Manifold Leak

Yes it looks like a one way valve probably used a pollution control valve if it was piped into the engine breather to pull fumes into the engine to be burned. If the valve is just open to atmosphere then all it would do is draw air in and cause a weak mixture.
 
Just a quick note , sorry my deflector plate is steel , maybe stainless ? AND after cleaning it up and seeing ''FRONT'' inscribed , it was fitted the wrong way round :) Ken
The one way valve goes into the tin box on top of the carb , I can just about blow through it from the carb end but not the other way .
 
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So it runs from the inlet manifold to the air filter housing? I'd block it off as it doesn't seem to be doing anything.
 
I have the 'spare manifold' apart and has good deflector plate if anyone needs it ? I may see how well the inlet manifold fits my exhaust and use it , if OK , as it only has the small flange hole which I can block .
 
Well done getting the manifolds apart. I managed to get some good quality manifold/head gaskets from F W Thornton of Telford. They look to have a metal type facing to both surfaces so am thinking that these are better than the cardboard looking ones. Any thoughts on that Panky. If you are looking for new brass nuts for the exhaust connection the only place I could find with the inch long ones that came off is www.scparts.co.uk., again a silly price but there we go. Spalding fasteners and Wrights Auto supplies list them but are out of stock.
Hope this helps, keep up the good work.
 
With your newly refaced manifold either will be fine. I've used both with no issues.
 
Don't know why brass nuts, perhaps they don't seize so much with only one surface to rust. I got new 1" nuts as that is what came off. As to why 1" I haven't a clue. Picked up the refaced manifold this morning, looks good, I am hoping this will do the trick and no more problems with it blowing. They even fitted new studs for the exhaust connection as they thought the originals looked suspect.
Keep up the good work. Malcolm.
 
Yes brass is less likely to seize but a smear of copper grease is still a good thing. The nuts are longer because brass nuts are more prone to stripping so the extra thread reduces the risk.
 
Thanks for replies , Yes that's what I thought ! brass strips easier than steel and yes copper grease a good idea too !! Commer on hold for little while as have bike stuff to do . I have to drill out the exhaust studs as they broke flush with the manifold ! Aint life grand ! Never a dull moment with old vehicles :) Ken
 
Try welding a nut onto what's left of the stud or just blobbing weld onto it, enough to get a pair of molegrips onto it, works a lot of the time.
 
Thanks , I'll think about that but I think the studs are well stuck as I had to use a lot of force before they snapped ! and if anything are a few thou below the manifold face . Also will have to make or find an exhaust seal ring as that broke too , or was already in peices before everything let go .
 
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