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Originally Posted by anandpadhye WHat are the signs that indicate belt tensioner is going to fail? Mine has done 50000km and 7.5 years old. I will like to keep a close watch on any symptoms you will suggest. The service center is useless. Their attitude is "if it hasn't failed, why are you asking" types! |
To be honest, most of the cases of timing chain tensioner failures happens without any warning, as you would have read in the briskoda thread discussing the same. In India, the failure rates are not known or minimal simply cause of the lesser number of TSIs sold here. Also it is worth pointing out that VW/Skoda never officially issued any recalls for timing chain tensioner failures. For the cases abroad, the failures were either within warranty period or supported under goodwill. Hence also the reason why the Skoda ASC is unaware of such a problem.
In our car, I had felt a small abnormality in the engine note. A slight metallic scratching noise, which was audible inside the cabin only if the AC blower & sound system was switched off. I pointed it out to the ASC, initially during the EW period itself, but they were not able to diagnose it properly. They suspected a possible rattle of oil pump drive chain, but was not sure and kind of dismissive of the problem.
At a later point of time, vehicle was taken to the workshop for an abnormal sound from the auxillary belts (turned out to be only due to some water that fell on the aux-belt). I asked the source of the other sound to be checked thoroughly. It was found that timing chain tensioner had partly lost it intended tensioning capability, and resulted a minor slack in the timing chain. The timing was not affected, but the chain tension was. This caused the timing chain to rub against the outer timing cover (a thin aluminium plate) and was causing the abnormal engine note. No errors recorded in the diagnostic systems. So I would consider ourselves quite lucky to have spotted this early. The failure of the same tensioner would have gone un-noticed if I simply had an exhaust mod, the difference in engine note was that vague. In fact it missed the ears of my father and brother who drives the car regularly. But since I get to drive the car only after every odd 4 months, I notice such changes quickly, which might have been otherwise gradual for daily users.
I am posting the service bills for the parts that were changed. Since for detailed inspection, they virtually had to take the engine out of the car, I asked for replacement of PCV system also to the latest revision. Skoda initially approved for only Rs.10k as goodwill. Later after escalation and support from the ASC, a net goodwill support of approx Rs.33k was provided on the total bill. In our car, timing chain+tensioner, oil pump drive chain+tensioner, and timing chain cover was replaced with their latest iterations, and supported under goodwill. Additionally I asked for the PCV system and slightly faulty vaccum acutators also to be replaced, costs of the same were borne by us.
Below was the initial estimate of repairs that was provided by the ASC. Highlighted in red rectangle are those part and labour components which were later supported under goodwill. The remaining cost was borne by us.
The part numbers are for the latest revisions of the respective parts (where applicable). Timing chain tensioner, timing chain and timing chain cover are the critical items I would consider replacing for peace of mind in the 1.8TSI. The cost of the parts plus labour would come around Rs. 25k. Also worth noting that if the Skoda ASC used standard labour codes, the actual labour charges for a timing chain+tensioner replacement is quite cheap.
And below is the schematics of the complex multi chain arrangement of a 1.8TSI engine. Three sets of chains, respective tensioners, guide rails and more. German things
