BMW 740iL Timing Chain

if the timing belt or chchain is going out i wouldnt until it is fixed. if that goes out then say goodbye to the engine. its a simple fix

there is a timing chain in the M62 motor.
this might be a tensioner issue, and may be a lifter issue.
without hearing the noise myself it is not possible to be accurate.
as far as being worth it, it is practically impossible to say
from where I sit.
send me a PM and lets talk about it on the phone.

In my oppinion BMW made an engineering oops. Rather than use an idler gear, they use a guide rail to deliver the chain from passenger to driver side intake cam. The guide rail is "U" shaped and has alot of stress on the bottom of the "U". When the wear becomes excessive the timing chain tesioner piston becomes extended beyond its working range. The result is the tensioner looses its oil pressure. The determining factor would be to line up the two intake cams. If the cams are out of sync you have your answer. It is a costly repair to replace the guide, $2,500-$3,000. I found another solution.

thanks for sharing!

[quote:a335b57200="scott poole"]In my oppinion BMW made an engineering oops. Rather than use an idler gear, they use a guide rail to deliver the chain from passenger to driver side intake cam. The guide rail is "U" shaped and has alot of stress on the bottom of the "U". When the wear becomes excessive the timing chain tesioner piston becomes extended beyond its working range. The result is the tensioner looses its oil pressure. The determining factor would be to line up the two intake cams. If the cams are out of sync you have your answer. It is a costly repair to replace the guide, $2,500-$3,000. I found another solution.[/quote:a335b57200]

What was the final solution?