Timing chain & more

[montmil]

Input from experienced hands needed.

Would you recommend replacing the noted bearings during the timing chain replacement ordeal?  I have a nagging suspicion that part of my worrisome noise problem may include these items... particularly the flange bearing.

I don't think the ball unit would be generating the noise I'm hearing.

Flange Bearing - #4 in diagram:

http://www.realoem.com/bmw/showparts.do?model=0364&mospid=47851&btnr=11_1697&hg=11&fg=30

How about the big ol' ball bearing, too? #8 in the diagram:

http://www.realoem.com/bmw/showparts.do?model=0364&mospid=47851&btnr=11_1716&hg=11&fg=25

Thanks. I'm planning a parts order and once I get into this deal I don't want to be slowed down.   Monte

[Bob_Roller]

How many miles on the bike ?

[nhmaf]

Are you planning to replace the sprockets?  If the teeth have gone really pointy at the ends or have developed a "hook" shape or significant wear pattern, its best to replace them as well with the new chain.  If you're pulling the sprockets off, I don't know if there is too much more work  to get to the bearings..

[montmil]

Mileage unknown as the dreaded non-functional odometer was included with the bike's purchase. From condition, I'd guess around 40K.

Haven't seen the timing chain sprockets or other components as the bike has not yet been opened up.

Besides the chain itself, I'm wondering about the flange bearing. Since it's a bushing, it would seem to be more prone to wear than a ball bearing...?

Read the Snowbum timing chain tech article. Still trying to sort out the wheat from the chaff in that one! Couple other internet articles and the latest on our R65 site.

Trying to get prepared; hoping for the best but expecting the unknown...

Monte

[Bob_Roller]

I replaced my chain around the 40-45,000 mile area, and the sprockets and chain tension-er parts were in great condition.

Unless the bike was really abused, I don't think the front crank shaft bearing, or cam bearing is going to be in need of replacement.

These engines are good for over 100,000 miles before any real attention is needed for the 'bottom end'.

The reason I replaced mine then, was because of a vibration I had, replaced the chain, no help, it was the beginning of the transmission bearing issues that were brought on by water in the transmission.

[montmil]

...Unless the bike was really abused, I don't think the front crank shaft bearing, or cam bearing is going to be in need of replacement.

These engines are good for over 100,000 miles before any real attention is needed for the 'bottom end'.

Thanks, Bob. I'm feeling the love here.  [smiley=2vrolijk_08.gif]

[steve hawkins]

Actually the bottom ends are good for almost 200,000 miles if you treat them right.

I would not pull a bottom end apart for any reason.  If it is bad I would replace it, it would be cheaper.  But then thay are that long lived I probably will never have to.

But I have to agree with every thing else Bob said.

My timing chain was replaced at 94,000 miles - again only the chain.