RE: One valve down, the final episode.

[Stulen James <JSTULEN@dcm.dofasco.ca>]

 ----------
|From: quattro-owner
|To: quattro
|Subject: One valve down, the final episode.
|Date: Tue, Nov 29, 1994 10:39AM
|
|Hi everyone,
|
|if you don't remember the previous episodes my timing belt broke
|when I was parked. After a new belt was fitted the compression
|test showed 0-135-135-140-100, meaning bent valve on 1.
|There was great speculation on whether the engine was interferance
|or not (5000 CS T '86). Dealer said 9 times out of 10 when the
|belt breaks, valves go with it. Independent mechanics said "no way".
|
|Anyway, as of this morning we know that the valve was bent
|because "something got into the cylinder". The cylinder head has
|some scratches all over it. The "thing", after it danced around, it went
|through the exhaust valve, got caught there and the valve bent.
|
|(!!!).
|
|Now how is that possible ?
|bad gas ? And how can a thing that big (big enough to do the damage) can go
|through the filters ?
|
|On a relative subject: The mechanic will only replace the valve. Since I
|have paid for the labor significant $$, what else would you suggest that
|is a good practice to change ?
|
|Thanks
|Evangelos
|

Since you have the belt off, when you put the thing back together why not 
open a valve all the way (using the cam :)) and then turn the crank (slowly 
!) to see if there is any interference?  Won't this put the question of 
interference to rest? I know I would like to know.  I did this test on my 
GTI 8V when I was changing the belt and now I know that the engine is of the 
non-interference type.

As for the 'something' in the cylinder. How do you know it wasn't the piston 
 that bent the valve?  Was there no marks on the piston? I believe that if 
the piston bent the valve there would be an obvious mark on it, wouldn't 
there?

Many questions still to be answered,
James