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Timing chain replacement is often neglected because there is no fixed service interval for replacement. It's a wear item, and a lot of owners have gotten in trouble by neglecting the chain (and related tensioning components), often because the "life of the car" timing chain story was presented to them at the time of purchase and they actually believed it. |
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Combine this with the personal anecdotes of 200K miles on a chain, and it's a recipe for disaster (a large percentage of vehicle owners could also get 200K miles from a belt, but is it worth the risk?). |
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If you ask a dealer's service department or independent mechanic whether the chain needs replacement, the owner is likely to get an affirmative answer because a) if they say no and the chain breaks or slips soon after the owner inquires about it then the owner will claim that they're liable, b) they want the money from the repair job, or c) the chain really needs replacing. |
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Chains versus belts is one area where I'm not a retro-grouch. The reason for going to belts is a) they're quieter, b) they're more suitable for longer runs than are the norm on newer engines, |
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c) it's easy and inexpensive to replace them on a routine basis, |
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d) they're more reliable, and of course |
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e) they're less costly for the manufacturer. |
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