Bonnet wont stay up on its own

Technical advice Q&A

Topic author
david.coan
Posts: 18
Joined: Mon Dec 10, 2018 7:10 pm
Location: Reading, UK
Great Britain

#1 Bonnet wont stay up on its own

Post by david.coan » Sun Apr 14, 2019 7:44 am

My 1968 series 1.5 ots bonnet wont stay up, is there adjustment? The car is just back from a classic car specialist after a few months away being converted to RHD and conversion to triple SU. Before the car went away the bonnet would stay up once opened on its own.

Link:
BBcode:
HTML:
Hide post links
Show post links


Durango2k
Posts: 1359
Joined: Fri Feb 11, 2011 11:59 pm
Location: Germany
Germany

#2 Re: Bonnet wont stay up on its own

Post by Durango2k » Sun Apr 14, 2019 8:22 am

I read somewhere you can pre-adjust the spring arm mechanism, it has long holes to be slid up and down.

Yours truely has still to understand how it works, but that seems a way to go, maybe together with new springs.

Furthermore it is often said that bondo filled bonnets do not stay open, I guess it depends how much bondo was used where on it :-), and it is a must to fit all the chrome parts on the nose, if you look at the axle the whole giant swings around you see why.

Hopefully someone chimes in with an explanation for the spring pre-tension.

Carsten
Jag E '66 S1 2+2, Citroen DS 23 Pallas iE, Citroen SM 3.0, Concept Centaur MK1, Citroen 11 BL '54, Sinclair C5, Velosolex

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

abowie
Posts: 2240
Joined: Wed Sep 07, 2011 9:15 pm
Location: Australia
Contact:
Australia

#3 Re: Bonnet wont stay up on its own

Post by abowie » Sun Apr 14, 2019 8:25 am

david.coan wrote:
Sun Apr 14, 2019 7:44 am
Before the car went away the bonnet would stay up once opened on its own.
I'd be asking then to fix it.
Andrew.
881824, 1E21538. 889457..oops
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Jaglex
Posts: 73
Joined: Wed Sep 25, 2013 2:42 pm
Location: Hamburg
Germany

#4 Re: Bonnet wont stay up on its own

Post by Jaglex » Mon Apr 15, 2019 2:49 pm

Carsten is right, you can adjust the "upforce" by loosening the srcews that fix the hinge to the (opened) bonnet and slide the hinge (relative to the bonnet) up or down. I don't recall which way increases the upforce, but you'll know, when you look at it - or after you tried it.
It's an easy and pretty quick one-man-job - unless the screws are rotten.
Enjoy sticking your head under the bonnet without carrying it with your head.
Ser. 1.5 DHC LHD

Link:
BBcode:
HTML:
Hide post links
Show post links


Topic author
david.coan
Posts: 18
Joined: Mon Dec 10, 2018 7:10 pm
Location: Reading, UK
Great Britain

#5 Re: Bonnet wont stay up on its own

Post by david.coan » Wed Apr 17, 2019 7:59 am

Thanks for the advice, it was now obvious once i looked that the spring balance brackets had not been replaced and tightened in their previous position when the garage put the bonnet back on. A quick loosen on the 4 bolts on one side, slide the bracket so that the 2 bolts for the bonnet in the bracket slots were closer to the slots top , retighten, same on the other-side and the bonnet then stayed up in its max opening on its own. But then i discovered the bonnet would not close! , so i had to slacken off and now i have a very weak self balance, but at least it closes. So it must be tiny adjustment needed to find the sweet spot. I think i will buy an adjustable bonnet prop too.

Link:
BBcode:
HTML:
Hide post links
Show post links

Post Reply Previous topicNext topic