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Old 07-07-2021, 07:46 PM   #1
Ray_aus
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Default Cracking bonnet protectors

I have just noticed my third bonnet protector on my 2018 Everest cracking, the original factory protector flew off the car after only a few months ( I hand just removed and reinstalled to clean under it ) and subsequently two others aftermarket protectors I purchased also cracked.
I made sure that the screws weren’t over tighten and even used Loctite on the screws so that they were not to tight.
On my last bonnet protector I started from scratch, I removed all the clips and used the new ones that came with the protector.
The positioned of the screw holes were all central.
The plastic did not appear to be under any stress at all.
This last one only lasted less then a month and driven under 100km at city speeds.
I do have a rhino bull bar and just wondering if it’s deflecting air up and under and stressing it.
Any thoughts would be appreciated.
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Old 07-07-2021, 08:03 PM   #2
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Default Re: Cracking bonnet protectors

expansion - contraction, vibration fatigue. ??
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Old 07-07-2021, 11:23 PM   #3
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Default Re: Cracking bonnet protectors

What brand? Are they cheap ones off ebay?
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Old 08-07-2021, 09:56 PM   #4
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Default Re: Cracking bonnet protectors

You may have Casanova fingers
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Old 10-07-2021, 06:00 PM   #5
Ray_aus
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Default Re: Cracking bonnet protectors

It was only 2 weeks old on and travelled less than 100 km.
The way it’s cracking I believe it’s due to Flexing it’s being lifted by and up-draught coming off the bull bar.
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Old 10-07-2021, 06:01 PM   #6
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Default Re: Cracking bonnet protectors

Both types factory and eBay.
I believe it’s due to flexing from an updraught created by the bull bar.
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Old 10-07-2021, 06:03 PM   #7
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Default Re: Cracking bonnet protectors

I may have over tighten the first one which I doubt but not the other two I used Loctite so that I wouldn’t over tighten them, finer tight with a small driver.
I believe it could be due to flexing from an updraught created by the bull bar.
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Old 10-07-2021, 06:03 PM   #8
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Default Re: Cracking bonnet protectors

Try reinforcing & painting??
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Old 10-07-2021, 06:27 PM   #9
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Default Re: Cracking bonnet protectors

Loctite nutlock etc. contacting with plastic makes the plastic go brittle.

Never use Loctite with plastic unless its the Loctite adhesive thats designed to be used with plastic.

I'd use nuts with nyloc inserts with the screws to ensure they don't loosen.
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Old 10-07-2021, 08:19 PM   #10
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Default Re: Cracking bonnet protectors

I would drill a bigger hole in plastic and fit a rubber grommet, the ID which would be the size of the bolt, and a small stainless washer or even fibrelock washer or both, and don't overnighter them, too rigid!


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Old 11-07-2021, 10:02 AM   #11
73 4V XB
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Default Re: Cracking bonnet protectors

Quote:
Originally Posted by Ray_aus View Post
Both types factory and eBay.
I believe it’s due to flexing from an updraught created by the bull bar.
Tie some ribbons to the top of the bar and see if it is actually creating an updraft.
Might help rule that out or not.
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