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Engine went boom

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Turbo2g

5+ Year Contributor
278
54
Oct 13, 2017
Fallbrook, California
Out of no where I started the car and heard a terrible knocking noise. Turned off right away, to avoid further damage. Grabbed a friend to crank while I listened under the hood. After checking a few things, started again and got a lot of banging around in the top of the engine. Then it became a crank no start. I'm almost certain it jumped timing and valves hit pistons. Sounds like it may have broken off rocker(s) from what I heard bouncing around.

Looking for advice on the best way to go about this. I have to re-time the engine in order to get a compression check. At which point I may find the head needs to come off anyway. The timing process would be a waste of time if that's the case. Should I pull the valve cover first? If I find damaged components, is it worth replacing them, timing the engine, and compression checking? Or is it a definite thing that the valves are destroyed too. I don't want to be throwing parts and work at it only to tear it back down.

Here's what I think happened. On the ground where it is currently parked, there are a bunch of nuts from a tree. My car never had upper timing covers when I got to it. A rodent may have decided to store its stash down in the lower timing cover area. Hench why a perfectly fine running daily with no signs of issues suddenly went boom.
 
I have the head back now. They found the two valves I suspected were shot and replaced them. Replaced all valve seals, performed a valve job on the rest, and machined the surface. Now to find time for the install.
 
I did find that I have the "A" stamped cams. I had asked a question about stock cams in another thread that got removed for some reason. According to the list, the A cams are second only to the "J" grinds. Pretty good info to know!
 
Alright, she’s back up and running! I had time to put her back together yesterday. Running like a champ again. Took the time to do a lot of cleaning and gave the valve cover a paint job too. It looked terrible before.
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