Quote:
Originally Posted by GreatWhiteEbola
I broke the timing belt in my Lancer and potentially did damage to the head/valves. In your experience, would pulling the spark plugs and witnessing significant oil accumulation be an indication of valve/ seal damage? I have a cheap USB video bore-scope that will take it's maiden voyage into the head of this car, I don't know what I might see...I am looking for valve impressions on the pistons. Any additional advice in this situation? TIA and it's great to have someone with real training weighing in, THANK YOU!
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Valve impression on the pistons is a good indication. In my experience oil on spark plugs is a leaking valve cover. The best test is a compression test. If you have low or 0 compression, chances are you bent valves. Obviously to do this you have to replace the timing belt. Also the sound of the vehicle when you turn it over is a good indication of bent valves. If it sounds like a spinning wheel and not an engine that turns over, chances are you damaged the valves.
Having said that, most interference engines once the belt snaps the cylinder head needs to be removed for further evaluation and from experience its never good.