Crank Bolt Capture and still spun crank hub?

[matty088]

I can’t find a shop that will do the CBC. They will do a full
Solution or nothing. Can anyone recommend a shop in the north east. Nj ny ct mass ri.

Please

[jpy1980]

Originally Posted by matty088

I can’t find a shop that will do the CBC. They will do a full
Solution or nothing. Can anyone recommend a shop in the north east. Nj ny ct mass ri.

Please

What a bummer! That's an easy 400-500 bucks for them.

Maybe you can try and do it yourself? https://f80.bimmerpost.com/forums/sh....php?t=1594892

[TouringM3]

Originally Posted by Rokoz

DCT? Do some kick downs for science please

Coooolllllllddddddd blooded 😜

[RugbyBro]

Originally Posted by jpy1980

What a bummer! That's an easy 400-500 bucks for them.

Maybe you can try and do it yourself? https://f80.bimmerpost.com/forums/sh....php?t=1594892

@matty088

This - all you're doing is removing the bolts that hold on the harmonic balancer in place and replacing them with the CBC bolts (after placing the CBC over the crank bolt). Part(s) #4 in the diagram linked below:

https://www.realoem.com/bmw/enUS/sho...97#11237575488

Edit: I don't mean to oversimplify, just really saying that it's not a complex procedure like installing a hub. $500 is about right though if you have a shop install it (based on estimates I've received in the Bay) - anything more is what I would consider an "F U" price.

[jpy1980]

Originally Posted by RugbyBro

@matty088

This - all you're doing is removing the bolts that hold on the harmonic balancer in place and replacing them with the CBC bolts (after placing the CBC over the crank bolt). Part(s) #4 in the diagram linked below:

https://www.realoem.com/bmw/enUS/sho...97#11237575488

Edit: I don't mean to oversimplify, just really saying that it's not a complex procedure like installing a hub. $500 is about right though if you have a shop install it (based on estimates I've received in the Bay) - anything more is what I would consider an "F U" price.

yup! It cost me $500 including the CBC along with tax. SoCal price.

[HyeM3]

Originally Posted by matty088

I can’t find a shop that will do the CBC. They will do a full
Solution or nothing. Can anyone recommend a shop in the north east. Nj ny ct mass ri.

Please

Have you tried Kies Motorsports?

[matty088]

Originally Posted by HyeM3

Have you tried Kies Motorsports?

wont do just a CBC

[Mike.]

Originally Posted by matty088

wont do just a CBC

petrol works on LI?

[MisterF80M3]

Originally Posted by matty088

wont do just a CBC

Do you guys not have that many shops that specialize on the S55 platform? I've been hearing multiple people having a hard time finding a shop that will install CBC in the East Coast.

The shop won't install CBC because they don't want to lose out on the money for the full install. Full install will cost 4-5x more for just labor alone.

[Chris@VargasTurboTech]

There has to be a shop that'll help you. It's not a hard install at all.

[matty088]

Originally Posted by MisterF80M3

Do you guys not have that many shops that specialize on the S55 platform? I've been hearing multiple people having a hard time finding a shop that will install CBC in the East Coast.

The shop won't install CBC because they don't want to lose out on the money for the full install. Full install will cost 4-5x more for just labor alone.

no. i called several. no one will do a CBC. just VAC which is too far.

[TopJimmy]

Originally Posted by matty088

no. i called several. no one will do a CBC. just VAC which is too far.

C'maaan. We got cheesesteaks (wiz wit)! What's a little drive to Philly, eh?

[jd__m4]

Originally Posted by TopJimmy

C'maaan. We got cheesesteaks (wiz wit)! What's a little drive to Philly, eh?

VAC will get that jawn done in no time

[RugbyBro]

Originally Posted by matty088

no. i called several. no one will do a CBC. just VAC which is too far.

Why not ask if a shop will replace your accessory belt, or better yet, replace the harmonic balancer. If they say they'll do that, then ask if they will do a CBC? At least then you'll know they won't do it out of principle.

Literally all that is happening is placing the CBC over the crank bolt on top of the balancer and replacing the lockdown bolts. I'm sure even a run of the mill BMW maintenance shop that doesn't do any special performance work can do it (2-3 shop hrs). There is no messing with the hub or timing tools required.

Preemptive Disclaimer: THIS IS NOT AN OPINION ON THE NECESSITY OF A CRANK HUB FIX

[300tour]

Got mine in... I was already having the hub fix, but added the CBC.

