Re: IML: 73 Imperial valve pics

["mike and linda sutton" <mikanlin62@xxxxxxxxxxx>]

Dave

Replying publicly for the benefit of anyone else who may be interested, from 
what I can see, the valves are not recessed.  It appears that one can still 
see the vertical side of the valve, ( hard to describe )  from the area of 
the valve face that contacts the head up to the flat part of the valve that 
you see looking straight down on them.  This is called the valve margin, 
typically if the seats are recessed the margin is hidden because the valve 
is now sitting down in the hole created by a recessed seat.

As far as carbon, it could be a combination of oil getting past the valve 
seals ( they turn rather hard and brittle with age and use ) , some getting 
past the rings and some from a rich mixture.  Often one will see the exhaust 
valves are nearly white in color, from the higher temps, yours are reddish 
brown from gas additives but some still show carbon adhering to them.

If it was me, I would take the heads apart and make sure you keep the 
orientation of the valve to its corresponding seat, and examine everything 
after that.  Its totally useless to do anything to them if the valve guides 
are worn out,  since the guide is what centers the valve on its seat.  Also, 
you need to know if the valve stems are worn.

Also, you can clean the rocker shafts and arms ( keep in mind the difference 
between the L and R rocker arms, its subtle but there are two different 
rockers for each cyl ), you can use solvent or whatever you prefer to clean 
this stuff.  If the rocker shafts are excessively grooved where they contact 
the rocker - more than what will catch your fingernail - consider getting 
some different ones.  Used are fine as long as they arent worn out.   Also, 
check the pushrod ends of the rockers, sometimes they will wear out in that 
end.  The other ends of the rockers are not as troublesome.

If you have a gouged valve stem, they can be reground if its not too deep. 
You dont want to go so far that you go beyond the hardened part of the tip.

As with any engine machine process, the condition of the individual parts 
involved will dictate what you will need to do next.  If the guides arent 
worn out and the guide to valve stem clearances are ok, go ahead and grind 
the valves and seats yourself if you have the equipment.

Good luck, contact me offlist if you need

Mikey
62 Crown Coupe 


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