the middle cylinder it could have broken when it was installed. I've done that
on that particular cylinder - several times before I got wise.
But before you assume the worst . . .
Try pulling the glowplug and the injector and see if you can see anything loose
inside the prechamber first. You know - something that might be clogging the
holes in a one-way-valve sort of way.
Crank it several revolutions, without the glowplug and injector, to blow
anything (like an old glowplug loop segment) that might be in there out of
there.
Valves are FORCED open and allowed to close. So "sticking" closed is a very
unlikely explaination unless 1)the valve is horribly out of adjustment (loose)
or 2)that particular cam is ground down to a circle. Pull the cover and give it
a good look-see.
And if it's opening late, then the mis-shapen cam for that valve will be
apparent if you look closely enough.
But so far none of this requires pulling the head.
Certainly a compression check is warranted.
But don't go for the throat when a slap in the face will do.
Bogy.
--- BStromsoe <bstromsoe@yahoo.com> wrote:
> No matter what your problem is - it is time to take the head off and eyeball
> things.
>
> brian
>
> babytoelint <babytoelint@yahoo.com> wrote: I
> think that the exhaust valve on my 1977 240D is either sticking
> closed or opening late.
>
> The symptom: The center of the glow plug on the number three cylinder
> blows out of the body of the plug. The first time that it happened, I
> figured that it was just an old plug that did not make it until I
> planned on changing it. Now a new plug has blown out.
>
> The only thing that i can think of would be the exhaust valve sticking
> closed or opening late.
>
> I am planning on replacing the timing chain, since I do not know when
> the previous owners did that last.
>
> Any other ideas that I should look at, before pulling the head to get
> at the valves?
>
> brian from la verne, ca
>
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