[aliiin]

The shop most people recommend here in DFW says "crank bolt captures don't do anything." (quoted verbatim) I mean if you're going to do the crank hub, why not just also do the CBC?

[Chris@VargasTurboTech]

Originally Posted by aliiin

The shop most people recommend here in DFW says "crank bolt captures don't do anything." (quoted verbatim) I mean if you're going to do the crank hub, why not just also do the CBC?

Well that's silly. It's a fastener retention device, a concept used all over the world in thousands of applications to.... stop fasteners from loosening.

I definitely agree, there is a case for CBC only, but there is zero case for crank hub and no CBC.

Chris

[Gertsee]

Originally Posted by matty088

I can’t find a shop that will do the CBC. They will do a full
Solution or nothing. Can anyone recommend a shop in the north east. Nj ny ct mass ri.

Please

Not sure if you have already but try contacting

European Auto
RkTunes
TheStanceShop
ImportAutoWerks

I believe they're all located in Queens

[Hoppyumr]

Originally Posted by Chris@VargasTurboTech

Well that's silly. It's a fastener retention device, a concept used all over the world in thousands of applications to.... stop fasteners from loosening.

I definitely agree, there is a case for CBC only, but there is zero case for crank hub and no CBC.

Chris

I know what you are trying to say, but here's my take on it. I'm going to make something up, so hopefully it makes a slight sense. It's not a perfect analogy but I think the moving parts work well enough; don't beat me up too much if it doesn't make sense to you - just trying to help Parle realize that adding a device bolted stirringly to something that can still move seems relatively pointless to me at least.

Imagine setting a mirror down on a lazy Susan, you know the type that spins on table, and the lazy Susan is sitting on a round table. Because you really don't want the mirror to move you add a big bracket between the table top and the lazy Susan using really heavy duty grade 12 bolts. The reason we did all this was so while sitting at our home office we can still see the football game. That should solve it, right, the mirror is placed just right so we can see the game - nothing will move, and it'll all be perfect. But wait, your girlfriend/wife suddenly decided to rearrange the kitchen including spinning the table around, and because the table moved now you can't see the game anymore without repositioning things the way they were. If the wife/girlfriend was really mad you did all this to see the game she might just break your mirror altogether... 😜

While it's not perfect, hopefully you see the analogy I came up with here.

1. Floor = crankshaft
2. Table = crank hub
3. Lazy Susan = Harmonic balancer
4. Bracket between table and lazy Susan = CBC
5. Bolts= well, the new hub bolts holding the CBC
6. Mirror = timing cog
7. Setting the mirror on the lazy Susan = diamond sintered friction discs (note we didn't change anything here)
8. Moved mirror = engine out of time,
9. Seeing the game = engine perfectly in time
10. Wife/girlfriend = unexplained reason for spun crank hub failures
11. Wife/girlfriend breaking mirror = engine destroyed

The thing we didn't really change here was the thing holding the table in position, aka static friction. The only way to change static friction is to change the coefficient of friction, or change the force acting on the coefficient of friction. In this case, increased coefficient of friction could be by use of pins or potentially (not saying it works or not) splined hub, or could be by overtighting the crank bolt (same as making the above table much heavier such that the wife/girlfriend couldn't move it. The timing cog could even be welded or pinned in place, but if the assembly is allowed to shift at all, then the intent has failed. Nothing in the CBC solution done alone has increased the static friction between the timing cog and the hub.

I'd be interested to know why BMW thought it a good idea to create this "mechanical fuse" in the engine.

[RugbyBro]

DIYed it today using the guide posted above. Pain in the booty but definitely doable, plus I cleaned out 3 years worth of kicked up rocks and leaves from the various radiators. Need low profile tools tho, as space is quite limited.

[landonvan]

Her is my take on the whole thing. In every case I have read when the crank spins. The bolt is loose. Not one shop has said that the bolt was still factory tight but the hub still spun. And from this forum I have only found a few. And I mean a few like on one hand, people that spun their hub with just the CBC. Some have spun with both. But they are in 800hp/Tq. Range. So at that point any week link is subject. I have Vargas GC. Making over 600hp. I don’t drive like an ass but I enjoy my car. I just have the CBC. No plans on doing anything more. And I’m at 67k miles.
And for the guy that can’t find a shop. Come down the Virginia. I’ll do it for you. At my shop.

[Groganrocket]

Had my CBC and midpipe installed for 350.