You could have a valye seat that has come loose
...if it jams open the piston will hit valve , BANG ,
now you have a major problem ..
DON'T DRIVE IT .. pull the head and
check it
Norman Nock
--- "Steve B. Gerow" <steveg@abrazosdata.com> wrote:
> Today my engine just started making a very loud
> intermittent clatter.
>
> Happened at startup when cold, went away after
> around 20 sec running.
>
> After a couple of 10 mile drives with stops, clatter
> returned on 190 degree
> engine. Engine speed-linked. Interestingly it sped
> up and became lighter
> when I took my foot off the gas.
>
> With the car stopped, it seemed to be coming from
> the area of #2 cyl's
> valves. After a couple of minutes it went away again
> smooth as silk. Then
> returned after a short distance. Came and went
> during 5 mile drive home.
>
> Oil pressure normal around 35 lbs same as it's been
> for years.
> Later checked oil 1/2 way up dipstick.
>
> No fan, water pump or generator irregularities or
> interference. No over
> heating or missing or rough running except for this
> extremely loud clatter
> which I could feel coming thru the car, slightly. No
> smoking.
>
> On removal of valve cover only evident irregularity
> was foot-tall geyser of
> oil off one of #5 cyl's rockers.
>
> Appreciate any guidance! Thanks in advance.
> --
> Steve Gerow
> Pasadena CA
> 59 BN6--29D engine
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