You’ve done almost four laps of the planet in this car - give the chain some credit. Nobody enjoys paying for repairs, obviously. It’s going to cost you a lot more than $1850 to change cars, so if there’s nothing else wrong with the car, get the chain replaced. (It’s very easy on all powertrain components.) You drive roughly double the national average, so I’m assuming you do a lot of highway driving, which is very easy on DCTs. If there’s no evidence of an impending DCT failure, then that’s just an irrational fear. It’s quite an involved disassembly and reassembly process. Timing chains tend to last longer and have been developed to create less engine. The cost you’ve been quoted is not excessive. Timing belts are made from high-quality rubber, whereas timing chains are metal. Luckily, these chains need not be replaced after some miles. After that, it’s just scrap metal.Īnd 145,000km is a reasonable service life for any timing chain, frankly. One major advantage of using timing chain over belt is its long-lasting feature. If a chain or a belt breaks, it will catastrophically destroy most engines because the piston(s) will hit the valves. Belts overcome this problem - they don’t stretch. But the best way to stay on top of keeping a timing chain in spec is on time oil changes. The stretching throws off the valve timing and gives the engine control ECU poor data about the ignition timing, etc, because cam position is derived from crank position and assumes a limited amount of stretch in the chain (ie - the computer can’t tell the chain has stretched excessively, so it tells the spark to fire at the wrong time relative to the position of the valves). Chains do require measuring for stretch and tensioners checked for wear. Plus, they have different wear and failure mechanisms.īelts tend to fail by breaking without warning, hence they do durability testing in R&D and arrive at a conservative replacement schedule.Ĭhains stretch (ie - they give you some warning they’re getting ready to fail). If you operate under the false presumption that chains are better than belts, you’re denying reality, which is that both work just fine, but the detail of the design and the execution really matters. It highlights a fundamental misunderstanding of how engineering actually works - because there are good chain designs and bad ones. The timing chain also acts as a damper which dampens the vibration from the crankshaft. This can cause them to dry out, stretch, or crack and cause issues down the line. Deteriorates much more commonly than a timing chain. Timing belts are located on the outside of the engine, exposed to the air and debris around them. Pros of timing belts: Lighter and quieter than a timing chain. The timing chain can resist heat produced from the engine. However, they are much less expensive to replace than a timing chain, although a timing chain goes out much rarer. The life period of the timing chain is relatively higher than timing belts. Not trying to rip you a new one, mate, but I always hate it when people make statements like this: "Always been a big fan of chain over belt.” Timing chain has high strength due to its material and design.
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