Bonnet support frame

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peters3103
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#1 Bonnet support frame

Post by peters3103 » Fri Feb 14, 2020 9:13 pm

Hello gents,
With my engine out and front suspension soon to be dismantled for refurbishment, I’m wondering whether it’s wise/possible to unbolt and remove the bonnet support frame to repaint it as it’s a bit scruffy.

Cheers,
Pete
61 FHC
99 XKR FHC

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#2 Re: Bonnet support frame

Post by mgcjag » Fri Feb 14, 2020 9:47 pm

Hi Pete...yes quite easy to remove as well as the picture frame if you have engine/suspension out you might as well spruce it up...Steve
Steve
1969 S2 2+2 & Building a C type replica

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#3 Re: Bonnet support frame

Post by abowie » Fri Feb 14, 2020 9:54 pm

Bite the bullet and remove the engine frames, bag the wiring loom and now you can repaint the whole engine bay, frames and everything.

You can spray the frames in situ and I have did this on my first car but you have to paint the frame bolts and nuts which doesn't look 100%.

Image
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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#4 Re: Bonnet support frame

Post by peters3103 » Sat Feb 15, 2020 2:31 am

Thanks fellas, I’m not too keen to remove anything else so a complete frame repaint is out. It’s actually in quite good nick anyway, just the bonnet support is tatty from exposure to road debris.

Cheers,
Pete
61 FHC
99 XKR FHC

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#5 Re: Bonnet support frame

Post by abowie » Sat Feb 15, 2020 7:24 am

If everything else looks good then yes take the bonnet support off and paint it.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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#6 Re: Bonnet support frame

Post by peters3103 » Sat Feb 15, 2020 9:12 pm

The more I pull off the more I worry about putting back on :scratchheadyellow: Sure the frame would look better painted but where do you stop really. The few marks on it are obscured when the engine is in. This all started with a rattly timing chain!

Cheers,
Pete
61 FHC
99 XKR FHC

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#7 Re: Bonnet support frame

Post by abowie » Sat Feb 15, 2020 10:33 pm

Welcome to Shipwright's disease.

One thing to have a look at is if there are any cracks in the flat mild steel plate sections that the engine mounts go on. These do occur, and now is an easy time to get them welded.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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#8 Re: Bonnet support frame

Post by peters3103 » Sat Feb 15, 2020 10:45 pm

Thanks mate, I’ll have a look.
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#9 Re: Bonnet support frame

Post by peters3103 » Sun Feb 16, 2020 8:14 am

Bonnet frame & picture frame off for paint. A good opportunity to replace my hacked off cooling fan bracket too. Not sure if all my bolts are original but if they’re not I may as well replace them all with new ones.
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#10 Re: Bonnet support frame

Post by peters3103 » Sun Feb 16, 2020 8:42 am

BTW Andrew, engine mount area looks solid.
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#11 Re: Bonnet support frame

Post by peters3103 » Mon Feb 17, 2020 9:09 pm

I’ve been advised by a specialist bolt supplier that the bolts for my picture frame/bonnet support frame and wishbone attachment should be black anodised. Correct?
61 FHC
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#12 Re: Bonnet support frame

Post by abowie » Tue Feb 18, 2020 1:10 am

The JCNA Series one Concours Guide says:

"SUBFRAME BOLTS Bees, GKN, RO, Cranes, Richards, or Ruby Owen - black oxide or cadmium on late 4.2. Cadmium (see footnote A) plated nylock nuts"

I have stripped a number of 3.8 and 4.2 cars (>10) and have not personally ever seen black oxide bolts; they have always been cad plated. So we always go with zinc plated original bolts.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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#13 Re: Bonnet support frame

Post by peters3103 » Tue Feb 18, 2020 3:40 am

JCNA judging guide footnote A reads:

Although the original Jaguar production line photos such as Porter pages 163, 167, 249, 379 all show unpainted subframe bolts, from surviving original cars we know that some were painted.

Presumably this would refer to the picture frame bolts too not just those attaching the frame to the monocoque?

I seem to have a mixture of bolts of course. Some the brands mentioned above and some ring-ins.
Interestingly some are in fact black (CAD I think).
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