Vacuum Hoses/Pipes to Air Filter Boxes. V12

SESH · Post by **SESH** » Sat Feb 05, 2011 7:43 pm

Hi, has anyone got a diagram of where all the pipes and hoses go from the carbs to the V12 air filter boxes. I have taken the whole thing apart for restoration and am now trying to fathom out where all the pipes and hoses go and I can't find reference to them in the books I've got.

Thanks. Mike.

SESH · Post by **SESH** » Sun Feb 06, 2011 9:49 pm

Or can anyone post a photo or e mail me a photo from their engine showing where the pipes/hoses go to/from.
Thanks
Mike.

SESH · Post by **SESH** » Tue Feb 15, 2011 5:29 pm

Any help anyone.
Thanks Mike

Post by **1954Etype** » Tue Feb 15, 2011 6:34 pm

SESH wrote:Any help anyone.
Thanks Mike

Mike, can't help (6 cylinders too many for me!). Try going on to www.xkedata.com and trawling through the cars there as there are lots of photos. Alternatively, Phillipe is an ace with a camera and he owns a lovely V12..........

SESH · Post by **SESH** » Tue Feb 15, 2011 6:52 pm

Thanks for the link I will have a look.
Hopefully Phillipe my be along soon with his expert advice.
Cheers
Mike

e-bygum · Post by **e-bygum** » Tue Feb 15, 2011 7:55 pm

Mike
The parts manual has diagrams showing where the vacuum pipes connect for different chassis numbers. Different spec. cars were sold into different markets in different years, it is therefore not possible to give you a definitive answer without knowing more details about your car. Photos would need to be from a car of the same spec, chassis number range etc. as yours.

To answer your specific question about pipes from the carbs. to the air filter boxes as far as I am aware there are no pipes connecting these components. There is a small diameter vacuum pipe on each side which goes from the inlet manifold to the temperature sensor in each air box.

SESH · Post by **SESH** » Tue Feb 15, 2011 8:25 pm

Hi Pete,

There are vacuum pipes that go from the front section of each air filter box just before the rubber connectors to the trumpet section, to somewhere? (I presume these go to the manifold?) Then some vacuum pipes go into the centre of the air filter section, one routes via an AC valve in the middle of one side only and then back out again. (although there isn't a similar valve on the other side). Then there are two metal pipes with rubber connectors that go into opposite ends of the air filter box. It get confusing. The car is an AUG 1973 Build. RHD. UK Spec. Engine No 7S 12621 SA. Chassis No 1S 2068 BW. Cheers Mike.

e-bygum · Post by **e-bygum** » Tue Feb 15, 2011 9:12 pm

Mike
The vacuum pipe at the front end of each air box connects the vacuum capsule(servo) which operates the air diverter to the temperature sensor (AC valve). The other side of the temp. sensor connects to the manifold. This system is on both sides of the engine. It's purpose is to reduce engine warm up time when started from cold (to reduce emissions).
When cold the temp. sensor is open and allows vacuum to be applied to the servo. This moves the flap inside the front of the air box to close off the cold air path through the trumpets and divert warm air from off the exhaust manifold to the carbs. When the engine has warmed up the temp. sensor closes removing vacuum from the servo and returning the air flap to it's rest position restoring the intake air flow from the front of the car.

SESH · Post by **SESH** » Tue Feb 15, 2011 9:53 pm

Thanks Pete,
I now need to find the point on the manifold where the rubber pipe fits. Plus I have a small issue that the A/C valve is missing on one side and there is a plastic stent joining the two rubber pipes (in & out) inside the air filter box. I presume I should have anothe A/C valve in there.
If you could point me in the right direction in finding the point on the manifold where the pipe joins that would be great. Thanks for your help. Cheers Mike. (that will teach me to pull things apart without taking pictures first!!)

vipergts · Post by **vipergts** » Tue Feb 15, 2011 10:26 pm

It might be easier to pop over to sunny Kent and take a look at mine. I remember scratching my head for ages over this one.

SESH · Post by **SESH** » Tue Feb 15, 2011 10:44 pm

Thanks for the offer, really appreciated, it just might come to that if I can't sort it !!

e-bygum · Post by **e-bygum** » Tue Feb 15, 2011 11:14 pm

Mike
You might find one or more of these diagrams useful.

http://tinyurl.com/66n6564

There should be two temp. sensors, one each side. If one is missing you should plug the vacuum so that the servo is inoperative otherwise it will feed hot air into the air box all the time. I don't know if it would be harmful to run the engine with only one side working. This system is an emissions thing and can quite safely be dispensed with provided that you block the vacuum lines. Personaly I would have either both sides working or none at all.
The vacuum take offs for the temp. sensors are as follows (to quote the ROM):
"Vacuum pipe runs to rear inlet manifold from left hand air cleaner and to front inlet manifold from right hand air cleaner."

SESH · Post by **SESH** » Tue Feb 15, 2011 11:33 pm

Thanks Pete, sounds like they should both be blocked off. If it's only an emmissions issue can't see the point. I wonder how many of these actually work on our cars anyway!

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Vacuum Hoses/Pipes to Air Filter Boxes. V12

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