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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 11-01-2013, 05:18 PM
epouss2 epouss2 is offline
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Left over screw from water pump change

I have a screw and I don't know where it goes. I replaced my water pump and t stat and now all is good, except I have one left over screw (not bolt). It is a hex head (11mm head) (6mm thread) screw that looks about a half inch long on the threads. I did not loosen my sway bar. Instead, I removed my radiator fan. But I put everything back together and now I have this one screw left. I figured it probably goes on the skid plate but I'm not sure. It does not have a matching screw anywhere else like this one. My car runs fine but I still have this screw.

It is M6 x 15mm or maybe M6 x 16mm self tapping screw
BTW my car is an automatic. I also had a D6 x 20 (T25) screw but I used it to mount the ATF cooler to the radiator fan. Maybe that was a mistake and that D6 x 20 screw goes somewhere else. The D6 x 20 screw is identical to the screw used to mount the radiator fan.

I have an 06 325i automatic (e90)



Last edited by epouss2; 11-01-2013 at 05:20 PM.
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  #2  
Old 11-01-2013, 08:09 PM
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pointandgo pointandgo is offline
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Hope somebody can assist you.

This reminds me of my (former) engineer who tore down his Honda engine one weekend and had SIX parts leftover when he put it back together. He accused Honda of using "redundant parts" and the car ran just fine after that.
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  #3  
Old 11-02-2013, 08:04 PM
sptt144 sptt144 is offline
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Well, it looks like a panel screw or something as anything critical should not have a drill tap head on it so it probably held something plastic in place like a housing or frame. Just keep it in case you figure it out. Usually those bolts go into a plastic thread or part of the car frame. Maybe helped hold the radiator in place?

Also, did you replace an electronic pump?
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Old 11-02-2013, 09:18 PM
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bear-avhistory bear-avhistory is offline
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If that's green corrosion look for a matching patch with a empty hole in it. Might not be a plastic joiner usually that underside head pattern goes into metal.
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Last edited by bear-avhistory; 11-02-2013 at 09:20 PM.
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  #5  
Old 11-02-2013, 09:53 PM
epouss2 epouss2 is offline
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There's no green corrosion. That's probably from the flash of the camera. I replaced the water pump which is electronic so yes. But all of the bolts were installed on the pump and t stat. I really think it goes to the skid plate or a hose mount or something of that nature.
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Old 11-03-2013, 07:02 AM
fdriller9 fdriller9 is offline
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That doesn't look like any of the bolts you need to remove to change the water pump.

Might just be a random one that got kicked up above your splash shield and it came down with the shield when you removed it.
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Old 11-03-2013, 07:04 AM
fdriller9 fdriller9 is offline
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And 11mm head? I have yet to come across an 11mm bolt on a BMW. Definitely from something else.
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Old 11-03-2013, 07:15 AM
epouss2 epouss2 is offline
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Quote:
Originally Posted by fdriller9 View Post
And 11mm head? I have yet to come across an 11mm bolt on a BMW. Definitely from something else.
Well, I did also loosen my intake manifold to change a cylinder head bolt. But I know I replaced all of those bolts and screws. Maybe my wife thought this would be a funny joke or something. I'm kind of giving up.
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Old 11-03-2013, 07:19 AM
fdriller9 fdriller9 is offline
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I wouldn't stress it. Any bolt on your engine is a machine thread anyway. This is a corse thread and it most likely for a splash shield or some other trim peice.
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Old 11-03-2013, 07:49 PM
sptt144 sptt144 is offline
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Quote:
Originally Posted by epouss2 View Post
There's no green corrosion. That's probably from the flash of the camera. I replaced the water pump which is electronic so yes. But all of the bolts were installed on the pump and t stat. I really think it goes to the skid plate or a hose mount or something of that nature.
How tough was tstat and waterpump change? Did you go aftermarket or dealer parts? Congrats on doing your own!
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  #11  
Old 11-03-2013, 09:19 PM
epouss2 epouss2 is offline
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aftermarket. Ebay for 350 for pump, t-stat, and bolt kit. Took a little while but it's do-able.
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Old 11-03-2013, 09:49 PM
sptt144 sptt144 is offline
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Re: Left over screw from water pump change

Sweet!!! Can you pm me Ebay link for those items? Also, did you get new orig BMW coolant or other. Nice job! Im just collecting nuts for the inevitable and greatly appreciate your experience!

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  #13  
Old 11-04-2013, 05:05 AM
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DSXMachina DSXMachina is offline
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I'd agree it must be a 10mm head screw used to secure a metal part to plastic. That type of screw NEVER secures to metal unless passing into a Tinnerman Clip which is attached to plastic. It has nothing to do with the exhaust manifold, it probably secured a radiator shroud, or secured a small sensor or relay to a plastic component. Lots of good info up above, just seconding the points made.
http://www.google.com/imgres?imgurl=...ed=0CDAQ9QEwAg
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