4.4 4.8 Timing Chain Guide

[Rockit]

I was doing some searching here and found the 4.4's 4.6 and 4.8's suffer from failed timing chains around 100-140k that render the engines useless. So I did some digging on the net. People here seem to think the guides just fall apart and fail due to age...I found the timing tensioner fails causing slack in the chain and the loose chain demolishes the guides. By the time you get the rattle noise or the power steering noise ...it's to late.

The solution is to change the tensioner at 90k

http://www.partsgeek.com/gbproducts/...Fel9OgodkCcAMQ

Bmw E39 540i timing guide chain tension er replacement e53 X5 4.4 - YouTube

My 4.4 has 85k...changing mine this week.