Lawrence,
Unfortunately the onbly experience I have with a Pfsssss sound from the
exhaust, was an exhaust valve with a wedge shaped cut in it from being
adjusted too loosely and having hot gasses cutting the valve head over
time.
I hope I am wrong. Carbon buildup would be great. Good luck
Jack Brooks
Hillsdale, New Jersey
'74 Norton Commando Roadster
looking hard for a TR-3
On Tue, 01 Oct 1996 09:11:53 -0500 Lawrence Schilling <lchillin@siu.edu>
writes:
>
>Had a local shop do a tune-up on my '73 Stag with the '73 TR6 engine
>yesterday. The mechanic said the valves were at about 50 so he
>adjusted
>them to about 10 each. Does this sound right??
>
>He also said there is a Pfssst sound coming from one of the valves
>which he
>diagnosed as an exhaust leaking past an exhaust valve that has some
>carbon
>build up on it. Does this sound right??
>
>He recommended I just drive the car for a week or so with the valves
>properly adjusted and see if the carbon might clear up and the sound
>go
>away. Probably wishful thinking but sounds good to me.
>
>I could tell there was something going on before the tune-up by
>noticing a
>little roughness at idle and slight loss of power with a very subtle
>stumble
>in the revs now and then.
>
>Am I looking at a valve job Ya think???
>
>
>lchillin@siu.edu
>
>'73 STRAG
>
>
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