Thanks for the info. I'll swap the collars around tomorrow and check the
installed height.
- Hugh
> -----Original Message-----
> From: ZinkZ10C@aol.com [mailto:ZinkZ10C@aol.com]
> Sent: Saturday, April 27, 2002 7:55 PM
> To: hfader@usa.net; triumphs@autox.team.net
> Subject: Re: Inner and Outer Collar on Exhaust Valves
>
>
> In a message dated 4/27/02 4:47:39 PM Eastern Daylight Time,
> hfader@usa.net
> writes:
>
> << So now, my question is: What is the function of the double
> collar? The
> exhaust springs will have more pre-load and more load when
> fully open. Is
> this to keep them from binding or something?
>
> - Hugh Fader >>
>
> Is this double collar a tin cover that goes over the spring
> or a two piece
> looking spring retainer? ( the part that has a hole for the
> valve stem)
>
> The following is for engines in general:
>
> If it is a two piece retainer it may be a valve rotator.
> These are used on
> the exhaust valve and are really just a bearing that allows
> the exhause valve
> to rotate a bit each time the valve is opened and closed.
> The theory is if a
> piece of carbon is stuck in the seat the valve rotation will tend to
> displace/crush/grind the debri. If a valve is a non rotator,
> there is a
> chance the carbon will be imbedded into the seat causing it
> to burn a valve.
>
> Usually the valve springs or the valves are of differing
> heights to allow
> proper spring installed height. Have you measured installed
> height? Miss
> matched parts should have a pretty substantial height
> problem, something like
> 3/16" or greater.
>
> If it is a tin cover, I've seen these on some engines but
> don't remember what
> valve they go on.
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