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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Jan-25-2020, 05:04:51 PM   #1
Kieffer87
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Default Crank Sprocket Index Pin

TL;DR: I sheared off the index pin on my crank sprocket, do I need to replace the crank sprocket?

I pulled off the front lower timing cover to replace the oil pump tensioner and front main seal. I noticed when I was putting the harmonic balancer back on that the index pin which aligns the crank sprocket and harmonic balancer had sheared off. I was going to put it back on anyways because with 4 bolts (#8 in link below), I can simply ensure the balancer is aligned with where the pin would have gone. Then I saw https://imgur.com/a/BHtj3eY and they seem to indicate the index pin is essential for timing.

https://www.realoem.com/bmw/enUS/sho...diagId=11_2997

What am I missing? if the 4 long bolts connect the balancer -> sprocket -> crank how is it possible the little soft metal index pin is essential for timing? I've not removed the timing chains nor the sprocket so timing should still be set right?
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Old Sat, Jan-25-2020, 05:36:32 PM   #2
heinzboehmer
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Default Re: Crank Sprocket Index Pin

I think that pin is there to indicate how the balancer should be installed. The orientation is probably essential, but not the pin itself. Mine was sheared as well and I just reinstalled it using the sheared pin as a visual aid. No problems in 15k miles or so.
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Old Sat, Jan-25-2020, 05:38:58 PM   #3
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Default Re: Crank Sprocket Index Pin

Quote:
Originally Posted by heinzboehmer View Post
I think that pin is there to indicate how the balancer should be installed. The orientation is probably essential, but not the pin itself. Mine was sheared as well and I just reinstalled it using the sheared pin as a visual aid. No problems in 15k miles or so.
Glad to hear, that's the answer I was looking for
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Old Sun, Jan-26-2020, 05:30:00 PM   #4
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Default Re: Crank Sprocket Index Pin

You just need to orient it correctly otherwise the TDC mark on the damper will be at least 90 degrees off when you time the motor.


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Old Mon, Jan-27-2020, 09:11:21 PM   #5
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Default Re: Crank Sprocket Index Pin

On the subject of crank sprocket, the main seal stopped the oil leak around the sprocket outside diameter, but what stops the oil leaking via the 5 mounting bolts? I don't see any o-ring between the sprocket and the crank to seal off this path. Any ideas?
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Discussing Crank Sprocket Index Pin in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)