If you have only ever known the 4-cylinder TDI and are now in the world of 6-cylinder diesels, your timing could be an issue.
4-cylinder diesel models use a timing belt. 6-cylinder models use a timing chain. The timing chain and timing belt systems have the same basic function: to hold the cam and crank in time.
The good and bad part of a timing belt is that they have a specific interval when they are due to be changed, based on the engine. On a 2015 2.0 TDI, you will need to plan to replace the timing belt kit every 130,000 miles; that is the bad part. The good part is that you know in advance when it needs to be done. Timing belt failures before the change interval are very rare.
Timing chains have no specific change interval. Manufacturers will often recommend checking the chain when the vehicle mileage reaches over 100,000. Unlike a timing belt, there are several indications that the chain needs to be replaced. It is not like a belt in that you only find out once it is too late.
As the timing chain ages, it will stretch some. The tensioner will take up some of this slack. At a certain point, it can no longer compensate. This would be the time for a new chain, tensioners, and guides. A loose chain creates a knocking or rattling noise. It can cause excessive vibration or shaking at idle. A loose chain can also cause a check engine light. It will often be a code for a bad cam position sensor. You may notice poor performance or even start-up issues. The best way to protect and get the most out of a timing chain is by performing regular oil changes with high-quality oil. We have seen engines with over 300,000 miles with the original timing chain that still run great.
The longer service life of the timing chain seems like it would make it the preferred option in your vehicle. The problem is that a timing chain replacement is often much more labor-intensive than a timing belt replacement. On some models, the chain is on the back side of the engine against the firewall, which requires the engine to be removed first. This is, of course, the most difficult one, and not all are this bad.
Which do you think is best? The predictability of a belt, or the extra-long life of a chain?
Diesel Timing Chain Kits
We understand how challenging it can be to locate all the necessary components for timing chain jobs. To simplify this, IDParts has put together Timing Chain Kits that come with all of the parts you will need. Each kit has fitment information and a description of what is included:
