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Exhaust valve pitting.
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arossco



Joined: 15 Oct 2008
Posts: 35
Location: Glasgow
PostPosted: Mon May 20, 2013 3:37 pm    Post subject: Exhaust valve pitting. Reply with quote
Hi -

I'm overhauling my 1956 Cresta engine, and have noticed some pitting on the exhaust valve stems, though the valve seat area seems to be Ok.

Should I replace the valves which have this kind of pitting ?

Ross

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peter scott



Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
PostPosted: Mon May 20, 2013 6:27 pm    Post subject: Reply with quote
Hi Ross,

I don't think the pitting will make your stems any more likely to fracture than the collett grooves and I don't think they will noticably affect the rate of oil passage down the stems so my advice would be just to fit them.

Peter
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Phil - Nottingham



Joined: 01 Jan 2008
Posts: 1252
Location: Nottingham
PostPosted: Mon May 20, 2013 7:34 pm    Post subject: Reply with quote
Acid/moisture in old oil but probably will be OK
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arossco



Joined: 15 Oct 2008
Posts: 35
Location: Glasgow
PostPosted: Mon May 20, 2013 8:39 pm    Post subject: Reply with quote
Many thanks Peter and Phil - I'll put these valves back into service !

Ross
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