Has anyone ever removed the air pump and the maze of hoses on a V12 HE? I live in a place where any vehicle older than 96 isn't tested for pollution controls and mine is an 83. I'm in the process of pulling the motor and replacing it with an 85 HE and I'd like to simplify and clean up under the hood as much as possible.

 

I have removed mine, and the A/C system too. I don't use it. The only stopping thing is a dummy pully to keep the A/C comressor. I have next to take the spider tubes going down in to the intake. Oddly my 84 has become much easier to work on. LOL

Runs perfect without it!!


Brian Felts

 

http://www.bernardembden.com/xjs/index.htm
Full details here for this and many other jobs. Thank you Bernie.

 

Awesome! Thanks guys!
I plan on keeping the A/C, but the airpump, rails and various hoses are going bye bye.
This should make working on it somewhat easier, not to mention without the exhaust tubes coming up the back it will be easier to get to the transmission bolts.
Anything else I can eliminate while I've got the engine out? EGR, vac hoses?
Thanks again!

 

Just bumping this up to find out about removing ERG valves...
Thanks!

 

You don't have an EGR valve.

A lot of the hoses you see are for the rather bizarre vacuum advance system. I byassed all of them on my V12 and ran the vac advance to a ported vacuum nipple.

Others are for climate control, cannister purge, fuel regulators, fuel temp switch, and cruise control so be careful with your rippin' and tearin' :-)

Cheers
DD

 

ahhh! This is exactly why I asked!
So where did you attach the vac advance to?

 

Oh, jeeeezzzz....it was years ago! I think it was a ported source (as opposed to contant vacuum) on the underside of the throttle body.

Or maybe above the thottle body?

Easy enough to check: you want one that doesn't have vacuum at idle but DOES have vacuum just as the throttle is cracked open.

Cheers
DD

 

I'll have to search to find one.
To me, the look of the V12 is almost art. The only thing that spoils it is the congestion of crap they were required to put on it as an afterthought. I'd like to clean it up as much as possible.

 

That is True. Reminds me of something a guy said when I showed him the V12 for the first time- "if you poured a glass of water on that, it would take all day for it to finally hit the ground"- alluding to how tightly packed everything is.

 

Isn't that the truth!
Today I think I found what caused the demise of the engine that was in it. One of the smaller coolant hoses had a split in it near the base. I never would have seen it if I hadn't been removing it. It's a shame because it looks like the owner had done routine maintenance regularly.
At least now with all the wiring, hoses and the intakes removed I can see the top of the transmission!

 

Hi Les! I looked at the URL you provided for details on removing the air pump and I don't see it???

Bo...

 

I'm glad you made this comment. At first I was a little irked.."Oh another person whining about the XJSs hp trying to squeeze fractions of 1hp out of deconstructing the car."

But for the sake of bringing the V12 down to it's simplest form? I can appreciate that. I have an extra v12 that I'd like to rebuild in case mine kicks the bucket and it kind of made me think about rebuilding it as simply as possible and really polish it up.
Wiring and hoses definitely affect all of that a lot. It don't think it will ever look like an old XK engine but there is definitely room for improvement. Good luck mate

 

This was an older post, but I did eliminate the pump and the a/c because mine is a convertible. It takes less than 15 min to change the plugs now and it looks sooo much nicer!

 

the ac doesn't give me trouble, its the freaking throttle tower gets in the way!!! I drilled it out to make it easier to remove

 

Hey Bo, sorry that just shows the air rail removal process. someone else showed how to build a jockey pulley (Ed.? help please Doug) to replace the pump, so the belt routing still works.
did the link work ok for you?

 

I found a person in the UK who sells used parts and purchased the pulley assembly that they have which has no air pump. It is just a tensioner pulley for the ac belt at that point.

 

Ok...thanks Les!!!

 

Oh and yes...sorry...the link did bring me to a list of projects.

 

All Im running on mine is a generator, nothing else! It adds quite a bit of HP and make working on it a breeze to say the least.