4.4 4.8 Timing Chain Guide

[electricalserv x5]

good thead,don,t forget that the m62[4.4,4.6is] 00' to 03 have one timing chain and one tensioner and the n62 [4.4,4.8is]04' to 06' have two timing chains and two tensioner.
I went through this on my 4.6is what a fu=kin mess.I just gave up.
I have the 4.8is 06' love the x5 ,but I have my heads up for repairs '
I seen the vanos video ,wish I seen that before............good oil makes a big difference..

[carl0s]

I'm googling "n62 rattle noise" and I ended up here on the topic of chain guides again!

I posted a bit about the N62 chain guides previously on this forum. They did update the guides on that engine as well, and I can tell you that I had bits of plastic in my oil pan from them, and so they do fail on the valvetronic N62 engine as well!

I did end up replacing both sides in the end - heads off on the side that needed it to get the chain guide off, and head off on the other side as well 'cause it seemed stupid not to do the stem seals and secondary air whatsits at the same time.

some pics here:

http://www.xoutpost.com/948285-post16.html

Now, anyone know why my engine has an intermittent rattle from around the alternator area? It seems like it could be the idler pulley. i hope so! waiting to cool down to see. It sounds *bad*.

[Rockit]

Originally Posted by carl0s

I'm googling "n62 rattle noise" and I ended up here on the topic of chain guides again!

I posted a bit about the N62 chain guides previously on this forum. They did update the guides on that engine as well, and I can tell you that I had bits of plastic in my oil pan from them, and so they do fail on the valvetronic N62 engine as well!

I did end up replacing both sides in the end - heads off on the side that needed it to get the chain guide off, and head off on the other side as well 'cause it seemed stupid not to do the stem seals and secondary air whatsits at the same time.

some pics here:

http://www.xoutpost.com/948285-post16.html

Now, anyone know why my engine has an intermittent rattle from around the alternator area? It seems like it could be the idler pulley. i hope so! waiting to cool down to see. It sounds *bad*.

The timing chains guides break due to age and have zero to do with wear...very scary. Guys here have broken guides and only know it...I did and found it when I changed the valve cover gasket.

I have the same noise still, it's the vanos losing oil pressure from a bad seal. Beisan Systems - Procedures - M62TU Vanos Procedure

I'm going to post pictures of my guides that look new but broke because of defective material at 85k. I have an 2002.

Every timing chain guide repair also needs the vanos rebuilt no matter what.

[carl0s]

Originally Posted by Rockit

The timing chains guides break due to age and have zero to do with wear...very scary. Guys here have broken guides and only know it...I did and found it when I changed the valve cover gasket.

I have the same noise still, it's the vanos losing oil pressure from a bad seal. Beisan Systems - Procedures - M62TU Vanos Procedure

I'm going to post pictures of my guides that look new but broke because of defective material at 85k. I have an 2002.

Every timing chain guide repair also needs the vanos rebuilt no matter what.

Mine is N62 and has the cam-spocket type vanos adjuster unit, which is actually a reliable unit and I have searched and have never heard of a failure. I guess your M62 vanos units are the same as the M54 6cyl engine - those that require a rebuild with new teflon sealing rings & o-rings.