Alloy head push rod tube seals

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keith.mettam
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Re: Alloy head push rod tube seals

Postby keith.mettam » Thu Mar 01, 2018 10:36 pm

Lee,
As Tony has correctly pointed out, you make your alloy inserts to suit the Viton 'O' rings you are going to use. My NH inserts use a 2mm diameter 'O' ring with a bore of 20mm on each side (i.e. 2 'O' rings per alloy insert, visible in the images uploaded in Shane's thread). I got a pack of five of these cheaply from Simply Bearings.
All the best with it,
Keith.

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Re: Alloy head push rod tube seals

Postby Leejm » Fri Mar 02, 2018 7:06 am

This is true just make the top hats to suit the o rings I can get I will do just that. Many thanks everyone Lee
1948 NH, BSA D10 SPORTS. 1953 VHA (project)

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Re: Alloy head push rod tube seals

Postby Leejm » Fri Mar 16, 2018 11:43 am

The boss is on holiday, so you never guess what I've been up too!!
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Re: Alloy head push rod tube seals

Postby simon.holyfield » Sat Mar 17, 2018 8:38 am

They look useful. Maybe post the dimensions for others?

I'm thinking about a similar thing for the W/NG, since it's weeping from the push rod tubes - and I've just bought a mini-lathe!
cheers

Simes

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Re: Alloy head push rod tube seals

Postby Leejm » Sat Mar 17, 2018 8:45 am

Hi Simon they are for an alloy head for my vha, but I'm sure you should be able to use o rings with the chrome push rod tubes on the iron engine. The o rings I'm using are 27mm od with 3.1 wall, this is the nearest size too the imperial size given on the drawing.
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Vincent.vanGinneke
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Re: Alloy head push rod tube seals

Postby Vincent.vanGinneke » Sat Mar 17, 2018 10:11 am

Yes, but why not a Viton ring on both sides?

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Re: Alloy head push rod tube seals

Postby Leejm » Sat Mar 17, 2018 10:15 am

Do you think this is a better idea Vincent? If so I can do just that.
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Re: Alloy head push rod tube seals

Postby Vincent.vanGinneke » Sat Mar 17, 2018 10:50 am

I think so yes.
The drawing from K.R. Whiston is a bit sloppy, it looks like the inner lip could get trapped by the inside of the barrel.
Ofcourse you have to make sure that the inside rim clears the pushrodholes.
But with only one Viton ring you have to depend on that you use the exact size otherwise the oil will find a path along the top and back of that one Viton ring.

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Re: Alloy head push rod tube seals

Postby simon.holyfield » Sat Mar 17, 2018 11:15 am

Anyone done a similar thing for an engine with external pushrod tubes?
cheers

Simes

'51 Square Four, Masquerading D3 Bantam, '58 Huntmaster, '42 W/NG, http://ariel-square-four.blogspot.com

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Re: Alloy head push rod tube seals

Postby pete.collings » Sat Mar 17, 2018 11:20 am

The drawing was originally supplied by Ralph Hawkins, I made a set of seal holders to the pattern, and then sealed the base fitting with silicon rubber, allowing it to cure fully before fitting the o rings. The underside of the holder was also packed with some gasket material so that when fitted there would be 20-30 thou crush on the o rings.
You could modify the dimensions of the holder to suit your own cylinder head, but it would be advisable to ensure the the degree of compression of the o ring(s) when fitted is around the figures given above, which I believe is the values recommended for use with Triump twin pushrod tubes.


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