Overheate-head knocking: need opinions on what to do.

[Brett Goetz]

Thanks for the replies!  Here are my answers to your questions.

How long did the car run in the "overheated" state?
-I don't know.  Unfortunately my wife was driving it when it happened 
and can't remember when the light when on.

When you say the head is knocking what does this sound like? I am
visualizing something louder than lifter ticking.
-I know it is louder than a lifter, because I have replaced mine.

Is the car losing any coolant now?
-Not since I fixed the hose.

Have you checked the compression both cold and hot?
-No, I don't have compression tester.

Check for cracks in the EM and down pipe weld. I confused mine for bad
lifter noise. Usually changes as engine warms up.
-I'll check for that, but the sound did not change after the engine 
warmed up.

If it sounds like someone is hitting the head with a
hammer, it's probably a bad rod bearing.
-I've heard a bad rod and it doesn't have that lower clunking metal 
sound that I associate with it.  But this was on a Volvo 240, maybe the 
sound is different.

You might pull your oil filter and take it apart to see if you
have little metal flakes in there.
-That's a good idea,  I'll have to look this weekend.  I took the 
dipstick out and there was no coolant mixed with it.

So I take it you drove a while with no coolant?
-Unfortunately, knowing my wife, I would have to say yes.


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