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timing chest oil jet

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Hello and hope everyone is safe and in good health

I am a new member so I am still finding my way around this site.

A question. I am a little confused regarding the jet that fits into the timing chest and feeds oil via the worm drive to crank. I am rebuilding a bitsa from various boxes of assorted bits into a set of 47 cases. How does the jet seat into the hole in the timing chest without it dropping out?! I  see that the timing chest recess has a left handed thread chrome holder if thats the right description, into which the jet fits. But the jet appears a lot too small and drops out. ?

I am struggling to find a decent image or parts drawing for it and Iam sure it had a spring? did theses jets change sizes over the years and is it possible that the jet I have is in fact for a later or earlier engine? maybe even a different model? 

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chris.

the oil jet fit into the timing cover and is pushed against the crank.as there should be a small spring that fits inside the jet.the jet is a a brass hollow tube with at one end a small hole.

the small hole fits against the crank and is held in position with the spring,the spring is about the same size as one from a ballpoint pen.check russel motors thay should have one..

                                                                                                                     tony.. 

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As far as I know the oil feed jet is common to the SV & OHV engines. Picture is of an old jet removed from my '56 19S. Outside diameter of this jet is 7.9mm. They should be stocked at all the usual suppliers (Andover, Norvil, RGM) together with the spring and jet holder. Andover has a useful exploded diagram on their website.

Cheers, Ian McD

Oil Feed Jet

In reply to by anthony_williams

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Thankyou Tony. I see it now and I think I have found the correct one.

Hi Ian 

Further to this post.I did in fact find the jet and spring as pictured but when I came to fit it the retaining holder that screws in to the chest (l/h/thread) appears to be quite a bit smaller diameter than the jet. 

Leads me to ponder if the timing chest and jet are off a later or earlier model? Did the jets increase in size at any point ? 

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Hi Chris

The Norvil catalogue lists 3 versions of the oil feed jet. https://www.norvilmotorcycle.co.uk/timing.htm  Scroll on past the yellow highlighted parts.

8834   0.281" (this part number appears in my '36-'38 list)

A2/12             (described as '46 & '47: no size quoted)

C2/12             (described as '48 to '56: my old jet measures 0.31")

So yes, it seems they did change the size, I didn't know that until I checked the catalogue.

Hope this helps, Ian McD

 


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