Engine kncking/rattling - Alfa Romeo Forum
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(Post Link) post #1 of 3 Old 16-08-16 Thread Starter
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Engine kncking/rattling

Hi there!

Iv'e read a lot on this, but can't make up my mind on what to do.
I just bought an 2006 Alfa 147, 1.6TS 105HP With 91000km on the clock (about 60000 miles)

The engine has a slight knocking noise. I hear it on idle, it seems to follow the revs, but gets more apparent as the revs fall.
I'm not able to say if this is top or bottom end problems. The sound is a bit higher when I lay under the car, so I suspect crank bearings.

BUT: In my experience, with bad crank bearing/rod Knock it gets bad fast. This have been the same for about 2000km with mostly high speed highway driving (3500-4000 rpm) and some city-driving. It does not get any louder or worse. The other thing is that on idle the noise disappears from time to time, its there for some seconds, disappears for some seckonds and get back. I would believe that rod-knock would be more consistent?

The other thing I suspect is a bad aligned timing-belt. Previous owner had it replaced, the old one was in he trunk when I bought it. But I got a feeling this was a garage job, witch is never good... Could this cause the knocking?

Could also be lifters. Tried the 15-15 second interval rev-thing I found here, and it got a bit better, but came back after a day or two.

What do you guys think?

Thanks for any help and suggestions!

Fredrik

Last edited by mach1frh; 16-08-16 at 10:02.
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If it were bearings damage, the oil would be full of debris and it would not last so much kilometers.

Without hearing the noise, it is difficult to give an opinion, so who knows...regarding to the belt, to make that noise, the valves need to touch the pistons, that would affect to engine start, and of course, make serious damages...


The noise gets louder with hot engine?
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(Post Link) post #3 of 3 Old 17-08-16 Thread Starter
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Hi there! And thanx for Your reply.

No, the noise is mostly the same, both hot and Cold engine.

Se you live in Spain, so do I, despite being Norwegian!
Lots of Alfa's down here, but not much love for them
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