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Old 06-19-2017, 03:45 PM   #1
quikduk
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Trouble installing plastic belly pan

I was able to get a replacement belly pan from BimmerMerchant (not affiliated and kind of stumbled across them one day when I was in their area (Anaheim, CA) and started "browsing" their shop.

http://www.bimmermerchant.com/

If they aren't now, perhaps a mod could convince them to become a site sponsor/vendor.

Anyway, I got the panel as well as some replacement clips and pins, which are not screws exactly and while all of the other fasteners will install correctly, the front three appear to be too short. Are the front three actually a different type of clip and fastener or are longer fasteners available? I have had no luck with this issue ATM so any help is appreciated.






Last edited by quikduk; 06-19-2017 at 03:50 PM.
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Old 06-19-2017, 03:49 PM   #2
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What happens is that once all of the other fasteners are screwed down into the receiving clips, the front of the shield has a lip that rests on a corresponding lip on the bottom of the front valence. The "screws" are only long enough to barely touch the clip but not go through enough to turn and lock.

One thought was I could change the three spring clips to more conventional ones that take standard pan-head sheet metal screws and then find long enough SM screws.

Thanks in advance for the help.
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Old 06-19-2017, 04:37 PM   #3
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IDK if the coupe pan is different from the sedan, but on mine the pan fits above the edge of the valence and I can't fully tighten things until they are all "started" The screws only go through one layer of plastic, plus the retaining washer and then into the receiving clip.
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Old 06-19-2017, 05:16 PM   #4
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The three screws in the front of the pan should be holes only for the push rivet pin fasteners. Did the plastic pan come with those screws attached? If so then it's different from my 05 coupe.
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Old 06-19-2017, 05:55 PM   #5
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I use 3 of these quick ones up front.
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Old 06-19-2017, 07:56 PM   #6
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05SMG:

No it didn't come with the pins. I ordered them (I Think) from OEM Bimmer Parts.

Fox Fader:

I had thought about using some plastic push pins like the ones you showed. I will take a thickness measurement of the pan and the valence as well as the related hole diameters to see what would work.

The special screw would work if it was like 10mm longer but I think that they are all the same. I have to figure how to get the fasteners off the pan now that the washers are on though...

I'll look at it tonight and see what I can come up with. Thanks everyone for the comments!
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Old 06-19-2017, 08:23 PM   #7
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I use the same as fox fader for the 3 front points. I got them from fcp

https://www.fcpeuro.com/products/bmw...et-51118174185
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Old 06-19-2017, 08:30 PM   #8
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I use the same as fox fader for the 3 front points. I got them from fcp

https://www.fcpeuro.com/products/bmw...et-51118174185
04's must be different, my 03 doesn't have any across the front or holes. Edit, I've got the holes, the push pins were not there when I bought the car.
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Old 06-20-2017, 12:46 AM   #9
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^^yup^^ part number ending with #185
Belly pan fasteners.
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Old 06-20-2017, 08:18 AM   #10
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I don't use the push pins in my car. I figure the 7 screws are enough.
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Old 06-20-2017, 08:37 AM   #11
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I don't use the push pins in my car. I figure the 7 screws are enough.


I figured though that if wind got between the pan and the valence, it could tear the plastic. The screws hold it tight on the sides and the rear but not enough in the front.

I will try the push pins of some variety from either my stock or Napa. If they don't work, I'll order some from the link above.


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Old 06-20-2017, 08:55 AM   #12
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Originally Posted by quikduk View Post
I figured though that if wind got between the pan and the valence, it could tear the plastic. The screws hold it tight on the sides and the rear but not enough in the front.
Depends on the relationship between the front valence and the pan. My pan is tucked up above the rear lip of the valence. No possibility of wind tearing the plastic loose.

If the pan hangs down below the valence, I could see wind being a problem.
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Old 06-20-2017, 09:25 AM   #13
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Originally Posted by quikduk View Post
05SMG:

No it didn't come with the pins. I ordered them (I Think) from OEM Bimmer Parts.

Fox Fader:

I had thought about using some plastic push pins like the ones you showed. I will take a thickness measurement of the pan and the valence as well as the related hole diameters to see what would work.

The special screw would work if it was like 10mm longer but I think that they are all the same. I have to figure how to get the fasteners off the pan now that the washers are on though...

I'll look at it tonight and see what I can come up with. Thanks everyone for the comments!
I had to rub the 3 holes with drill bit on the pan just a half a hair so the unlocked pin would slip through. If that makes sense.
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Old 06-20-2017, 09:43 AM   #14
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I had to rub the 3 holes with drill bit on the pan just a half a hair so the unlocked pin would slip through. If that makes sense.


It does. I checked both the pan and lower valence lip and have more questions.

Apparently the pan has holes around 1/4" dia. but the valence has holes around 3/8"-7/16". Now I have to figure how to either find a pin that will pass through the pan and expand the other side enough to hold in the larger hole or have two fasteners.

Maybe I should just install nut-certs in the valence.


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Old 06-20-2017, 09:52 AM   #15
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It does. I checked both the pan and lower valence lip and have more questions.

Apparently the pan has holes around 1/4" dia. but the valence has holes around 3/8"-7/16". Now I have to figure how to either find a pin that will pass through the pan and expand the other side enough to hold in the larger hole or have two fasteners.

Maybe I should just install nut-certs in the valence.


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The other issue is that the pan has a rolled lip that is about 3/4" tall so the pins/bolts would have to be between 1" to 1-1/4" long.

I am wondering if the late 2005/early 2006 (this car has a BOD of 11/14/2005) with the newer style valence uses a different front plastic belly pan as why would BMW design the valence lip to have a 3/4" "air gap" btwn the valence and the plastic pan?

Maybe I need to find a clip in spacer that spans the gap. I'll need to engineer something I guess. I'll post a sketch later this AM of the condition.


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Old 06-20-2017, 11:21 AM   #16
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Quote:
My pan is tucked up above the rear lip of the valence. No possibility of wind tearing the plastic
loose.
Mine is too, that's why with no pushpins it doesn't come off. OP, put the pan above the rear of the valence then the pins will go through the larger hole and expand in the smaller hole of the pan, it's not rocket science.
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Old 06-20-2017, 11:33 AM   #17
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Mine came to me with no pins. God only knows how long they've been missing.
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Old 06-20-2017, 12:12 PM   #18
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Originally Posted by jmo69 View Post
loose.
Mine is too, that's why with no pushpins it doesn't come off. OP, put the pan above the rear of the valence then the pins will go through the larger hole and expand in the smaller hole of the pan, it's not rocket science.


I tried that but couldn't get it to align correctly. Perhaps I had too much tension from other fasteners tightened.

I'll pick up pins today and try tonight. Thanks again.


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Old 06-20-2017, 01:55 PM   #19
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So I have looked at all my current pics and have cropped some to show the condition a little better. I should have had some of the valence but my crude sketch below will hopefully show the issue. I looked at Napa and think I have a fix. I just need to temp. mount the pan on the car tonight and take measurements so I can buy the closest fitting parts.







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Old 06-20-2017, 01:58 PM   #20
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Hopefully my last post was clear enough to describe that I cant hang the pan above the valence lip due to there being multiple triangular reinforcement ribs along the leading edge of the pan. I think my solution will work and I may add spacers so the leading edge of the pan at the holes doesn't flex and crack.

This part was $40 used, which is a far cry from OEM costs, but is in great shape.

I'll take better pics when I get this done this week(end).
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