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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Dropped Bolt In Timing Chain Area



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      04-03-2016, 01:24 AM   #1
killerace
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Dropped Bolt In Timing Chain Area

I was doing a VCG and eccentric shaft sensor replacement, I assumed the old sensor had captive screws like the new one.. long story short I dropped the bottom bolt (10mm) right into that area...

going to try to fish it out with a magnet tom, otherwise have to remove the oil pan? Is there any where else it can go to or will it end up in the oil pan?
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      04-03-2016, 02:01 AM   #2
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It should be in the oil pan. With some luck and good magnet tool and you should get it out. Trust me even couple hours trying to get it is better then dropping oil pan.

good luck
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      04-03-2016, 05:23 PM   #3
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Been at all day and cant find it. Drained the oil and not in there as well. What should i do next?

Should i continue and finish thr vcg install and assume its in the oil pan or get it towed like this?
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      04-03-2016, 05:27 PM   #4
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Thats some bad luck, if you heard it fall you can gauge how far down it is. Hopefully its not stuck in the front cover. But I wouldn't risk leaving it down there. If you have a bendable/Flexible magnet maybe you can fish for it from the oil drain hole.
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      04-03-2016, 05:47 PM   #5
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Is there anything else i can do or is oil pan the only way?
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      04-03-2016, 06:23 PM   #6
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Check this out. http://m.harborfreight.com/digital-i...era-62359.html

It has saved me many times on my audi 4.2 twin turbo.
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      04-03-2016, 06:34 PM   #7
John 070
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Quote:
Originally Posted by engineer73 View Post
Check this out. http://m.harborfreight.com/digital-i...era-62359.html

It has saved me many times on my audi 4.2 twin turbo.
I wonder if that can be used for DIY knee surgery?
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      04-03-2016, 06:39 PM   #8
killerace
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I will get one of those tomorrow, if its in the oil pan should i leave it in there? could it get sucked up or will it be heavy enough to stay there?
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      04-03-2016, 09:08 PM   #9
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your oil pickup has a screen on it so it won't get sucked up in the near term though if you leave it in there it could puncture the screen and grenade things.
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      04-04-2016, 05:52 AM   #10
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Quote:
Originally Posted by John 070 View Post
I wonder if that can be used for DIY knee surgery?
It depends if you have that much trust in your friends. In my case NO!!!
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      04-04-2016, 08:47 AM   #11
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You could remove the Vanos units, you'd have more room to look for it, without removing the oil pan. Best case it fell all the way, worse case its stuck on the timing chain. Either way, things are going to get expensive quickly
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      04-04-2016, 01:31 PM   #12
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Removed the vanos and checked but cant see it anywhere around the timing chain. Im assuming its in the oil pan? Nothing else to do except drop the oil pan right?
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      04-04-2016, 02:24 PM   #13
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You could use a bendi magnet pen and might get lucky from the oil level sensor hole in the oil pan
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      04-04-2016, 02:47 PM   #14
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Id buy the camera and buy a flex magnet. Oil pan is no fun sorry
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      04-04-2016, 03:12 PM   #15
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Inspection camera.
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      04-04-2016, 03:27 PM   #16
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Insert one of those retractable magnets from the top into the pan area.

Now from underneath, using a larger magnet start dragging along the surface of the oil pan and lead towards the retractable magnet position.

When you feel them connect to the screw pull away the big magnet from the pan and pull out the screw from the top.

Will take some time but it could work.
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      04-04-2016, 04:05 PM   #17
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Quote:
Originally Posted by engineer73 View Post
Check this out. http://m.harborfreight.com/digital-i...era-62359.html

It has saved me many times on my audi 4.2 twin turbo.
I had one of those and it stopped working after I used it three times. So I went out and bought one of the many $15-25 USB borescope inspection cameras available at online retailers like Amazon. They're very small, work great, and can be used with a laptop or a phone (if you have a OTG cable). The one I purchased is below. It comes with several attachments including a magnet as well as software. You'd need to connect it to a metal coat hangar or stiff wire.

http://www.amazon.com/Crenova-Megapi...rch_detailpage
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      04-04-2016, 06:01 PM   #18
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Quote:
Originally Posted by John 070 View Post
I wonder if that can be used for DIY knee surgery?
This is the first time a see anyone refer to colonoscopy as "knee surgery".
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      04-04-2016, 08:01 PM   #19
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This is unfortunate. I think for piece of mind you should drop the pan, it's really not as bad as people are making it out to be. You can leave it hanging by suspension.


- remove all plastic crap from underneath, cowl, indoor air filter, and engine cover
- Make sure to support engine from above (harbor freight, as much as I hate to say it, engine support bar works great for ~$80)
- Loosen upper / lower control arm bolts to subframe to allow for more motion
- disconnect connector for headlight level sensor (driver side lower control arm, not sure if this is necessary)
- disconnect sway bar end links (not sure if this is necessary)
- remove two bolts holding steering rack on subframe and push rack off subframe (not sure if this is necessary either)
- remove three torx head screws holding coolant hose to top of front of subframe. You'll have to remove airbox to get to third one, which sits almost directly under it
- disconnect motor mounts, either from subframe or above from motor
- remove 6 18 mm hex head (if I remember correctly) screws, not bolts, to drop subframe
- remove oil pan fasteners, my car is 6 MT and had 31 torx screws if I remember correctly.

I dropped subframe completely and removed it from my car, so to leave it hanging I'm not quite sure if some of these are necessary.

Most, if not all, of these fasteners are one time use only, so make sure to buy all new ones before you start as well as new oil pan gasket.

Torque specs are all in bentley, but let me know if you need them.

Simon

edit: I forgot, you'll need to remove 6 hex head screws for the V brace as well, the one with the jack pad.

Last edited by simon; 04-04-2016 at 08:45 PM..
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      04-04-2016, 08:21 PM   #20
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If you touch the lower control arm bolts, you'll need an alignment afterwards.
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      04-04-2016, 08:43 PM   #21
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Quote:
Originally Posted by mxchris727 View Post
If you touch the lower control arm bolts, you'll need an alignment afterwards.
Please refrain from posting false information.
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      04-04-2016, 09:02 PM   #22
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Quote:
Originally Posted by mxchris727 View Post
If you touch the lower control arm bolts, you'll need an alignment afterwards.
lol such a hoon.

bruh i would not risk driving it. run some oil through it maybe it will push down. try hitting the oil pan with a rubber mallet see if you can possibly here it jumping around. pretty solid piece though
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