Wickerbill install - seeking some info - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

51LE50 · 03-31-2018, 07:59 PM

Evening everyone, I'm installing an OE wicker bill on my Z/28 spoiler and it looks like one of the information sheets might have been missing from the box.
I'm looking for a couple pieces of info;

1. The drill bit size of the rivnut. It measures 13.6mm which is pretty darn close to a 9/16 bit, but I'd like to know for certain.

2. What are the 21 rubber washers to be used for? Vibration damping and anti-marring I presume, but I'm only guessing they are placed between the spoiler and around each hole on the wicker bill and on the washer of the screw to keep from marring the wicker bill. Is that correct?

Thanks everyone!

td195f · 03-31-2018, 10:55 PM

The foam washers are to protect the spoiler and the wickerbill. One on the wickerbill to protect the spoiler and one on the bolt washer to protect the wickerbill. If I remember correctly, there are also 4 harder rubber washers with peel and stick adhesive that go on the rubber trunk bumpers to stiffen.

Drill bit size for rivet nuts is 35/64". Chevy cautions DO NOT USE any drill bit larger than 35/64 as the rivet nut could pull out. Torque spec on the M8 bolts 8 N.m =/- 2 N.m. Start with the center bolt and alternate outward.

MonroeZ28 · 04-01-2018, 10:07 AM

Quote:

Originally Posted by 51LE50

Evening everyone, I'm installing an OE wicker bill on my Z/28 spoiler and it looks like one of the information sheets might have been missing from the box.
I'm looking for a couple pieces of info;

1. The drill bit size of the rivnut. It measures 13.6mm which is pretty darn close to a 9/16 bit, but I'd like to know for certain.

2. What are the 21 rubber washers to be used for? Vibration damping and anti-marring I presume, but I'm only guessing they are placed between the spoiler and around each hole on the wicker bill and on the washer of the screw to keep from marring the wicker bill. Is that correct?

Thanks everyone!

Those riv nuts are very temperamental. Use the suggested drill bit or you will have problems. Ask me how I know

51LE50 · 04-01-2018, 04:49 PM

Thank you everyone!

ronchev · 04-02-2018, 06:34 AM

I had 1 go in that didn't seem to tighten right and was a little looser than I like but after looking trying to find the GM part number for a replacement riv-nut (never found part number) it did torque to spec and is still there.

51LE50 · 04-03-2018, 06:32 PM

I have a Marson tool - but of course it's standard and not metric. Gave up on buying a M8 mandrel for it and ordered a tool through Amazon.
Marson instructions called for a 17/32 drill for their M8 rivnut. I'd guess GM's would be similar.
Signed up for Buttonwillow in 3 weeks with NASA and then doing the Nevada Open Road Challenge in May and wanted to get a feel any changes in handling.
The spoiler was nothing to drill through and seems very easy to 'eff up the rivnut installation. 8 nm torque spec is near 5.5 ft. lbs. / 66 in. lbs.? Not much for sure.
Thank you everyone.

03-31-2018, 07:59 PM	#1
51LE50 Drives: 2015 1LE, 2SS, Bright Yellow Join Date: Mar 2016 Location: Big Ditch, CA. The 805 Posts: 132	Wickerbill install - seeking some info Evening everyone, I'm installing an OE wicker bill on my Z/28 spoiler and it looks like one of the information sheets might have been missing from the box. I'm looking for a couple pieces of info; 1. The drill bit size of the rivnut. It measures 13.6mm which is pretty darn close to a 9/16 bit, but I'd like to know for certain. 2. What are the 21 rubber washers to be used for? Vibration damping and anti-marring I presume, but I'm only guessing they are placed between the spoiler and around each hole on the wicker bill and on the washer of the screw to keep from marring the wicker bill. Is that correct? Thanks everyone!

03-31-2018, 10:55 PM	#2
td195f Drives: 2015 Z/28 #786 Join Date: Mar 2013 Location: Hastings, NY Posts: 475	The foam washers are to protect the spoiler and the wickerbill. One on the wickerbill to protect the spoiler and one on the bolt washer to protect the wickerbill. If I remember correctly, there are also 4 harder rubber washers with peel and stick adhesive that go on the rubber trunk bumpers to stiffen. Drill bit size for rivet nuts is 35/64". Chevy cautions DO NOT USE any drill bit larger than 35/64 as the rivet nut could pull out. Torque spec on the M8 bolts 8 N.m =/- 2 N.m. Start with the center bolt and alternate outward. __________________ 2015 Z/28 #786 - Black 2004 Silverado 3500 Dually - D'Max - Suncoast - Banks - Edge - Custom Tune by D'Max Tuner / Spitzer '32 Bantam Altered Drag Car - Blown Alcohol 380 CI Small Block Chevy Last edited by td195f; 04-02-2018 at 10:09 PM.

04-01-2018, 04:49 PM	#4
51LE50 Drives: 2015 1LE, 2SS, Bright Yellow Join Date: Mar 2016 Location: Big Ditch, CA. The 805 Posts: 132	Thank you everyone!

04-02-2018, 06:34 AM	#5
ronchev Drives: 14' Red Z/28 #336 Join Date: Mar 2016 Location: Northen Indiana Posts: 367	I had 1 go in that didn't seem to tighten right and was a little looser than I like but after looking trying to find the GM part number for a replacement riv-nut (never found part number) it did torque to spec and is still there.

04-03-2018, 06:32 PM	#6
51LE50 Drives: 2015 1LE, 2SS, Bright Yellow Join Date: Mar 2016 Location: Big Ditch, CA. The 805 Posts: 132	I have a Marson tool - but of course it's standard and not metric. Gave up on buying a M8 mandrel for it and ordered a tool through Amazon. Marson instructions called for a 17/32 drill for their M8 rivnut. I'd guess GM's would be similar. Signed up for Buttonwillow in 3 weeks with NASA and then doing the Nevada Open Road Challenge in May and wanted to get a feel any changes in handling. The spoiler was nothing to drill through and seems very easy to 'eff up the rivnut installation. 8 nm torque spec is near 5.5 ft. lbs. / 66 in. lbs.? Not much for sure. Thank you everyone.