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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > S55 Crankshaft/Flywheel Locking Pin Location (need help!)

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      01-02-2022, 08:09 AM   #1
Bass_Masterson
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S55 Crankshaft/Flywheel Locking Pin Location (need help!)

I'm in the middle of doing a crank hub job on my M2 Competition (I'll do a write up once this is all done), and my engine does not have the hole to insert the flywheel locking pin to lock the crank at TDC. I have looked everywhere and every source (none from official service info, though) I find says it should be near the bell housing under/behind the J-pipe. I have found photos and videos of the pin in place. My engine just has blank aluminum in that spot. I have spent about 3 hours poking around my engine, to no avail. Is there another way to time the crank? I am using a friend of a friend's shop, so I really need to get this done and out of his way.
My car is a 2020 with M6 transmission. I am very perplexed there is no hole for the pin. Please let me know if you've heard of this before!
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      01-02-2022, 03:03 PM   #2
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I've heard in some cases the transmission must be dropped in order for the flywheel securing tool to be used.
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      01-02-2022, 03:48 PM   #3
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Quote:
Originally Posted by F87source View Post
I've heard in some cases the transmission must be dropped in order for the flywheel securing tool to be used.
I sure hope not. To clarify, it isn't to hold the flywheel to remove/install the crank hub, it is the index pin to hold the crankshaft at top-dead-center for timing.

I purchased the 1 day BMW TIS subscription and found this:
Attached Images
 

Last edited by Bass_Masterson; 01-02-2022 at 04:02 PM..
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      01-02-2022, 03:52 PM   #4
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Quote:
Originally Posted by Bass_Masterson View Post
I sure hope not. To clarify, it isn't to hold the flywheel to remove/install the crank hub, it is the index pin to hold the crankshaft at top-dead-center for timing.

I purchased the 1 day BMW TIS subscription, as I thought it contained service information, as the link on the defunct newtis website implied. I can't find any relevant service procedures there.
Yup it is the fly wheel locking location, I have a slot on my 6mt for me to insert that tool and lock the crankshaft without dropping the transmission, if you do not have such a hole you might have to drop the transmission.


Also ISTA is a really helpful tool, you should look into getting that. If I have some time I will try to screen shot the instructions for you, but no promises because I am a bit preoccupied at the moment.
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      01-02-2022, 03:54 PM   #5
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Here's the image of the locking tool:







This is the thread I got it from, so it might help https://f80.bimmerpost.com/forums/sh....php?t=1561598
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      01-02-2022, 04:08 PM   #6
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Quote:
Originally Posted by F87source View Post
Here's the image of the locking tool:







This is the thread I got it from, so it might help https://f80.bimmerpost.com/forums/sh....php?t=1561598
Thanks, but that's not quite what I'm referring to.
Please see my above edited post. I will have to take a closer look but I don't recall seeing that plastic plug. No one ever mentioned it while describing this service.

Last edited by Bass_Masterson; 01-02-2022 at 04:21 PM..
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      01-02-2022, 04:11 PM   #7
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Quote:
Originally Posted by Bass_Masterson View Post
Thanks, but that's not quite what I'm referring to.
Please see my above edited post. I will have to take a closer look but I don't recall seeing that plastic plug. No one ever mentioned it which describing this service.
Oh I see.

So I am going to assume you are referring to the TDC guide pin:

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      01-03-2022, 03:42 AM   #8
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Problem solved. I will do another thread with a bit more info for searchability's sake.
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      01-03-2022, 09:51 AM   #9
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Quote:
Originally Posted by Bass_Masterson View Post
Problem solved. I will do another thread with a bit more info for searchability's sake.
Glad you solved your problem, and sharing this info will be helpful to others. Did it have to do with cranking the first cylinder to top dead center?
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      01-03-2022, 04:31 PM   #10
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Quote:
Originally Posted by Detoxified View Post
Glad you solved your problem, and sharing this info will be helpful to others. Did it have to do with cranking the first cylinder to top dead center?
Nope, that was simple. Just removed spark plug #1 and inserted a clean, smooth rod into the spark plug hole, then turned engine until the rod moved up then briefly stopped before moving back down. Only issue I had was finding (or rather knowing to feel for) that plastic plug to remove for the index pin.
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      04-12-2022, 05:46 PM   #11
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Quote:
Originally Posted by Bass_Masterson View Post
I sure hope not. To clarify, it isn't to hold the flywheel to remove/install the crank hub, it is the index pin to hold the crankshaft at top-dead-center for timing.

I purchased the 1 day BMW TIS subscription and found this:
this picture saved my life couldn't even find it in BMW TIS, got it done! thank youuuuuu
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      01-22-2023, 11:13 PM   #12
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Quote:
Originally Posted by Bass_Masterson View Post
I sure hope not. To clarify, it isn't to hold the flywheel to remove/install the crank hub, it is the index pin to hold the crankshaft at top-dead-center for timing.

I purchased the 1 day BMW TIS subscription and found this:
Where is this located exactly? I can’t tell where this is. I can see the flywheel teeth from underneath the car, if I follow the casing for the flywheel in the direction of the driver side of the car (left), how far up is this whole and image? 90 degrees up roughly? 50? 100? Just trying to gauge a frame of reference for locating the hole, as I can’t tell what I’m seeing in that picture.
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      08-06-2023, 03:03 PM   #13
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Better late than never...since I could find it at first.

It's just under the starter!!!
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