VW POLO 2018 1.0 3 CYLINDER. VVT BOLTS LOOSE

[TTRACES46]

Friends daughter has a 2018 Polo 3 cylinder 1.0 95PS. Think the engine is designated CHZL. Brief outline of problem. Noticed oil spots on driveway and strange ‘clanking’ sound when engine running. Contacted VW warranty. Car 9 weeks past 3 year warranty. Outcome was, had to get car recovered to VW main dealer. Discovered 2 of 5 M6 bolts had fallen out of VVT adjuster on end Exhaust cam. One further bolt hanging out and grinding against cam wheel cover. After negotiation, VW agreed to pay 50% of cost, but it cost the dealer far more as the cambelt was fraying, and had to be replaced, along with the tensioner. The fallen bolts were found in the bottom of the cambelt cavity, next to the camshaft pinion. VW knew of the issue in June 2020, a year ago. I found a report on their erWIN reporting system, but VW are adamant they don’t have any issues, although I’ve had it on good authority, that this is not a one-off (proven by the erWIN report). Does anybody know of anybody else who has had the same issue? VW had a similar issue with the inlet cam wheel bolts on an earlier version of this engine, which resulted in a DVSA recall.

[Captain_Morgan]

Hello welcome to the forum.

[Andrew Stacey]

Just had this with an Ibiza fr 1.0 tsi. It was just one bolt that had made a bid for freedom but the others weren’t tight.

[lost in espace]

Andrew Stacey said:

Just had this with an Ibiza fr 1.0 tsi. It was just one bolt that had made a bid for freedom but the others weren t tight.

My son had a 2020 Golf 1.0 TSI, can you point me in the right direction how to check these bolts? His idle is a little lumpy.

[simion_levi]

This shows it fairly well:

https://www.youtube.com/watch?v=WwuheZCfBxM

There is a similar issue with 4x fuel rail bolts (very same bolts) coming loose/breaking in certain EA211 engines, due to them not being torqued up correctly in the factory.

[lost in espace]

simion_levi said:

This shows it fairly well:

https://www.youtube.com/watch?v=WwuheZCfBxM

There is a similar issue with 4x fuel rail bolts (very same bolts) coming loose/breaking in certain EA211 engines, due to them not being torqued up correctly in the factory.

Fantastic thanks, we got the cover off but I thought we were looking for something else. We did get some oil come out from inside the cover anyone know if this is normal?

[hengti]

Oil is behind the cam variator cap (the part that sheds its bolts) but shouldn't be in the cambelt housing beneath the plastic cover.

[lost in espace]

hengti said:

Oil is behind the cam variator cap (the part that sheds its bolts) but shouldn't be in the cambelt housing beneath the plastic cover.

Thanks very much.

He has a 1.0 TSI 2020 Golf and having had another look the design has changed the left sprocket has bolts that come in from the other side. There is a gasket and seal on the cover plate to retain the oil which presses against the right cam sprocket, when we removed this a little oil came out under pressure.

Thanks for your help though prompted us to look again, we found a cracked pipe along the intake pipe that connects to the intake manifold sensor. It has been idling rough and since we sealed that up now perfectly.