: Aug 2001
Posts: 2,935
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Richrd Offline OP
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the factory service manual talks about pipes and sealing rubbers in the crank case at the mains. My 74 does not seem to have this and I can not find it in the parts manual.

what is the story here?
thanks


Rich (last remaining member ThreeMustGetBeers)
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Re: tappet oil feed pipes
Richrd #814555 06/30/20 2:15 pm
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They got deleted by a manufacturer as starving mains of oil.

Re: tappet oil feed pipes
Richrd #815329 07/07/20 5:58 am
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Service bulletin some time in '71 said to blank them off. Later models got a blanking screw where they used to be.


Stepping on others doesn't make you stand tall.

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Re: tappet oil feed pipes
Richrd #815364 07/07/20 3:34 pm
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The pipes were originally to give an oil feed to the exhaust camshafts which were experiencing quite rapid wear.
A similar problem existed in the twins which also got an extra oil feed to the exhaust camshaft (cant remember if the inlet camshafts got them too).
The camshaft wear problem was eventually solved by nitriding the camshafts and the auxiliary oil feed was deleted.
This was advantageous as the triples oil feed to the camshaft(s) took oil away from the main bearings.
The Service Bulletin referred to involves cutting off the pipes just above the main bearing and squashing the cut end of the pipe to seal it off.
Later triples did not have the pipes fitted from the factory so nothing to do on the later bikes.
HTH


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