Quantifiable Spun Crank Hub Data? Choose your year and tune status.

[moonshine89]

Don't forget to add 2018!

[moonshine89]

Originally Posted by MEXICO NEW YORK

Bump, i wonder if this is starting to take shape with a ~6% failure rate? I know we all have follow up questions to this data, but i personally wish we could at least exclude the over-revs/money shots from the data

Money shots...didn't know those were causing spun cranks!!!

[MEXICO NEW YORK]

Originally Posted by moonshine89

Money shots...didn't know those were causing spun cranks!!!

referencing this thread
http://f80.bimmerpost.com/forums/sho...ght=money+shot

[moonshine89]

Originally Posted by MEXICO NEW YORK

referencing this thread
http://f80.bimmerpost.com/forums/showthread.php?t=1170866&highlight=money+shot

Right...just thought it was a money SHIFT...not shot...I think if something different when I hear money shot.

[kyleb350]

Originally Posted by MEXICO NEW YORK

Bump, i wonder if this is starting to take shape with a ~6% failure rate? I know we all have follow up questions to this data, but i personally wish we could at least exclude the over-revs/money shots from the data

6% of the people viewing this thread mind you. There are likely more unaffected and don't bother to read up on this.

[moonshine89]

Is this truly bad luck? Lots of tuned f8x and very little reports of sch

[UGADawgFan]

Originally Posted by m3rxn

Thanks for this thread man. I got a 15 M4 with 12,800K miles on clock,, and tuned my car back in June 2018--kind of worried and wonder if worthwhile to go back to stock. Don't track, drive mostly conservative on the street with occasional spirited driving and pulls.

This is exactly me as well...just with an early build 2016

[CloudVIII]

Do I get to vote twice if it happened twice?

[FriedPiston]

I know you need the Admins involved to change anything in the poll, but it really could use additional breakdown options like below:

2015 Stock  Fail | No-fail
2015 Tuned  Fail | No-fail
2016 Stock  Fail | No-fail
2016 Tuned  Fail | No-fail
2016 ZCP Stock  Fail | No-fail
2016 ZCP Tuned  Fail | No-fail
2017 Stock  Fail | No-fail
2017 Tuned  Fail | No-fail
2017 ZCP Stock  Fail | No-fail
2017 ZCP Tuned  Fail | No-fail
2018 Stock  Fail | No-fail
2018 Tuned  Fail | No-fail
2018 ZCP Stock  Fail | No-fail
2018 ZCP Tuned  Fail | No-fail

There's been a confirmed change in part numbers starting with 2017 Competition Pack models, which many are saying is due to a new bedplate design. As of now, there's no way to distinguish whether those affected 2017 models are ZCP or non-ZCP.

[Alan l.]

Another member in Europe had his crank bolt slip and his independent shop verified that the crank bolt from his 2015/16 M3 was physically different from the new one they ordered from Bmw even though the part number is the same. The new part had a rough texture on the back side like sandpaper which would prevent it from slipping compare to the old one with a completely smooth surface. Now only if we could confirm if and when Bmw actually changed over to this new design...

[FriedPiston]

Originally Posted by Alan l.

Another member in Europe had his crank bolt slip and his independent shop verified that the crank bolt from his 2015/16 M3 was physically different from the new one they ordered from Bmw even though the part number is the same. The new part had a rough texture on the back side like sandpaper which would prevent it from slipping compare to the old one with a completely smooth surface. Now only if we could confirm if and when Bmw actually changed over to this new design...

See information posted by 5soko: https://f80.bimmerpost.com/forums/sh...&postcount=524

[Alan l.]

If that’s indeed when they changed over the fix didn’t work because we have 17 and 18 cars with it still happening.

[FriedPiston]

Originally Posted by Alan l.

If that’s indeed when they changed over the fix didn’t work because we have 17 and 18 cars with it still happening.

