It is something GM should be fixing out of their pocket.
This chronic problem is well documented among GMs 2.0, 2.2, and 2.4 engines the entire eco tec line. If left unchecked, this can cause engine destruction, as this IS an interference engine. It breaks, the timing chain goes slack, and begins destroying the rest of the timing components as it knocks around. The story is the same for all these engines. This is very clearly a fatal design flaw. This is NOT something that was caused by neglect or abuse on my part. The job took me, with no lift, only a garage, basic hand tools, and a corded impact gun about 12 hours to complete, my entire weekend. That would be more than enough to break teeth off a timing sprocket, make the chain jump teeth, or break a chain, causing valves to hit pistons. Much more, and a piece of it about 10mm x 60mm would have been dislodged and released into the timing case. The upper timing chain guide, the steel one that sits between the cam phaser sprockets just under the valve cover was eaten almost completely through. I maintain that this was NOT a maintenance related failure.
#2011 chevy malibu timing chain replacement cost free
Otherwise, the engine was squeaky clean and free of deposits, as you'd expect from a well maintained engine with fewer than 70,000 miles on it. Upon pulling the timing cover from the front of the engine, I found more chunks of broken timing chain guide, pulverized nylon, and metal shavings that had been circulating in the timing case for God knows how long. I paid approximately $400 for parts and an inch/lb precision torque wrench I did not have. It was an intimidating job made possible for me only by the internet and a good ol' Haynes manual. Thankfully, this was something I was able to fix myself, barely. Quotes others received to repair this problem ranged from $1500 to $2000 from all the things I read online, and seeing how involved this job is, I am not surprised. Ive changed the oil more often than the computer "oil life" algorithm calls for, and Ive ALWAYS used dexos approved oil of the correct viscosity, checking twice a month and adding as necessary. Mind you, I've maintained this car since it was purchased new. Removal of the valve cover revealed a severely slack timing chain, a destroyed upper timing chain guide, and pieces of metal and nylon sitting in the cylinder head by the cam towers. The noise always occurred between 15 RPM, at high load conditions, i.e. Engine began making a chattering / slapping noise from the passenger side under the valve cover.
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