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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 Thu, Apr-20-2017, 04:24:22 PM   #1
T3AMFiSh
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Default Quick VANOS question, what is this bolt?

There is a flat Allen head bolt on the top of the vanos, looks like a pressure bolt? Has an o-ring, I can't find any info on it, realOEM doesn't list it or the o-ring or it's torque spec.

Anyone chime in with some info on it?
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Old Thu, Apr-20-2017, 04:35:53 PM   #2
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Default Re: Quick VANOS question, what is this bolt?

The only pressure bolt on top of the VANOS should be a 14mm hex banjo bolt.

http://www.realoem.com/bmw/enUS/show...94#07119905175

#9 on this diagram... should have a copper crush washer above and below the line. Runs from top of VANOS unit to the accumulator down below.

Torque spec - 13Nm or 9.5 ft-lb

If it's allen head, it doesn't belong. Maybe post a picture?
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Old Thu, Apr-20-2017, 04:49:21 PM   #3
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Default Re: Quick VANOS question, what is this bolt?

Yeah it's not that one, this one sits flush, I'll get a pic up
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Old Thu, Apr-20-2017, 04:52:34 PM   #4
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Default Re: Quick VANOS question, what is this bolt?



The goldish looking one right above the exhaust piston cap?
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Old Thu, Apr-20-2017, 04:53:24 PM   #5
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Default Re: Quick VANOS question, what is this bolt?

Yep that's it
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Old Thu, Apr-20-2017, 05:06:45 PM   #6
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Default Re: Quick VANOS question, what is this bolt?

That's nots a separate part. And does not need to be removed.
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Old Thu, Apr-20-2017, 05:21:48 PM   #7
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Default Re: Quick VANOS question, what is this bolt?

Ok, I removed mine do to needing to clean the vanos thoroughly, it's clearly a constant pressure type, like the one on the side of the engine block. It has an o-ring in there as well. NOw that I removed it, I just needed the know the torque spec to put it back. Guess I might have to contact Raj about it
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Old Thu, Apr-20-2017, 05:27:03 PM   #8
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Default Re: Quick VANOS question, what is this bolt?

Ah gotcha. It's not too common I see a reason to remove it. Except I do recall a member having his leak and need an O-ring.
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Old Fri, Apr-21-2017, 03:26:52 AM   #9
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Default Re: Quick VANOS question, what is this bolt?

Emailed Raj but he didn't know the torque spec either, most of the head uses 10-14Nm for external bolts to aluminum so I went with 13Nm
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Old Sat, Apr-22-2017, 06:27:54 PM   #10
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Default Re: Quick VANOS question, what is this bolt?

That's the inlet pressure regulator to the high pressure vanos pump. This regulates the pressure coming from the engine feed.

And then of course you have the 100bar pressure regulator after the pump.
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Discussing Quick VANOS question, what is this bolt? 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)