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Technical (156)
 Alfa Romeo forum : Technical (156)
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alfanatix
Junior Alfisti
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Posted: 10 April 2007 at 20:29 | IP Logged Quote alfanatix

I've started getting this engine rattle on my 2.0 TS 2000 model (also around 3000 Rpm) and followed DavidC's advice. Checked the exhaust bracket and found it to be broken. Couldn't get a replacement so I had to have the old one welded while they ordered a new one. Fitted the fixed bracket and unfortunately the noise is still there. I even checked the bracket to see if it had by any chance broken again but no such luck.

It's quite strange that it only happens when the car is warm. If I rev the engine the noise comes at about 3000 rpm and then disappears. It's very hard to keep the noise to try and pinpoint it. It definitely sounds like it's coming from the engine. It also sounds like pinking but sometimes sounds like (the only way I can explain it is on the old Alfas that had timing chains), it sounds like the chain needs to be retensioned.

I'm taking it to the agents tomorrow but I thought I might find some advice here.

Cheers,

Peter.
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da tony b
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Posted: 10 April 2007 at 20:33 | IP Logged Quote da tony b

you checked the laughing sprocket and giggling pin i presume?

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michaeld
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Posted: 10 April 2007 at 20:34 | IP Logged Quote michaeld

I wonder if the downpipe is broken or else the heatshield is loose (Is there one there?).


Broken cat?



Watch out...Tony's been on the beer again.



Edited by michaeld on 10 April 2007 at 20:43
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alfanatix
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Posted: 10 April 2007 at 20:46 | IP Logged Quote alfanatix

Checked the downpipe and heatshield. Even checked all the other brackets etc but can find nothing loose. it certainly sounds like it's coming from the engine.
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da tony b
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Posted: 10 April 2007 at 20:48 | IP Logged Quote da tony b

get a mate to sit in car holding it at different revs.from say 2000 -4000
and use long screwdriver held against engine and next to ear

you will be amazed at this old school trick for hearing and tracing noises

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alfanatix
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Posted: 10 April 2007 at 20:49 | IP Logged Quote alfanatix

Just tried that and it still sounds like engine.
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da tony b
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Posted: 10 April 2007 at 20:51 | IP Logged Quote da tony b

might help you pinpoint loudest noise

hope its not a little end problem mate

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alfanatix
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Posted: 10 April 2007 at 20:54 | IP Logged Quote alfanatix

I hope so too. I'll be very surprised if it's bearings. The car has never missed a service, always had the oil level checked and has never been driven hard.

Would bearing noise be affected by engine temp? As I said the noise only comes after the engine is warm.
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da tony b
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Posted: 10 April 2007 at 20:58 | IP Logged Quote da tony b

oil thins down etc

to be fair ive not heard of one single ts doing in the little ends

although many have shagged there big ends

havnt had the cam belt ever break on her have you?

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alfanatix
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Posted: 10 April 2007 at 21:02 | IP Logged Quote alfanatix

No. Never had any serious problems. The only thing that I've been thinking about is the noise sounds very much like a faulty variator at start up. The only difference is that this is when the car is running and is warm. The sound is very similar.

I had a new variator fitted about 9000 km ago.
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chainsaq
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Posted: 13 April 2007 at 18:46 | IP Logged Quote chainsaq

Hate to say this:
My 156, 2 litre TS, also 2000(X) had this exact thing. Tapping/rattling noise between 2500-3000 rpm.

Big end bearings. Easy to see how bad they are, not so easy to fix. If you feel up for a challenge, drain the sump and take it off (few other bits need to come off first) and undo a big end or two. If they look shagged, they probably are.

I took my engine out, rebuilt the damn thing, new bearings, rings, everything that could be replaced pretty much was. Crank re-ground and o/size bearings fitted. Started first time and runs like a dream. No noise!

Let me know the outcome, i'd be happy to advise if you're looking at fixing the problem yourself.

Roger H
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SJ156
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Posted: 13 April 2007 at 18:59 | IP Logged Quote SJ156

could it be the lower engine bush ?

i had a horrible noise coming from the drivers side @ about 3k. the garage first thought it was the arb knocking but after a few test runs & ramp inspections, have said its the lower engine bush


in fact im doing the job today but the feckin' old bolt isnt long enough
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