Re: Timing & Balance Chain - signs of a failure coming - Saab 9000 Bulletin Board - Saabnet.com
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Re: Timing & Balance Chain - signs of a failure coming
Posted by saabaru (more from saabaru) on Thu, 15 Jan 2004 07:20:00
In Reply to: Timing & Balance Chain - signs of a failure coming, Erik, Thu, 15 Jan 2004 03:41:30
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Do you mean 170K miles?
Balance chain failures on the B234 engine, which your car has, tend to occur over 120K miles, usually without warning. Chain noise, heard at idle, might be a clue, but the timing chain can become noisy. The balance chain main sprocket was not made of hardened steel prior to '93, so you're in better shape there, but failures have occurred on later models. The chain and sprockets are only visible if you remove the timing cover, which is the big metal plate on the end of the engine opposite the transmission. It's a big hairy job, but there is a good writeup on it on this site. The Haynes manual isn't bad for this, either, but the writeup clarifies some things.
If you do the job, buy the chain, chain guides and main sprocket, but the balance shaft sprockets themselves don't seem to wear. Replace the timing chain, its tensioners and sprockets (3) as well. It's also a good time to have your alternator rebuilt with new bearings and possibly replace the water pump, as well. Oh, and the lower engine mounts are easily accessed during this repair.
posted by 66.170.4...
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