N57 timing chain?

N57 timing chain?

Author
Discussion

JonDerz

Original Poster:

156 posts

141 months

Sunday 3rd November 2024
quotequote all
I gambled on a high mileage 435d 2014 at the auction last week on 180k rotate

The car actually drives well, however on cold start there’s a chain like clatter that appears when the engine is revved, and gets worse with higher revs. But there is zero clatter on cold start up and cold idle, only when revved. It goes completely when warm. Surely its chain stretch that I’m assuming is audible when load is placed on the engine but I’m not sure why there’s no sound when starting up. Thoughts?

https://youtube.com/shorts/KP0YJoRkSWE?si=zLD3VXti...

Edited by JonDerz on Sunday 3rd November 16:12

rassi

2,503 posts

265 months

Monday 4th November 2024
quotequote all
When cold, the chain is slightly shorter, and the chain tensioner maybe tighter, whereas warmed up everything is stretched a bit?

danb79

11,570 posts

86 months

Monday 4th November 2024
quotequote all
JonDerz said:
I gambled on a high mileage 435d 2014 at the auction last week on 180k rotate

The car actually drives well, however on cold start there’s a chain like clatter that appears when the engine is revved, and gets worse with higher revs. But there is zero clatter on cold start up and cold idle, only when revved. It goes completely when warm. Surely its chain stretch that I’m assuming is audible when load is placed on the engine but I’m not sure why there’s no sound when starting up. Thoughts?

https://youtube.com/shorts/KP0YJoRkSWE?si=zLD3VXti...

Edited by JonDerz on Sunday 3rd November 16:12
Have a read here: https://f30.bimmerpost.com/forums/showthread.php?t...

JonDerz

Original Poster:

156 posts

141 months

Monday 4th November 2024
quotequote all
rassi said:
When cold, the chain is slightly shorter, and the chain tensioner maybe tighter, whereas warmed up everything is stretched a bit?
Wouldn’t that mean it’s noisy when warm if it’s stretched? There’s no noise when the engine is warm, or at cold idle, only revved when cold

rassi

2,503 posts

265 months

Monday 4th November 2024
quotequote all
JonDerz said:
Wouldn’t that mean it’s noisy when warm if it’s stretched? There’s no noise when the engine is warm, or at cold idle, only revved when cold
Indeed, I read it too quickly, as if the noise was only there when warm. Still, the tensioner could be bad, and the chain ok.

DS900

8 posts

6 months

Sunday 15th December 2024
quotequote all
Any 435d is likely to have a had a reasonably hard life, especially across 180k. If it were me I’d look at having the chain replaced at some point anyway and you’ll doubtless have plenty of life left in it. Any evidence of the chain having been done?