Cold Mornings ain't no fun
Grinding type sound coming from passenger side of Mini Cooper engine.
Right off the bat, if you watch the video, the noise happens the first time about 2 seconds into the video, and the second time it happens is about 10 seconds in. i think it does it a third time towards the very end (20 seconds ish) but it's nowhere near as loud (I think it's gotten up to a high enough temp at that point to negate the noise).
On mornings that are 10-15 degrees F or lower (and the car is ice cold, if it has any warmth to it and it hasn't been sitting for hours, it wont do it (sitting overnight, then starting it in the morning is the best way to catch it making the noise)), I have a noise that's coming from the left side of the engine. The only things in the area that noise is coming from is the timing chain, water pump, and alternator. I should mention this is an 06 Mini Cooper (non-s). The power steering pump is electric so i only have those two things running by belt as well as of course, the belt tentioner. This noise as you can hear in the video pulses randomly for about the first minute. It doesn't happen as it's starting, and it doesn't generally start until about 10-15 seconds after it's running (enough time to start it, then run in front and listen to it). I'm having a real hard time trying to determine the cause, i wouldn't figure its the timing chain as i'd expect that to be more of a rattle, and i wouldn't expect it to pulse like this is. The alternator is working perfectly fine (i have a live data scanner and it shows that it's making plenty of power, on top of that i don't have any of the common signs that it's going out on me), the water pump also seems to be working fine, car doesn't overheat at all. I flush my coolant yearly with prestone premixed 50/50, the green stuff. The tensioner bearing seem to be fine, the tensioner isn't shaking while it's running, and when i pull it back and roll it by hand, the bearing doesn't feel pitted (although i know a bearing needs load on it to know for sure if its pitted). The only thing i could think of is maybe the antifreeze ratio is wrong, however like i said, i bought this premixed. Maybe the coolant is starting to slush up when it gets down that cold and I'm hearing the water pump pumping slush so that's why its making this kind of grinding noise? I'm really not sure, and i'd rather not just start throwing parts at her if i can avoid it. I have noticeable valve tap you can hear when you stand next to the engine while its running with the hood opened, but i wouldn't expect this to be related to the other noise i'm hearing as the noise is isolated to the passenger side only. There really isn't much on that passenger side, just the alternator, water pump, belt tensioner, the abs module is on the passenger side but its back behind the engine and i can easily get to it, i can tell its definitely not coming from the abs module. Other than those things there isn't anything on that side that is moving when the car is parked and running. I hope you can help because i am absolutely at a lost on this one. Thanks so much for your help, love your videos!