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Oil Pressure Relief Valve

 
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nortonfan



Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia

PostPosted: Sun Feb 13, 2005 11:47 am    Post subject: Oil Pressure Relief Valve Reply with quote

Can anyone advise me on how to test the spring in the oil pressure relief valve that is in the timing cover ?

Another question is: How many shims were fitted originally at the end of the spring when new ?

What is the procedure for setting the oil pressure relief valve up after disassembly ?
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Guest






PostPosted: Sun Feb 13, 2005 8:20 pm    Post subject: Reply with quote

Greetings,
According to my manual the pressure relief valve is originally setup
at the factory to prevent oil pressure from exceeding 45-55 PSI. Evidently using whatever number of shims required to do so. The valve isn't suppose to need any maintenence (although in a previous post someone said that they had found theirs stuck). I quess you'll just have to make sure its free, stick it back in and test your oil pressure.

justa thought,
G.B.
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fastback



Joined: 18 Jul 2004
Posts: 245
Location: Toronto, Canada

PostPosted: Sun Feb 13, 2005 10:06 pm    Post subject: Reply with quote

I was the one that found the piston in the valve stuck - solid! Shocked

Mine was shimless btw ~ no idea if that was original setup, but considering the state it was in I would guess it hadn't been touched in 35 years.

I was thinking of testing it with my aircompressor by threading it to a section of pipe and increaseing the pressure until it blows off... but I never got around to it. I plan a bottom end rebuild for next winter so I will get into the nitty gritty then.

I never did find out if the torque spec listed was for the valve to case or for the dome nut to valve.

Let me know how you fare!
Phil
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L.A.B.
Moderator


Joined: 20 Nov 2004
Posts: 1948
Location: Norfolk, UK

PostPosted: Mon Feb 14, 2005 1:20 pm    Post subject: Reply with quote

RGM Motors in the UK sell an oil pressure test gauge kit (RGM item 908B).
This consists of a gauge, a short length of pipe and an adaptor that fits alongside the rocker feed pipe connection to the timing cover with a double banjo bolt and copper washers (also supplied in the kit) so that the rocker feed isn't disconnected during testing.
I bought the gauge kit and shims because I also found that my own pressure relief valve had no shims fitted, although when I tested the oil pressure I found that the valve was opening at the correct pressure.
Not only is the gauge useful for checking the relief valve it can also be used for general oil pressure checks.
The gauge isn't really meant to be permanently fixed, just for test use.
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nortonfan



Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia

PostPosted: Tue Feb 15, 2005 8:34 am    Post subject: Reply with quote

Thanks for the replies.

I wondered if you could test the spring like a valve spring ?
The easiest way would be to just buy a new one I guess.

There were no shims in this setup......but the domed nut & other nut have been butchered. It has been messed with........

I have fired the 850 engine up, started second kick Very Happy but I really wont feel at ease until I know this relief valve is correct.

The oil appeared to be returning ok into the oil tank, just like any other I have seen.

So, to be certain I guess I will have to find a longer banjo bolt & hook it up to an oil pressure guage I have had lying around since the pyramids were built.
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.