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Hi there,

My garage is just about to fit a recon engine to my L322 after the timing slipped and basically destroyed my valves and pistons (and god knows what else). I saw the engine with the head off so have seen the damage but what I'm unclear about is how the timing could slip in the first place. Looking at the chain and the gears it's not like it can slip easily. Anyone have any experience here and could give some thoughts? Not expecting absolutes but it just seems crazy that this is even possible.

Cheers,
Brian
 

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I can very easily happen as the timing chain tensioner and guide rails wear. However I am surprised the noise was not an indicator that something was amiss in the front of the engine.

There is a TSB to have the guides and rails replaced as well as many threads in this section and the L320 section. Near the top of the L320 section there is a recent thread with photos of the parts that are replaced along with detailed photos of the engineering changes in the parts.
 
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