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#31
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In fact the longer I go without changing the oil, the louder and longer the rattle becomes on cold starts. The new oil+filter has been good at reducing the noises. I'll report back if it's a consistent reduction for the next 3~6 months. I think I'm gonna shorten the oil change interval as well. I've been doing it once a year at around the 7,500 miles mark. Probably gonna do it every 6 months regardless of the mileage.
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2003 X5 4.6is Estoril Blue, acquired March 2018 2013 128i M Sport 6 MT Space Grey daily driver 2010 535xi 6 MT Barbera Red |
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#32
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Try the BMW filter? Try a different tensioner? Or try a different weight oil? Other than that I'm not sure there is anything you can do. Perhaps swap out the spring in your tensioner for a stiffer spring if you can find one (albeit that might be total guesswork and a potential risk). You know one thing I am curious about... why replacing the guides would actually do anything to quiet the noise? My understanding is that lack of tension on the chain causes the noise. But I guess if the guides are very worn that could cause reduced tension on the chain. Or perhaps the chain itself has become slightly stretched over time and needs to be replaced. I was talking to a BMW enthusiast (had a big BMW tattoo on his arm) at the auto store they other day and he said replacing the timing chain guides is not really that hard and people make too big a deal out of it. I'm eager to try it but unfortunately I do not have a garage. I'll need to wait for summer if I want to attempt the job outside. In the meantime I'm in the same boat as you. I'm hearing a noticeable rattle at startup and a mild rattle at idle.
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
#33
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But yeah, when weather permits I'll look into both the chain and the guide replacement. First thing on the list is a lift!
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2003 X5 4.6is Estoril Blue, acquired March 2018 2013 128i M Sport 6 MT Space Grey daily driver 2010 535xi 6 MT Barbera Red |
#34
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This is from a Lexus forum. Thought it was interesting and maybe relevant...
"Number one reason why plastic chain guides fail is because of improper chain tension. The older 20R wasn't more durable because it had metal guides, it was because they were running double row chains. The same year Toyota switched to plastic guides (1983), they also switched to single row chains. The chains eventually stretched more than what the tensioner could accommodate so the chain would bang against the guides. Of course once people see the plastic parts shattered, they attributed the problem being the plastic itself, rather than what caused the failure in the first place. When done right, plastic guides are not bad. There are plenty of engines out there without failures."
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
#35
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I'm just guessing but I imagine if your (or my) timing chain is slightly elongated then putting a slightly stronger spring in the tensioner might help. That would be an interesting, albeit maybe risky, thing to try.
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
#36
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Found a guy who did this on another forum and he said it fixed the problem. He put a stronger spring in his tensioner. It kinda makes sense. If your chain is slightly elongated then buying a new tensioner may not help because it will be speced out to match an in spec chain. If your chain is out of spec the theory goes, you may need an out of spec tensioner. I guess I would try a 3rd party spring that was just mildly stronger and if that did not help buy one just a little bit stronger, until the noise goes away. Assuming this actually works of course and assuming you are willing to take the risk.
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
#37
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
#38
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Could it be this one? https://www.ecstuning.com/b-genuine-...kaAhPHEALw_wcB If it's a simple matter of just swapping out the M62 spring with the M54 spring, that can be done easily.
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2003 X5 4.6is Estoril Blue, acquired March 2018 2013 128i M Sport 6 MT Space Grey daily driver 2010 535xi 6 MT Barbera Red |
#39
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Quote:
https://www.fcpeuro.com/products/bmw...Lw_wcB#fitment
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
#40
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I just bought the M54 spring. The M62 tensioner is coming in the mail in about 10 days. I will compare the two springs and post photos.
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2003 X5 4.6is. Imola Red. Black leather. Style 87 wheels. |
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