[Vwdiesel] NA exhaust valves for a TD head?

[Shawn Wright]

On 7 Apr 2005 at 0:41, James Hansen <jhsg at sasktel.net> wrote:

> Well Loren and I corresponded about this.  These aren't sodium filled
> valves, these are a stellite coated valve.  Sodium filled means big stem to
> accomodate the sodium filling, so it has room to slosh around when the valve is
> hot and dissipate heat.  No room for this on a turbo diesel head. Stellite just
> makes for a much more durable valve, but cannot be resurfaced, or you lose the
> coating... hence replacement.   Thinking about it today, that's the only thing
> that makes sense too, as I've NEVER seen a diesel head with sodium valves, not
> that I've seen a lot, but they are unmistakable, due to the big stem.

I've only ever seen sodium valves once (on my 1.7L Renault engine) and I don't 
remember what they looked like, only that they were big $$$. What do you mean by 
resurfacing? Is the coating on the flat face of the valve only, or also on the sealing 
surface? Does this mean they can't be reground?

Shawn Wright
http://zuiko.sls.bc.ca/~swright
'85 Jetta D 
'88 Westy 2.1L, soon to be 1.6TD 5 speed
'82 Diesel Westy