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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 Tue, Jul-24-2018, 09:52:50 PM   #1
eacmen
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Default Potential Fix for Stripped VANOS<->Head Bolt

I had a n00b moment last night when I torque'd the VANOS to Head bolt to 14Nm instead of 10Nm. Result was a coil of aluminum threads coming out of the head. The bolt I stripped is #11 in this diagram:

https://www.realoem.com/bmw/enUS/sho...diagId=11_2994

After ordering some TimeSerts and preparing myself to remove the VANOS yet again I did a search on other slightly longer BMW bolts that have the same class (8.8) and same thread pitch (M6x1.0).

I came across this gem:

https://www.realoem.com/bmw/enUS/par...7-11-9-904-525

This bolt is the same type (even has the built-in washer) as the VANOS head bolts but is 5mm longer (original bolt is 35mm this one is 40mm). I screwed it in and torque'd it to spec and it seems to hold so far. I haven't put everything back together yet though.

Curious of any opinions on this method. Other forum members have had success with the TimeSerts. I figured this might be a cheap $2 trip to the dealer to fix the same issue without tearing off the VANOS.
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Old Wed, Jul-25-2018, 06:33:12 AM   #2
mrgizmo04
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Default Re: Potential Fix for Stripped VANOS<->Head Bolt

So you are relying on the extra threads in the head that the 35mm didn't reach?

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__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Wed, Jul-25-2018, 06:35:07 AM   #3
eacmen
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Default Re: Potential Fix for Stripped VANOS<->Head Bolt

Quote:
Originally Posted by mrgizmo04 View Post
So you are relying on the extra threads in the head that the 35mm didn't reach?

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Correct.
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Old Wed, Jul-25-2018, 06:36:25 AM   #4
mrgizmo04
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Default Re: Potential Fix for Stripped VANOS<->Head Bolt

Quote:
Originally Posted by eacmen View Post
Correct.
I don't see a problem with that. Sounds clever.

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__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Discussing Potential Fix for Stripped VANOS<->Head 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)