Who's knocking?
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4th Gear
Joined: Jun 2006
Posts: 303
Likes: 5
Who's knocking?
Started my R53 (135K miles on it) this morning and heard a nice knocking sound. Opened the bonnet and took a short video. After a short while, it went away (as you can hear it towards the end of the video).
What could be the reason for this knocking? Did it go away because the oil pressure reached a certain point?
Thanks!
PS: When I was playing the video while posting this, my 4 year old said "MINI sounds like a helicopter"
What could be the reason for this knocking? Did it go away because the oil pressure reached a certain point?
Thanks!
PS: When I was playing the video while posting this, my 4 year old said "MINI sounds like a helicopter"
Thread Starter
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4th Gear
Joined: Jun 2006
Posts: 303
Likes: 5
It didn't take too long for it to stop. It's been parked overnight, I started it, heard the knocking and took a video in about a minute, then it stopped around 2 minutes. Is that enough time for warm-up?
I have no clue what the dollar bill test is, but I'm Googling it now.
OVERDRIVE
Joined: Mar 2013
Posts: 5,489
Likes: 629
From: Fuquay Varina, NC
You can test for a burnt valve by putting a dollar bill behind the muffler. If the bill flutters, the valve is burnt.
My ears are not the best now, too much hunting as a kid, but I could hear something clunking on your car. Do this, on a cold start, put your hand on the far left side of the valve cover, if the timing chain is banging around I would think you could feel it. The chain tensioner that works off oil pressure may be shot.
My ears are not the best now, too much hunting as a kid, but I could hear something clunking on your car. Do this, on a cold start, put your hand on the far left side of the valve cover, if the timing chain is banging around I would think you could feel it. The chain tensioner that works off oil pressure may be shot.
5th Gear
Joined: Feb 2017
Posts: 648
Likes: 38
From: Chicago
You can test for a burnt valve by putting a dollar bill behind the muffler. If the bill flutters, the valve is burnt.
My ears are not the best now, too much hunting as a kid, but I could hear something clunking on your car. Do this, on a cold start, put your hand on the far left side of the valve cover, if the timing chain is banging around I would think you could feel it. The chain tensioner that works off oil pressure may be shot.
My ears are not the best now, too much hunting as a kid, but I could hear something clunking on your car. Do this, on a cold start, put your hand on the far left side of the valve cover, if the timing chain is banging around I would think you could feel it. The chain tensioner that works off oil pressure may be shot.