[s-cars] 1995 S6 - Overheating damage, now what?

[Joshua Van Tol]

I'll add a counter point. If the engine was overheated enough, and it sounds
like it may have been, the piston skirts could be scuffed, and the rings
could be shot. Once the head is off, any scuffing or material transfer on
the cylinder walls will be evident. If such damage has occurred, a complete
rebuild or replacement is the only option.

If your mechanic has a scope, it may be possible to look at the cylinder
walls through the spark plug holes and see if there's any damage to the
cylinder walls. Even if your mechanic doesn't have one, they're getting
cheap. I saw one at Costco the other day for $180, including a video record
function.

Josh

On Tue, Sep 13, 2011 at 11:16 AM, Sean Douglas <quattro20v at shaw.ca> wrote:

> Thomas:
>
> I would recommend repairing it. I doubt the engine block is cracked, but
> the head is probably warped and the gasket needs replacing.
>
> If you motor had good compression before and was not burning excessive oil,
> then the piston rings should be fine.
>
> I would do pressure test on the head, check the valve guides for wear and
> replace them if required. If you replace the guides, then a valve seat grind
> is required.
>
> I just went through a head rebuild project and the machining was $400 and
> the parts came to about $300 including some new coolant hoses and the gasket
> kit, new head bolts, etc. I did all the labour myself, but if you were to
> pay someone, it would add 6-8 hours labour.
>
> Sean Douglas
> 1997 S6
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