Technical flat belt noise when starting engine

[reinibabs]

when i start the engine i have a noise coming from the ( belt tightener)for about 10 sec and after it leaves .looking to it,it seems like its tightning the belt and losing it again.??????

what is this????

fiat doblo 1.9 105 horsepower 2002

 

[Ulpian]

This can happen. Mine was doing it a month or so ago, when it was really cold. I do various length trips in the dead of night, assaulted by salt spray and all the filth of a British winter. Now that it is warmer the noise on start up has gone. I am hoping it was just salty moisture on the belt system...

Or, it can be a problem with the ancillary drive belt and its sprockets and tensioners etc..

When my car was less than three years old the whole belt system collapsed with a bang and a clatter, due I think to a failed guide wheel or tensioner I was able to limp into the garage (not far away) without any power steering and they replaced the whole gubbins quickly. This is a known 1.9 JTD problem unfortunately.
You might take it in and ask a tech what he thinks - I would.

 

[mingsect]

in singapore, it happened to the facelifted 1.9 mjet also ..

 

[sludgeguts]

Is it hydraulic tensioner or simply a wheel on a spring-loaded arm?

I have had a hydraulic tensioner fail on another motor - mainly due to the previous owner not changing the oil, so the oilways become gunged.

 

[Ulpian]

I think its a mechanical fault. Nylon bearings/wheels failing under load - sorry, but I can't remember what the man said. It was done under warranty, and does happen! I'm sure I remember commenting that if they still used metal components instead of plastic these failures wouldn't happen. My oil was clean and I keep the car properly serviced.