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Old 09-01-2018, 02:19 AM
Rotorblade Rotorblade is offline
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18d timing chain maintenance

I have a 01/2012 sdrive model and I've heard about timing chain problems. They tried to fix it with the second batch but apparently these still have problems. The car is now 55k km and it doesn't make any unusual sounds yet. Shoud I preventively replace the timing chain now, wait to do more km or wait until it would start to make rattling sound ?
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Old 09-09-2018, 03:54 PM
Yukoner Yukoner is offline
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Originally Posted by Rotorblade View Post
I have a 01/2012 sdrive model and I've heard about timing chain problems. They tried to fix it with the second batch but apparently these still have problems. The car is now 55k km and it doesn't make any unusual sounds yet. Shoud I preventively replace the timing chain now, wait to do more km or wait until it would start to make rattling sound ?
Thanks
It's not the chain itself that fails, it's the chain guides (at least that's my understanding), which causes the chain to stretch. Replacing the chain itself won't do anything to prevent the failure. The chain should last several thousand kilometers.

My understanding is that the "preventative" replacement of the affected parts, when factoring in labour, isn't really worth doing.

If I'm wrong in any of this, I'm sure folks who know better than me will chime in
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Old 09-10-2018, 09:33 PM
Rotorblade Rotorblade is offline
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Thanks.
I'll start by halving the oil change interval which is recommended regardless of the problem. Some say it helps.
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Old 09-11-2018, 09:23 AM
Yukoner Yukoner is offline
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Thanks.
I'll start by halving the oil change interval which is recommended regardless of the problem. Some say it helps.
I've also heard that keeping the intervals within spec (or earlier) is better. Also not rat-bagging your car will help. But, in the end, it may just be a roll of the dice as to whether yours fails or not. It's a known issue, but I don't think it's THAT common. Like I don't think your odds are 50/50 or anything nearly that grim.
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Old 09-19-2018, 11:12 PM
caswallan caswallan is offline
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rat bagging? what is that?
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Old 09-20-2018, 08:47 AM
Yukoner Yukoner is offline
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rat bagging? what is that?
Ratbagging
Used primarily in the motor sport world to describe the act of unnecessarily abusing of a piece machinery.

Can also be used to describe any type of destruction or recklessness when performing any given activity.
Don't buy that Camaro, Deaner. I saw Tron ratbagging on it pretty hard when he had it.

Let's get drunk as **** and go ratbagging
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Old 10-30-2018, 08:32 AM
timgray timgray is offline
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The preventative maintenance is simple. Change your oil.

it seems that most cases where the chain guides failed was people doing extended oil change intervals. Change your oil every 7500miles with 0W40LL01 and you will be golden.

Note 0W40 is the new recommendation for N20 turbo engines from BMW themselves. and LL-01 is still currently the best lubrication standard as reported on reliable oil analysis sites.

The percentage of chain guide failures are very low compared to the number of N20 engines on the road. Remember, BMW has stupid long oil change intervals. Get an oil analysis done and then remove a few thousand from their recommendation for a safety margin.

I'm at 7500 miles as that is a every 6 month oil change for me.
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Old 10-30-2018, 10:46 AM
Rotorblade Rotorblade is offline
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Thanks,
I did the bmw recommended oil change at the dealer with bmw (castrol then shell) oil ll04, and in my case I changed the oil every 2 years with 15k km until after 4 years I noticed the oil was black 1 year after the oil change, which is actually normal for diesels, and started to charge the oil every year with less than 10k km done per year. This year I've chosen the castrol professional 5w30 fst instead. Now the car has 55k km.
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Old 10-30-2018, 11:06 AM
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DBU DBU is offline
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Quote:
Originally Posted by Rotorblade View Post
I have a 01/2012 sdrive model and I've heard about timing chain problems. They tried to fix it with the second batch but apparently these still have problems. The car is now 55k km and it doesn't make any unusual sounds yet. Shoud I preventively replace the timing chain now, wait to do more km or wait until it would start to make rattling sound ?
Thanks
BMW has used at least three different Timing Chain Tensioner in their 4 cyl turbo engines. I am not intimately familiar with the engine in your 1.8d, but it should be a relatively simple job to change it. I changed mine (N20 motor) and posted a DIY.

Also, the warning sign/sound is not a "rattle" sound but rather a RPM dependent "whine" sound. There is a sound clip on the internet that BMW actually use to diagnose this issue.

Finally, have a look at this blog: https://bmwtechnician.com/about/ and search there for "Timing Chain." Lots of useful info there, incl. the infamous sound clip.
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Last edited by DBU; 10-30-2018 at 11:09 AM.
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