Help with a non-starting 3.8

Fuel tanks, fuel pumps, carburetors etc.
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cass3958
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Re: Help with a non-starting 3.8

Post by cass3958 »

Below is a photo of my bridge piece as I stripped it down the first time. The Banjo bolt is loose but not dismantled at this point. I do not know if this is the original assembly but it shows the alloy washer between the bottom of the carb and the top of the bridge and a fibre washer over the head of the banjo bolt against the base of the bridge.
IMG_8188.JPG
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When I reassembled the carbs though I came across this diagram which shows in colour where the fibre washers and alloy washer goes so I reassembled it to this spec. 42 just says washer which I took to be a fibre washer so I placed fibre washers either side of the alloy washer on the banjo bolt as per the last photo of it reassembled.
SU Carb Diagram.jpg
SU Carb Diagram.jpg (37.46 KiB) Viewed 1722 times
IMG_8211 (2).JPG
IMG_8211 (2).JPG (534.05 KiB) Viewed 1722 times
Rob.C. P1B8973BW
1968 S Type 3.4 Auto. Old English White.
1993 Yamaha FJ1200 Yellow
1966 Ford Anglia 1760 cross flow (still being built)
2012 Old English sheep dog. Grey and white.
http://torbayweddingcarclub.co.uk/?page_id=57
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Glyn Ruck
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Re: Help with a non-starting 3.8

Post by Glyn Ruck »

I don't think your carbset is original S Type not that it matters. Does your engine number match?

Anyway to assist with Cass excellent pics & try and answer your bridge piece question. Some Thermo carbs had a pipe with banjo fittings on it.

AED Reversable arm..JPG
AED Reversable arm..JPG (185.58 KiB) Viewed 1717 times
1965 Jaguar 3.8 S Type, Sync4, OD, PAS, BRG/Biscuit on chrome wires.
http://www.jagstyperegister.com/forum_n ... ?f=3&t=152
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cass3958
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Re: Help with a non-starting 3.8

Post by cass3958 »

It does look as though your carbs have been messed with if not changed. I noticed in your photo with the red background, if that is a picture of your carbs, that the bridge piece support between the Carb and AED is upside down. Indicated here with the yellow arrow, when compared to mine in the second photo.
SU HD6.jpg
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IMG_8184.JPG
IMG_8184.JPG (4.24 MiB) Viewed 1710 times
Also your float chamber tops are a different design or appear to be. (It might just be the angle of the photo.)
Rob.C. P1B8973BW
1968 S Type 3.4 Auto. Old English White.
1993 Yamaha FJ1200 Yellow
1966 Ford Anglia 1760 cross flow (still being built)
2012 Old English sheep dog. Grey and white.
http://torbayweddingcarclub.co.uk/?page_id=57
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Glyn Ruck
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Re: Help with a non-starting 3.8

Post by Glyn Ruck »

The pics I show with red background are just plucked from the internet at some time off a Mk2 IIRC. Mine are as yours Rob. I just wanted to show the T piece & rubber pipe arrangement to the OP. The support bracket appears assembled upside down.

The bridgepiece diagram is purely to show that it is purposely reversible.
1965 Jaguar 3.8 S Type, Sync4, OD, PAS, BRG/Biscuit on chrome wires.
http://www.jagstyperegister.com/forum_n ... ?f=3&t=152
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Treetrimmer
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Re: Help with a non-starting 3.8

Post by Treetrimmer »

Thanks once again for the replies. I apologise for attaching the same image of my A.E.D. twice in my earlier response.

Cass: My bridge piece is the same orientation as yours. I was slightly concerned because Glyn had provided some photos, ( intended solely to show the "plumbing" of the A.E.D) which showed the bridge piece rotated through 180 degrees, and I wondered what was the "correct" orientation. This is possibly just academic, as I think it work be fine either way round.
Thank you for the exploded diagram, in colour, you attached. Do you also have the "key" to that photo? I would be grateful for a copy (via a P.M. ?) if you do. Incidentally, your colour diagram shows the "pipe" exiting the A.E.D. vertically downwards, so not meant for an "S" type.

Glyn: I'm sure you're correct, and my A.E.D. set up is not original. My engine number, chassis number etc all tie up with the Heritage Certificate, and the chassis plate. I just hope my interpretation of the fibre washer arrangement is leakproof.

