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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