CSL crankshaft bearing shell

[Chad]

Originally Posted by Monkey

Hi Chad,

Can you feel that pick up with a sharp pick? or your finger nail? If so it would need some attention. You'd also have to measure it with the plastiguage to see if its excessively worn, and to determine which shells you put in when you put it back together.

Hi James. Yes you can definitely feel some light pickup with finger nail, but doesn't appear to affect measurements, As in photo, interesting thing pickup arrears to be mainly on rod bearing 3 and 4. Also mains bearings either side and centre, appear to take the most abuse. And sprocket side no 1 main bearings is slightly the most warn . Out of interest, a a local engine shop recon this pickup on crank bearings faces should polish up perfectly, out of interest including some photographs , measurements taken and close up photos ..what's your take on measurements, regarding shells! I'm thinking refitting std shells...

[Chad]

Sorry more pictures. This motor and crank spun a shell at about 70 or 80k miles. New shell fitted ran on for another 20k ..but can't remember which one spun .

[Chad]

Imagine of shells. From rod 3 and 4. Definitely more wear to these shells, which coincides with pickup on bearing faces 3 and four, ... Would be interested to hear if this is typical of csl or std m3. Other rod shell don't look to bad, and this coincides with other crank bearing faces being fairly pickup free, ... also noticed most of wear appear to be or the rod shell , bottom shell definitely have less wear in general, ... pictures shows rod 3+4 first. I've definitely seen shell bearings looking a lot worse, so can only imagine once you can see the copper colour on shells there will be a fair amount of pickup on crank faces, pity BMW don't do some kind of temporary shell that can be fitted to polish up crank faces and be then removed......Hopefully of interest to someone

[niall1]

I recently hit 70k miles in mine and as it's no longer my daily I thought it better to have some preventative maintenance with a bottom end rebuild at this service, as I had read about issues with these engines around this mileage. The car has always been regularly serviced and has only done a handful of track days in it's 70,000 miles (almost 50k of those in my care).

The bearings were almost down to the copper! Just a heads up for those still using their cars as they were meant..

Niall

[Chad]

Originally Posted by niall1

I recently hit 70k miles in mine and as it's no longer my daily I thought it better to have some preventative maintenance with a bottom end rebuild at this service, as I had read about issues with these engines around this mileage. The car has always been regularly serviced and has only done a handful of track days in it's 70,000 miles (almost 50k of those in my care).

The bearings were almost down to the copper! Just a heads up for those still using their cars as they were meant..

Niall

Pictures of the shells in previous post, are of the second set of shells fitted, they only did 30k maximum. These shells are from the first set including spun shells at about 70k

[Chad]

Originally Posted by Monkey

Hi Chad,

Can you feel that pick up with a sharp pick? or your finger nail? If so it would need some attention. You'd also have to measure it with the plastiguage to see if its excessively worn, and to determine which shells you put in when you put it back together.

Hi Out of interest, on the 59.75 or 60.00 main shells. what is the difference in size? between yellow , green ,white shells, I take it the white shell has more meat, green in the middle, yellow the least meat..main shell,in .00mm ...... Bmw don’t give this colour option on rod shells just the two sizes 49.00 48.75. ... are the 48.75 shells for reground cranks? Or did bmw do two crank sizes, surely they never wear that much ,,, if the 48.75 are for reground cranks then bmw only do one size for rod shells , unlike mains , ..Tech minded only need reply. Unless you really want to,,,

[Chad]

Originally Posted by Chad

Hi Out of interest, on the 59.75 or 60.00 main shells. what is the difference in size? between yellow , green ,white shells, I take it the white shell has more meat, green in the middle, yellow the least meat..main shell,in .00mm ...... Bmw don’t give this colour option on rod shells just the two sizes 49.00 48.75. ... are the 48.75 shells for reground cranks? Or did bmw do two crank sizes, surely they never wear that much ,,, if the 48.75 are for reground cranks then bmw only do one size for rod shells , unlike mains , ..Tech minded only need reply. Unless you really want to,,,

Anybody or I’m I missing something

[Monkey]

Originally Posted by Chad

Anybody or I’m I missing something

Hi Chad,

You are correct there are only 2 sizes of bearing available for the big ends, and yes there is a standard size and an option for ground cranks.

As for the mains there is a wider selection of bearing sizes avaiable.

As I mentioned previously, I would only recommend using plastiguage to see which bearing shells you need.

[Chad]

Originally Posted by Monkey

Hi Chad,

You are correct there are only 2 sizes of bearing available for the big ends, and yes there is a standard size and an option for ground cranks.

As for the mains there is a wider selection of bearing sizes avaiable.

As I mentioned previously, I would only recommend using plastiguage to see which bearing shells you need.

Thanks James for confirming that regarding rod shells, as for main shells, is there any technical information as regards thickness difference of the yellow, green,and white shells on std shells, I’m assuming they are only different in 0.01. Or 0.03 difference so to speak just to take up a bit of wear on crank bearing faces. ........ Sorry to blast you with this. Also regarding ring sizes shows two different ring options for std rings, 0 and 00. I’m presuming 00 are to be used on a higher mile engine , any tech info on this appreciated ? £40 price difference also between the two different part numbers I understand measuring end gap etc. ..... Any specific end gap for csl.. thanks for your input James. ,,, speaking to my local engineer suppliers today, they say they would use the 00 term / measurements, to indicate a higher degree of machined /measured accuracy. Phil

[Chad]

Originally Posted by Monkey

Hi Chad,

You are correct there are only 2 sizes of bearing available for the big ends, and yes there is a standard size and an option for ground cranks.

As for the mains there is a wider selection of bearing sizes avaiable.

As I mentioned previously, I would only recommend using plastiguage to see which bearing shells you need.

When I’ve measured crank bearing face they come out as in photo, so std crank. Very minimal wear on this 100k crank , would have been ideal if bmw give you the option of shells as they do on main shells, especially for no 3 .