Refer to this post for ZCP models: https://f80.bimmerpost.com/forums/sh...&postcount=251

Here's the SCH Master thread in general: https://f80.bimmerpost.com/forums/sh....php?t=1226184

Although, CloudVIII seems to have incurred a SCH even with the supposedly newer bedplate design also.

[Alan l.]

^^ Thanks.

Looks like I have a lot of reading to do tonight...

Alan

[MEXICO NEW YORK]

Originally Posted by moonshine89

Right...just thought it was a money SHIFT...not shot...I think if something different when I hear money shot.

Whoops lol

[moonshine89]

Originally Posted by MEXICO NEW YORK

Whoops lol

Hahaha all good bro. We should def call in money shot now though. Had a good laugh when I saw that!

[CloudVIII]

Originally Posted by nars3000

Refer to this post for ZCP models: https://f80.bimmerpost.com/forums/sh...;postcount=251

Here's the SCH Master thread in general: https://f80.bimmerpost.com/forums/sh....php?t=1226184

Although, CloudVIII seems to have incurred a SCH even with the supposedly newer bedplate design also.

This is correct... first crank hub spin took out the engine and that engine was replaced with new bedplate design. I cross referenced long block part numbers to confirm. Then next time it spun about 30-40 degrees out of time on a dyno pull. I am running VTT crank bolt capture as the solutions out now were not available then when I was getting timing adjusted. Now the slower spooling Pure turbos seem to be easier on the bottom end of the engine even while producing more power. IMHO.

[EB89]

Missing 2014 and 2018 aren't we?

[R1-Racer]

Originally Posted by CloudVIII

This is correct... first crank hub spin took out the engine and that engine was replaced with new bedplate design. I cross referenced long block part numbers to confirm. Then next time it spun about 30-40 degrees out of time on a dyno pull. I am running VTT crank bolt capture as the solutions out now were not available then when I was getting timing adjusted. Now the slower spooling Pure turbos seem to be easier on the bottom end of the engine even while producing more power. IMHO.

I've really been wondering if the Vargas Turbo solution is a good potential fix.

Does anyone have experience with a failure AFTER using one of these?

[4everkidd]

Can someone please post up the new part numbers for the crank hub bolt and friction washer? (where is the friction washer?)

EDIT:
Genuine BMW Vibration Damper Bolt - Part Number 11-21-7-614-270

Also what are the "definite" bolt torque specs? Is it truly 200Nm and 2 x 260 degrees?

I have to remove my front bumper this weekend and have a 6000km road trip planned in July; I plan on replacing the bolt and hitting it with some Loctite

[cryptz]

doesn't the 2017 have the new bedplate and bolt or was it later? just noticing 2017 has the most stock tune failures atm, 3 seems like 3 too many if that is indeed the new design..

[satinghostrider]

Just curious,

If this was my production date reading 2017-08-28, is this considered 2017 ZCP or 2018 ZCP?
I think we also need to know how people are voting based on the manufacturing date as I understand after a certain date in a particular year is considered as the following year.

I feel it will be more accurate if those in 2017 manufacturing date especially are able to mark against the minor design changes for the new part numbers pre and post 2/17 in particular.

Quoting from 5soko's post for ease :

Some changes bmw has made over the years that are the same on the S55 and N55.

Crank hub timing sprocket washer aka friction washer, there has been two P/N for this friction washer for years.

11237848476 which is only used from the start of the S55 unti 2/17
11238090136 which is also used from the start of the S55 but is solely used after 2/17 engines.

What also changed on 2/17?

The oil pump sprocket next to the timing sprocket.
This oil pump sprocket has a built in friction washer.

11417589309 Old sprocket as of 2/17
11418091535 New sprocket starting 2/17

And just to add:

S55 timing chain:

11317584084 used until 1/15
11318648732 new timing chain P/n since 1/15

Oil pump:

11417846388 pump ended 3/16
11418011851 new pump since 3/16
Someone please clarify.

I am only clarifying cause 3 failures seem a lot and it would be good to know if it is pre or post changes BMW did to the sprocket in particular.

Thanks!