2,3 Engine noise from timing chain ?? [Archive] - SaabCentral Forums

: 2,3 Engine noise from timing chain ??


johkar
5th January 2003, 02:55 PM
Saab 9000 CS 2,3 automatic 1992, 226 000 km

What i hear from the engine sounds not so good. As just started, cold engine sounds normal to my ears, but when it gets warmer, then the rattling begins. Earlier in the service they listened it and then changed one belt roller outside engine – didn’t help with the noise. In the service they said only “no problem if the noise gets not bigger!”

Well, i have driven now over a year from that time, and i can still hear the same noise when the engine gets warmer. Today i accidentally found the FAQs of 9000 where they talked about common timing chain problems, and got worried...

Would this be also timing chain noise from my engine?

Johannes

lawrence
5th January 2003, 06:22 PM
Johkar,
I also own a '92 9000, with 155,000 miles on it; I have come to the conclusion that it is high time to do the timing chain and sprockets, as well as the balance shaft chain. Big job, but it can be done by mere mortals.

johkar
9th January 2003, 02:12 PM
Ok, maybe it's the time. However, after readed some other posts here i understood that the timing chain noise will be ausible right after the cold engine has been started? In my engine, it takes about 10-15 minutes depending of the outside temp when i can clearly hear the rattle.

Also after reading the thread about broken AC compressor and noises, thought that it might be that, but the AC has been
working fine all the time and no smell of burnt...

Maybe i will make a short audio file of the rattle
later to be analyzed by wiser "engine-men"

Johannes

Matt Phelps
23rd March 2003, 01:00 PM
Similar problem here. I have(had) a loud rattle (sounds like a rusty chain or marbles in a jar) sometimes which I can hear clearly at idle. I've had it for the last 2/3000 miles.

I rung a specialist and he said not to worry because it sounds like the hydralic tappets and they all do that after a while. I only had a new timing chain just over 30K miles ago.

Funnily enough, just this week the noise stopped altogether. Ominous no?

Marrk
24th March 2003, 12:44 PM
I hate to be the possible bearer of bad news but did you change the balance shaft chain etc at the same time as the timing chain? The lack of noise now sounds like the balance shaft drive sprocket has shed all its teeth and the balance shafts have stopped spinning...but the toothless drive sprocket is slowly being worn down as it revolves against a static chain and is putting swarf into your sump. My engine lasted 20000 miles before total failure due to this mishap.
I don't know if you can see if the chain is revolving with the cam cover off, worthwhile checking with a mirror on a stick maybe, but I would check the sump for bits of metal and teeth when you change the oil!

Matt Phelps
28th March 2003, 03:50 PM
Well I have no idea if it is related to this problem or not but my belt tensioner has just sheared completely off the engine block. The first clue was loss of power steering. The entire thing has literally snapped away from where it was attached to the block. I found one snapped bolt near the car.

I don't know whether this is related or not - maybe the rattling was a loose bolt?