Bonnet adjustment

Technical advice Q&A

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phoenix
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#1 Bonnet adjustment

Post by phoenix » Tue Nov 14, 2023 3:29 pm

We have got the gaps correct on the bonnet but the latches wont lock unless you push it down at the back Altering the shims at the spring mechanism at the front . Will this help ?
S1 4.2 RHD Bryan

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Allrand
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#2 Re: Bonnet adjustment

Post by Allrand » Tue Nov 14, 2023 6:33 pm

There's a bit of wiggle room to adjust the receiving brackets, locking pawls, and locating pins and brackets.
Randall Botha
'64 3.8 fhc & '51 Mk 7 (now sold)

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phoenix
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#3 Re: Bonnet adjustment

Post by phoenix » Tue Nov 14, 2023 6:36 pm

No tried all that. We can get it to lock down but we have to lean on the bonnet above the latch.
It is a brand new bonnet and all new front frame.
S1 4.2 RHD Bryan

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abowie
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#4 Re: Bonnet adjustment

Post by abowie » Tue Nov 14, 2023 9:52 pm

phoenix wrote:
Tue Nov 14, 2023 6:36 pm
No tried all that. We can get it to lock down but we have to lean on the bonnet above the latch.
It is a brand new bonnet and all new front frame.
If what you're saying is that you need to push down on the rear edge to get the latch to engage then this is pretty normal. All my cars are like this.

Prior to installing the latches would the bonnet sit down flat at the rear?
Last edited by abowie on Tue Nov 14, 2023 10:28 pm, edited 1 time in total.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB. 1979 MGB.
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bitsobrits
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#5 Re: Bonnet adjustment

Post by bitsobrits » Tue Nov 14, 2023 9:53 pm

If the bonnet gaps are exactly where you want them, leave the hinge shims as they are. You should be able to adjust both the body mounted receiver and the bonnet mounted latch pin to get a good closing action without much force. Note there is a rubber cushion on the locating pin that needs to be installed correctly to facilitate this.
Steve
'65 S1 4.2 FHC (early)

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caveman
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#6 Re: Bonnet adjustment

Post by caveman » Thu Nov 16, 2023 11:13 am

abowie wrote:
Tue Nov 14, 2023 9:52 pm
If what you're saying is that you need to push down on the rear edge to get the latch to engage then this is pretty normal.
:yeahthat:
Steve
1965 S1 4.2 FHC (early)
:wavegreatbritain:

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phoenix
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#7 Re: Bonnet adjustment

Post by phoenix » Thu Nov 16, 2023 2:08 pm

Yes finally finished the bonnet fitting. Locks down and gaps near perfect but what a job . taking spacers out or replacing with different sizes.
Just a question at the front there is a thick spacer ( about 5mm) in the position to lift the bonnet on both sides ,is this normal ?
S1 4.2 RHD Bryan

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Allrand
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#8 Re: Bonnet adjustment

Post by Allrand » Thu Nov 16, 2023 3:49 pm

The thick spacer is there to adjust the horizontal joint to the rear of the wheel arch to get it parallel with the sill extention, and the vertical joint parallel with the bulhead. The thinner shims are for finer adjustments.
Randall Botha
'64 3.8 fhc & '51 Mk 7 (now sold)

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