F8X S55 Exhaust Cam Ledge Bolt Replacement - COLD START KNOCKING SOUND FIX
Vložit
- čas přidán 28. 08. 2024
- Hey guys! Today I tackled replacing my exhaust cam ledge bolts which were torqued incorrectly from the factory. Feel free to ask any questions here if you have any or post them on the forums at the link below!
All the information such as links and torque specs are all listed on this forums post.
f80.bimmerpost...
Thank you so much for the video! Same issue on my N55. Been looking for a DIY.
Good explanation
Good video man 🙏
The camshaft is most likely beaten up just like the camshaft case it's running in. Usually you should replace everything since the scratches will cause high wear and tear due to bad oiling even after fixing the alignment
@@skudnu5462 ideally, yes, if you can lock timing you should inspect the cam for damage and replace if there is any damage. I caught it pretty early on mine. However, this is the puma procedure.
Hello, thank you for the video. I also have the same problem. Do you only change the 15 sties and remove the problem? And you know why the noise is produced. Thank you, greetings
@@maxelito1000 yes replacing the bolts fixed my issue. The issue is caused by the bolts not being torqued correctly from the factory
@@j.varghese Hello, the torque change was made, it was a success, thanks for the video.
Where did you print the paper instructions to do this?
@@illwil1005 these were printed from ISTA
Makes me wonder if the N55 had the same issue, my F10 535 had that same noise on cold starts. I don't have the car anymore but I'm curious.
Hi, from what i know and also on my N55, is the kind of the same issue but less pronounced.
@@s7efan90 Yeah when I had my 535i, I could hear the tick out of the exhaust. It goes away after a period.
nah N55 has a different camshaft design, not a problem
@@skudnu5462 There was a guy who had a n55 and had the same issue as s55.
mileage on this car?
if renewing the bolts doesn’t work u need to replace the exhaust camshaft + bearing block too
45k on my car
Was there a recall for this issue? What year(s) of S55 had this problem? If none of the bolts were loose, I don't see how they could have caused noise.
No recall but there used to be a tsb. Covered under warranty if you have it. I believe all years could be affected.
@@j.varghese I just had my out of warranty 2018 done last week. It costed me $3785. Its fixed now but they did exactly this.
I’m new to cars and stuff haha. I had a question.
Is it fine to cold start the vehicle and immediately put it into gear to move it a few feet? Like brake coast to one spot to another?
Is it fine to cold start and drive but drive it moderately and like a grandma until the oil is up to temp?
Or should I wait some time?
@@ouzayaza5921 the manual says to start driving moderately as soon as you start the car. I personally wait for the Rpms to drop after cold start.
@@j.varghese should I keep it some rpms low?
@@ouzayaza5921 yes. I think under 4k is recommended
@@j.varghese do you believe it’s better to warm it up as fast as you can or as slowly as and moderately as you can? Also last question. Is it fine to drive on a highway with a cold engine as long as your rpms are low 4K RPM and below?
@@ouzayaza5921 moderately as the manual states. And highway is fine
Hi. Do you think the new bolts are essential? Just re-tightening is not enough??
They are stretch bolts so yes. They should be replaced. They're not expensive so might as well do it.
@@j.varghese Thanks for your very helpful advice!!
What is the cause again
15 bolts over torqued from the factory. If you're under warranty they'll cover it but if you're out of warranty it's like a $3k job in labor
Did you find one or multiple loose on removal or was there nothing obvious? I had mine fixed under warranty.
@@ps2cho nothing obvious but some of them were difficult to break loose.
@@j.varghese I still think the cause all over the forums is just a guess. Tons of people are saying its due to loose bolts causing the cam to rattle, but if youre saying they are all tight then I wonder if is the opposite and overtorqued, over time metal expansion or change in wear patterns makes the tolerances too tight and causing the noise? Interesting.
@@ps2cho my best guess is over torquing stretched the bolts a little too much which means the threads on the bolt are further apart than the threads for the cam ledge. So that little extra stretch could be causing it.
You know that your "repair" will one day breake your engine ? The noise occurs because the camshaft is rubbing on the bearing housing. So your camshaft has wear marks. yes BMW does it that way but why does BMW do it that way? because you don't want to invest thousands of euros in recalls. At first you don't hear anything. After 30-40-60,000km you have engine damage. But you won't have the car for that long, so I think the next owner will be happy
@@danielp3287 out of everyone that has performed this fix, not a single one has had issues since. Do some more research.
@@j.varghese yeah .. how long ? you seol the car after 2-3years and then ? but yeah who cares for the new owner ..