Bonnet spring adjustment

Technical advice Q&A
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Andyp_67E
Posts: 61
Joined: Sat May 30, 2020 5:44 pm
Great Britain

#1 Bonnet spring adjustment

Post by Andyp_67E » Mon May 01, 2023 7:18 pm

Hi, Looking for a bit of advice.
My bonnet when opened would stay in position. For obvious reasons it started when I replaced the electric fan from a kenlowe mounted on a steel frame in the nose of the bonnet to a revotec mounted behind the radiator. The bonnet is close to staying open or if it does stay open any movement will start it closing. So just needs a bit more assistance.
Rather than renewing the springs is there any adjustment on the hinge position to increase the force to keep open?
As I see the hinges are slotted but cannot work out which way would increase the force?
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Andy
1967 Series 1 4.2 OTS
Leicester, UK

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bitsobrits
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#2 Re: Bonnet spring adjustment

Post by bitsobrits » Tue May 02, 2023 1:37 am

You need springs.
Steve
'65 S1 4.2 FHC (early)

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Geoff Allam
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#3 Re: Bonnet spring adjustment

Post by Geoff Allam » Tue May 02, 2023 4:25 am

Hi Andy. A simple fix for your bonnet is to add a couple of nylon washers to where the mechanisms attach to the picture frame. Then replace the nut with a nyloc and tighten to the point where there is a bit of resistance to movement. This will provide enough friction to keep the bonnet up.
Geoff Allam
67 series1 ots under restoration

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Allrand
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#4 Re: Bonnet spring adjustment

Post by Allrand » Tue May 02, 2023 8:34 am

Adjustment to the hinges is only to adjust the fully open position to stop the bumpers touching the ground.
Randall Botha
'64 3.8 fhc & '51 Mk 7 (now sold)

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Andyp_67E
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#5 Re: Bonnet spring adjustment

Post by Andyp_67E » Wed May 03, 2023 7:44 pm

Thanks all for your comments.
I checked the screws and nuts for tightness and found the one at the top of the vertical section very loose. Nipped both sides up a little, now the bonnet stays up.
Will keep an eye on it, and may replace the springs at a later date.
Andy
1967 Series 1 4.2 OTS
Leicester, UK

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