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  #1  
Old 09-10-2019, 12:53 PM
Rotorblade Rotorblade is offline
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I need some help regarding the timing chain. Until the oil reaches the nominal temperature there is a rattling noise that can be heard from the engine. It currently runs on motul 300V power 5w40...had the same issue with castrol 5w30 except it would warm up quicker. It starts from 1500rpm then if you go above 2k it gets quieter and reappears when you lift the foot off the gas pedal. It sounds like the chain of a bicycle when rotating the pedals backwards . When the engine gets hot the sound is hard to detect. I've already replaced the chain tensioner but nothing changed. I suppose this engine needs a timing chain replacement. Also I was wondering, it doesn't seem to be enough space in front to work at the chain, is it necessary to remove the front bumper, radiators and the metal elements body between the radiators and the engine?

The car is a 2008 e86 3.0si, 100k miles
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Last edited by Rotorblade; 09-10-2019 at 03:03 PM.
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Old 09-10-2019, 09:48 PM
Andyz4 Andyz4 is offline
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With only 100k on the car, I don't think its your timing chain. That noise could also be a dry or worn pulley bearing on one of the ancillary components. For a quick test, try running the car with the serpentine belt removed and see if the noise is still there.
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Old 09-11-2019, 02:29 AM
Rotorblade Rotorblade is offline
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Thank you.
I'll check with the mechanic next week. The car has 100k mileage but I also did 100miles on a race track. I've heard that they may need replacement between 100-200k km depending on driving style and maintenance. I bought the car at 150k km and the previous owner changed the oil at bmw recommended intervals which is not that good (2y/25k km)
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Old 09-12-2019, 10:14 PM
Andyz4 Andyz4 is offline
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I hear you but 100 miles on a racetrack should make no difference to the timing chain. Don't let him sell you a timing chain job before you try my suggestion.
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Old 11-06-2019, 11:23 AM
Rotorblade Rotorblade is offline
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Thanks,
I didn't check that alternator belt because it didn't seem to be related to the noise.
The car is now at the mechanic for the timing chain replacement and while they were preparing to assemble the components they found a missing oil pump sprocket securing plastic element that is now probably in the oil pan (they couldn't find it yet) that could've been the cause of the rattle.
The oil pump chain they say it doesn't need replacement. Is it better to replace it anyway considering the mileage 100k mi ?
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Old 11-07-2019, 12:43 AM
Andyz4 Andyz4 is offline
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Based on that info I wouldn't replace it. Sounds like you really dodged a bullet that with the missing retainer the sprocket didn't fall off. That would be have been catastrophic.
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Old 12-02-2019, 06:03 AM
Rotorblade Rotorblade is offline
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I got the car from the mechanic a few days ago. He has replaced the chain, guides and sprokets, seals and also the oil pan gasket and bolts, and the valve cover gasket.
I can still hear that chain running at before it warms up but it's a bit quieter. Before I could hear it even with the engine warmed up. Anyway the old chain doesn't look that bad. The rails/guides were as new. The chain has some lateral play between the pins and link plates like between 1 and 2mm for each link, but the in the longitudinal it has no play and not sure if it is stretched in that direction. The noise possibly came from side to side motion
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