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Gasket material

Viceroy

Joined: 14-10-14

Topics: 13

Replies: 18

Posted: Tue 1st Nov 2016, 5:27pm
Gasket material

Would someone be kind enough to confirm what would be the best gasket material ( Name ) to use between piston, frame and valve chest on my 7 1/2 Hunslet ?
 

Replies To This Post

Xz

Joined: 1-01-92

Topics: 17

Replies: 244

Posted: Wed 2nd Nov 2016, 8:31pm

I use 0.010" (0.25mm) graphited gasket paper. You only need gaskets between the cylinder and the frame if there are steamways through. If it's a solid fixing definately nothing, as it might allow a small amount of movement that could slacken the bolts.
 

Denis Mulford

Joined: 1-01-89

Topics: 4

Replies: 24

Posted: Wed 2nd Nov 2016, 10:37pm

With the risk of getting my head shot off, we use Loctite 574 flange sealant and have never had a problem with it plus you do not have to make gaskets.
 

Xz

Joined: 1-01-92

Topics: 17

Replies: 244

Posted: Wed 2nd Nov 2016, 11:21pm

No bullets from this direction Denis, a comment might be that it isn't traditional (if that matters??).

There could under some circumstances be a shortage of clearance but usually such would be shown on the drawing or assembly instructions, with a suggested min/max gasket thickness. (Not common)
 

Viceroy

Joined: 14-10-14

Topics: 13

Replies: 18

Posted: Thu 3rd Nov 2016, 8:03pm

Xz, Denis, Thanks for your replies, much appreciated
 

davidmawdsley

Joined: 1-01-93

Topics: 1

Replies: 7

Posted: Sat 19th Nov 2016, 9:52pm

Denis.. I agree about the use of a liquid gasket for the cylinder/frame/valve chest joints. I have a need to gasket a cover and joints on a 'Britannia' smokebox regulator. 574 has been suggested, but on checking the manufacturers data sheet, it starts loosing strength at 50 deg. C, and by 150 deg C is is down to 25% strength. Smokebox internals will get significantly hotter than that, specially when the engine is working hard, so is 574 the 'right stuff'or can you suggest anything else?
 

Denis Mulford

Joined: 1-01-89

Topics: 4

Replies: 24

Posted: Mon 21st Nov 2016, 4:51pm

David, sorry but i cannot advise on your question as I am no expert, I'm sort of a try it and see man, but I can say I have used 574 as a gasket on my wet header on my loco and i have never had a problem. I have also used 542 on threads with great results but a warning is never get 574 and 542 together as they set like steel.
Sorry again that I cannot help that much.

Denis
 
 
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