Spun crankhub this weekend

[jaysant1]

So this past weekend I spun the crank Hub in my M4. The mechanic hasn't gotten into it yet so I don't know how damage the engine is or isn't. My question is in people's past experience How likely is it that the engine is beyond repair in such a situation? I'm hoping for the best but just wanted to see if anyone else had the issue. Unfortunately the car is not under warranty any longer.

[joooiiiiii]

Sorry to hear that man, heard the spun crankhub damage may not be that bad as it seems. Keep us updated on the engine damage, repair and cost. Fingers crossed for you that it won't be too expensive.

[The Murder 335i]

Sorry this happened. Did you have any mods and what is current mileage and year?

if no mods and close enough to warranty date and milage you could fight for some kind of help from BMW with this known issues.

[michaelalex17]

What were you doing when this happened and DCT or manual?

[Mag1c Carp3t]

If your gonna be out of pocket might as well put in an upgraded one.

[drgmt]

Originally Posted by Mag1c Carp3t

If your gonna be out of pocket might as well put in an upgraded one.

Assuming the upgraded solution works.

[chmura]

Please give us some details.

Manual or dct? Mileage? What mods? How did this happen? What year is your car?

[jaysant1]

The car was running stage 2 catless and is DCT. It happened on the track which is pretty much all i use the car for recently. I was shifting manually but I am never too aggressive with the shift points due to my knowledge of the crank hub issue. Just an unfortunate twist of fate i guess. The car only has 16000 miles on it and is a 2016. Coming out into a turn I braked, down shifted and then the car went into limp mode. I was able to drive it off track although the car wasn't making power. I pulled off into the paddock and the car shut off. Then it wouldn't start again. It did crank but woulnd't turn over. Left is for 24 hours tried again turned over for a second sounded like it was trying to adjust timing and off again with some mechanical noises.

[ctgeorge]

Originally Posted by jaysant1

The car was running stage 2 catless and is DCT. It happened on the track which is pretty much all i use the car for recently. I was shifting manually but I am never too aggressive with the shift points due to my knowledge of the crank hub issue. Just an unfortunate twist of fate i guess. The car only has 16000 miles on it and is a 2016. Coming out into a turn I braked, down shifted and then the car went into limp mode. I was able to drive it off track although the car wasn't making power. I pulled off into the paddock and the car shut off. Then it wouldn't start again. It did crank but woulnd't turn over. Left is for 24 hours tried again turned over for a second sounded like it was trying to adjust timing and off again with some mechanical noises.

Hey, Jason, it's George from this weekend. Really sorry this happened. Like I mentioned to you earlier you might be lucky and only require a retiming and a few valves replaced, unlike myself who required a new engine. Your engine at least cranks over, mine didn't post-spin.

Met another guy over the weekend with an M2 Comp (Manual) with the same issue. In his case, it only required retiming, but ridiculous none the less that BMW released this engine with such a terrible design flaw.

Here the thread when mine occurred:

Similar mileage (18k), same year and DCT
https://f80.bimmerpost.com/forums/sh....php?t=1506870

[jaysant1]

Thanks George. Hopefully I'll see you on the next trip with the car. Fingers crossed.

[Boostin FD]

Does bmw cover this under warranty? Sorry, I’m new to this issue as I was living under the rock for the past 3 years.

[NYG]

Originally Posted by Boostin FD

Does bmw cover this under warranty? Sorry, I’m new to this issue as I was living under the rock for the past 3 years.

Yeah unless you're running a tune, which is who this seems to happen to the most.

[jpy1980]

Originally Posted by ctgeorge

Hey, Jason, it's George from this weekend. Really sorry this happened. Like I mentioned to you earlier you might be lucky and only require a retiming and a few valves replaced, unlike myself who required a new engine. Your engine at least cranks over, mine didn't post-spin.

Met another guy over the weekend with an M2 Comp (Manual) with the same issue. In his case, it only required retiming, but ridiculous none the less that BMW released this engine with such a terrible design flaw.

Here the thread when mine occurred:

Similar mileage (18k), same year and DCT
https://f80.bimmerpost.com/forums/sh....php?t=1506870

What measures are you taking after you spun it once?

Are you driving it different or did you do a crank hub solution?

[jaysant1]

If the engine is salvageable I will be installing the maximum psi fix. Everything else seems to be ok with the tune never had any issue before and I track the car heavily.

[Bmwlmr99]

just turned 65k...no crank hub mods... stage 2 , full exhaust, csf intercooler....very careful with downshifting ....dct trans

[FreeDarko]

Originally Posted by Bmwlmr99

just turned 65k...no crank hub mods... stage 2 , full exhaust, csf intercooler....very careful with downshifting ....dct trans

What does this mean practically speaking - "very careful with downshifting"?

[FreeDarko]

Originally Posted by jaysant1

The car was running stage 2 catless and is DCT. It happened on the track which is pretty much all i use the car for recently. I was shifting manually but I am never too aggressive with the shift points due to my knowledge of the crank hub issue. Just an unfortunate twist of fate i guess. The car only has 16000 miles on it and is a 2016. Coming out into a turn I braked, down shifted and then the car went into limp mode. I was able to drive it off track although the car wasn't making power. I pulled off into the paddock and the car shut off. Then it wouldn't start again. It did crank but woulnd't turn over. Left is for 24 hours tried again turned over for a second sounded like it was trying to adjust timing and off again with some mechanical noises.

OP sorry to hear this. Were you on level 2 shift speed on the DCT?

[mrkmtchll]

Going to the Nürburgring next week and now your scaring me 😳 lol what setting is you DCT in and at what rpms do you normally downshift in?

[Bmwlmr99]

Originally Posted by FreeDarko

What does this mean practically speaking - "very careful with downshifting"?

very observant of my rpms and where the tach is .... one gear swap down at a time no multiple blips .... the torque curve is wide on these cars ( comes in low in the powerband ) .... knowing the potential for a hub failure increases your reliance on breaking more so than aggressively downshifting

[Bmwlmr99]

The weird part about this subject is, I've attended several road racing events and i asked the bmw m4 teams were they using any type of crank hub mod for endurance/ reliability...and they said no....these cars are limited to suspension mods, open exhaust ( no cats ) and piggy back modules based on the circuit... essentially a stage one tune in my opinion.... they run hard for hrs... and compete against audi , amg and mustangs.... no hub issues ever!!!! [IMG]undefined[/IMG]

[jacobe92]

My M3 is heavily modded short of the motor. I've blown a motor before, so I like to keep it intact and OEM. I down shift and mis-shift (DCT) at the track all day long and without a care in the world. Because my motor is unmolested, my computer will always protect it. Peace of mind. Sorry to hear about your engine.

[ctgeorge]

Originally Posted by jpy1980

What measures are you taking after you spun it once?

Are you driving it different or did you do a crank hub solution?

Had the VVT Crank Bolt Capture installed, no longer using the VF Engineering tune as it produces too much torque all at once. Running the Alpine Stage 2 and 2+ tunes which are much more linear in power delivery. Also using no higher than the second transmission shift setting.

My small dealer has seen least a dozen failures with the S55, the majority being tuned, but stock non-tuned have been failing as well.