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Q: timing chain replacement cost on 2005 Pontiac Sunfire

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timing chain tension-er loose and chain fell off
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I have almost completed this as a DIY project. You most likely have bent and broken valves, damaged pistons, bits of broken metal throughout your engine. I Ended up buying a used head from a junk yard and a rebuild kit with new bearings, pistons, and rings. I would guess I am near $1200.00 including machine shop and a few tools I didn't have. Plus now little things like fluids, thermostat, water pumps, and all new sensors will add a couple of hundred more. Hope that helps when you get a bid, not a cheap engine to work on!
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