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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 Fri, Feb-14-2020, 12:06:11 AM   #1
Denniscastro
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Default bolt stripped in bellhousing, do i need it?

Car: 2002 330i, 5 speed.
was taking the trans off, and the top bolt (there are 2 at the top, its the one to the left, and to the right of the 2 starter bolts) stripped. it was so ungodly tight, i could only turn it the slightest bit, got a few turns and it stopped. impacts, nothing would turn it. so i cut off the head, pulled the trans.

i have tried to turn it with vise grips, and a few easy out sockets etc, but havent really gave it my full effort.

Do i really need this bolt? can i leave it as an extra alignment dowel? should i cut it off flush? there is very little clearance, but now with the trans out, i can rotate the engine down a little, but still not the best angle for drilling the bolt out, and these bolts are large and beefy. i think my success rate of drilling this thing out would be low. the car is not used for any track, just a cheaper extra car, has 98,000 miles.

any advice is appreciated!

also 3 of 4 header to exhaust studs broke, and on the 330, there is only a nut on 1 side, the stud is built into the flange on the back, nothing to grab onto.
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Old Fri, Feb-14-2020, 12:09:47 AM   #2
Press22
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Default Re: bolt stripped in bellhousing, do i need it?

We leave one of the top bolts out on our track cars in case we ever have to change a gearbox or clutch in the pits and have never had any issue.
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Old Fri, Feb-14-2020, 01:41:45 AM   #3
Denniscastro
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Default Re: bolt stripped in bellhousing, do i need it?

thats what i was looking for! i didn't think it would be necessary to have both in at the top, as long as the rest were in and tight
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Old Fri, Feb-14-2020, 01:47:08 AM   #4
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Default Re: bolt stripped in bellhousing, do i need it?

So it's aluminum block and the threads might be oxidized. Brush in some brake fluid or ATF, tapping the bolt shaft straight in with small hammer a few times and leave overnight. Try to turn it back in then out, and repeat until it is loose and out.
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Old Fri, Feb-14-2020, 02:48:57 AM   #5
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Default Re: bolt stripped in bellhousing, do i need it?

As long as you have bolts 3, 5, 9 in this pattern (the big boys that make the triangle) holding it on, you will be ok.



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'05 M3 6MT coupe
'04 S2000

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, resonated S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Discussing bolt stripped in bellhousing, do i need it? 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)