Mickwhitt 4,593 #1 Posted March 6, 2021 Ok I called it a hood, not a bonnet. So, mine rattles like a tin outhouse in a thunderstorm. The top surface flexes and bounces up and down at tick over. I'd like to brace it to stop the vibration, I have some deadening material that sticks on to the underside but do I need to make some kind of brace to stiffen the panel before I glue this stuff on. Its a problem as I can't stand my gin glass on the bonnet 🙄 Mick 4 Share this post Link to post Share on other sites
ebinmaine 67,328 #2 Posted March 6, 2021 We have a couple Horses with a line of stick on foam tape where the bonnet rides in the bonnet connection point. Not sure if yer black hood body can do that. Share this post Link to post Share on other sites
953 nut 55,120 #3 Posted March 6, 2021 7 minutes ago, Mickwhitt said: Its a problem as I can't stand my gin glass on the bonnet Get a cup holder and some earmuffs! Could be the pivot point holes are enlarged, if so drill them out for a brass bushing to tighten it up. 3 Share this post Link to post Share on other sites
peter lena 8,589 #4 Posted March 6, 2021 MICK, can relate to the hood buzzing , you have to look at each mounting area , and related twisting / chafing , added car door trim strip on back side of hood to dash area , really firmed things up , also added these " fender washers " to all bolt areas, really enhanced the bolt holding point , also used nylock nuts to hold the setting , obviously lubricate all movement points , pete ,https://www.google.com/search?q=fender+washers&sxsrf=ALeKk03VMu6sxoVaAcdr-r5HKTAl90l42Q:1615036923132&tbm=isch&source=iu&ictx=1&fir=1Oi_pjbUMfdtbM%2Cy7-ItE_hAxsO8M%2C_&vet=1&usg=AI4_-kTvOU2HD6gGZwq8UqYw12R5Ti3LGQ&sa=X&ved=2ahUKEwjpnOiw4ZvvAhUOF1kFHa9sCZwQ_h0wAXoECCUQBQ&biw=1024&bih=625#imgrc=1Oi_pjbUMfdtbM Share this post Link to post Share on other sites
squonk 41,040 #5 Posted March 6, 2021 As I read this I'm in the McMaster-Carr book ordering more anti rattle trim for hoods. 2 Share this post Link to post Share on other sites
pfrederi 17,685 #6 Posted March 6, 2021 37 minutes ago, squonk said: As I read this I'm in the McMaster-Carr book ordering more anti rattle trim for hoods. What do you use??? Share this post Link to post Share on other sites
squonk 41,040 #7 Posted March 6, 2021 24175k44 self gripping vinyl edge trim 2 2 Share this post Link to post Share on other sites
squonk 41,040 #8 Posted March 6, 2021 I have my C-160 hood nice and tight on the latch. Starting to rattle at the pivot I believe. Warm weather project Share this post Link to post Share on other sites
Mickwhitt 4,593 #9 Posted March 6, 2021 It is just flexing of the large expanse of flat steel panel. All pivots have been refused, vinyl door seal on the edge where it sits on the dash tower and strong clamps to hold it shut instead of those rubber stretch catches. The deadening material is specialist stuff for vehicle converters to deaden panel boom etc. I'll give it a try and report back. Mick 2 Share this post Link to post Share on other sites
CCW 1,292 #10 Posted March 6, 2021 @Mickwhitt I had this problem as well and have a thread on here somewhere addressing it. Was told the pivot holes were wallowed out. I welded them closed and drilled new holes. Put in new bolts with fiber lock nuts. Rattle has gone away. Share this post Link to post Share on other sites
CCW 1,292 #11 Posted March 6, 2021 (edited) Here's the thread for my rattling bonnet (yeah I said bonnet). ccwpost Edited March 6, 2021 by CCW Share this post Link to post Share on other sites
Mickwhitt 4,593 #12 Posted March 6, 2021 Two minute job to cut and stick three sheets of this stuff into the inside of the bonnet. Its only 2mm thick and is a kind of bitumen adhesive with a foil top layer. It worked a treat and took out a lot of the panel bounce that was bugging me. You can see it still allows the steel to flex but it has killed the noise very much and im happy with the results. 1 2 Share this post Link to post Share on other sites
Pullstart 62,812 #13 Posted March 6, 2021 Mick, I was going to suggest sound deadening mat, but you beat me to it! Carry on! 1 Share this post Link to post Share on other sites
Mickwhitt 4,593 #14 Posted March 6, 2021 This stuff is pretty good for how thin it is. Most car bonnets have an X shaped brace welded in there to reduce the flex as well as some form of deadening mat. This stuff says it will kill panel noise as dead as a do do. 1 Share this post Link to post Share on other sites
tunahead72 2,411 #15 Posted March 6, 2021 Funny, I didn't see a gin glass in that video. Share this post Link to post Share on other sites
Pullstart 62,812 #16 Posted March 6, 2021 36 minutes ago, Mickwhitt said: Most car bonnets have an X shaped brace welded in there to reduce the flex as well as some form of deadening mat. I bet you could use fleece and fiberglass resin to build an X underneath too Share this post Link to post Share on other sites
Stormin 9,981 #17 Posted March 6, 2021 Being somewhat deaf does have advantages. 1 Share this post Link to post Share on other sites
Lee1977 6,648 #18 Posted March 6, 2021 They made a change on the later 300, 400 and 500 models. Share this post Link to post Share on other sites