Regards, Richard
1965 Jaguar "S" type, 3.8 automatic
Mercedes SL 400
Land Rover Discovery 4 H.S.E.
awiedie
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Re: Help with a non-starting 3.8

Post by awiedie »

Have to get my two pence worth in here. The aluminum washer goes between the banjo and the cross piece, the fiber washer between the cross piece and the bottom of the front carb. Someone's photo showed the reverse. All washers at the starting carb end are fiber. Apparently, the cross piece can be reversed to change fuel levels in the carbs, however that's possible, but I have never tried that and under what circumstances would you? Come to think of it, maybe that would help with my poor idle problem.
1964 3.8 S Type LHD DG Auto Opalescent Silver Grey over red
1966 E Type FHC Carmen Red over black
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Glyn Ruck
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Re: Help with a non-starting 3.8

Post by Glyn Ruck »

There are many layouts & iterations of SU Carbs with as many common parts as possible. This crossover takes place equally between Thermo & Non Thermo units. The Burlen fuel systems site gives you every bit of info you could possibly require for the various "H" Range carbs. HERE IS THE LEGEND OF THE COLOUR DIAGRAM BELOW. It is not for an HD6 but gives you a good idea of some common parts & what they are called. Whenever ordering spares make sure you provide Burlen with the AUD number attached to the float bowl of your carbs. Much of the diagram is generic. e.g. covers both enrichment methods ~ pulling down the main jet against the diaphragm & the AED.

http://sucarb.co.uk/carbspec/carburetto ... s/id/1265/

SU Carb Diagram.jpg
SU Carb Diagram.jpg (37.46 KiB) Viewed 1693 times

Sadly the same data is no longer provided on the S Type
SU CARBS S TYPE.JPG
SU CARBS S TYPE.JPG (99.93 KiB) Viewed 1672 times

See SU Carb Application Guide in Word Document attached below.

On F & R tags attached by the float bowl "Nuts" as they are technically.
S.U. Carburettor Application Guide..doc
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Some typical of many links.


http://sucarb.co.uk/?SID=lb5uhp868tllcv ... __store=su

http://sucarb.co.uk/technical/

http://sucarb.co.uk/technical-hd-type-c ... enrichment


su_image-3311_original.jpg
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I can strongly recommend this book.

51ff0YEZ6iL._SX351_BO1,204,203,200_.jpg
51ff0YEZ6iL._SX351_BO1,204,203,200_.jpg (40.04 KiB) Viewed 1681 times
1965 Jaguar 3.8 S Type, Sync4, OD, PAS, BRG/Biscuit on chrome wires.
http://www.jagstyperegister.com/forum_n ... ?f=3&t=152
A1B56966DN
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Glyn Ruck
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Re: Help with a non-starting 3.8

Post by Glyn Ruck »

awiedie wrote: Mon Jul 05, 2021 6:09 pm Apparently, the cross piece can be reversed to change fuel levels in the carbs, however that's possible, but I have never tried that and under what circumstances would you? Come to think of it, maybe that would help with my poor idle problem.
Alan,
I would believe that changing the fuel levels would be dependent on what angle the carbs are mounted at. e.g. the Daimler V8.
1965 Jaguar 3.8 S Type, Sync4, OD, PAS, BRG/Biscuit on chrome wires.
http://www.jagstyperegister.com/forum_n ... ?f=3&t=152
A1B56966DN
Treetrimmer
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Re: Help with a non-starting 3.8

Post by Treetrimmer »

Please would someone enlighten me as to the correct sizes for the nut & bolts on the spindle couplings between front and rear carburettors.
My car is an automatic, and I'm especially interested in the nut/ bolt securing the "anti-creep switch operating lever" onto the throttle spindle connection assembly.

Thank you as always for the anticipated wisdom!

Richard
1965 Jaguar "S" type, 3.8 automatic
Mercedes SL 400
Land Rover Discovery 4 H.S.E.
awiedie
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Re: Help with a non-starting 3.8

Post by awiedie »

Norman,

I just happened to come across this topic from way back in June. You used a term unfamiliar to me - tickler pin. There is nothing like what you describe on my HD6s. Am I missing something?

Alan
1964 3.8 S Type LHD DG Auto Opalescent Silver Grey over red
1966 E Type FHC Carmen Red over black
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