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Even though you didn't break the timing chain, sounds like you certainly skipped several teeth. The usual piston-to-valve meeting probably took place, sorry to say.
At the very least you'll need to pull the head to assess the damage. Have a look at both the pistons and the valves. Sometimes the pistons can get nicked, cracked, or have bits of valve or guide embedded in them. You'll also want to check the cylinder walls for scoring. If you have scoring then you will need to replace the engine because you can't easily hone that out.
If you're lucky you will only need to replace the head. If you find one bad piston you might be able to find a single replacement (I did once) but that's often difficult to find since most boneyards down break engines down that far. Heads are cheap enough that I think you should just go that route rather than trying to rebuild yours.
Any head from 91-93 will work (and in fact you could use a 2.0 head -- I did once). But ideally find a 91-93 turbo head.
You also want to check the balance shaft chain, which I bet is the cause of all this. It probably broke or its sprocket wore down and let it tangle with the timing chain.
Depending on the amount of carnage in the timing cover area, you may need to replace the timing cover. Rotating exploding parts frequently eat away at the inner surface of the timing cover in the area of the oil pickup tube, opening an air passage and preventing the pump from developing pressure. If it's bad, replace.
If you're really really lucky the pistons didn't strike the valves and you can reuse what you've got, but given the length of time you drove and the nature of this type of failure, I think you're in for a bit of serious surgery. If you're a decent wrench you can do it all yourself, and it's a satisfying project. But make certain the block and pistons are sound before proceeding.
If you're not planning to do the work yourself, consider sourcing a complete engine to swap in (and to bolt up your existing Aero turbocharger), as this will likely save you a good deal of labor cost.
And finally, it may be time to consider whether it's worthwhile at all for a 93. Aero or not, values are low for these cars and anything short of a museum piece may not be worth a large outlay.
posted by 68.195.246...
, Fri, 26 Oct 2007 09:47:04, Fri, 26 Oct 2007 13:38:50
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