I am about to order all parts so that I can start re-installing the V in June.
However, my dilemma right now is if I should re-install the secondary air system or not.
I tried to search a thread on this, but I might get stuck by using the wrong wording.

Besides of a less clogged V, how much is removing going to influence the idle emissions (cause that is the only thing they check here, probe in the exhaust at idle)?

 

Air injection is for start up emissions, it helps the catalytic converter come up to temperature faster and start working. I don't know when the change was, but the later cars have an electric pump with a clutch, so it kicks in on startup for about 45 seconds to a min and then cuts out after that.

It does help emissions and there is no performance penalty to keeping it.

 

If your tests are done with a warm engine or the engine emissions are tested more than 45 seconds after startup, the air pump will have no effect because it will not be working. If indeed the system is actually working at all.
The emissions it saves (if working) are totally insignificant.
In your place I would get rid of it and replace it with the idler pulley setup. This transforms the serviceability of the engine.

 

Right, warm engine, so it is clear that one's got to go .. both of you thanks for the quick response, saves me buying the seals.

Do you by any means know the words to search on what and how to remove?
Is 'air injection" the right wording?

 

Eric
I happen to have just done this on a friend's car. You need to source a pulley and adjusters from a non-air pump car. This is a bolt-on replacement for the entire pump and its pulley and fixing structure. You currently have this:
https://www.jaguarclassicparts.com/u...pump-5-3-litre

And it has to be replaced with this:
https://www.jaguarclassicparts.com/u...ment-5-3-litre

They are available from breakers in the Uk, no problem, but a bit of postage to you, obviously.
To remove the pump itself is pretty straightforward. Removing the air pipes and the little thin pipes to the manifold is a fiddle but doable too. There is one large feed pipe from the pump along the bottom of A bank manifold and up to the rear of the V where it connects to the air pipes on top. As your engine is out, removing this is easy. If not out, just leave it in place. Just cut the flexibles you find.
Then the holes in the manifold need to be sealed. A quick tap of the hole and a nice stainless allen headed screw with some locktite looks good. Or you can get the dedicated fix here, third one down "smog caps":
Rushton Engineering - Our Products

 

Hi Greg,

OK, that confirms what I more or less figured out.

That means I just remove (what can be removed) everything connected to the system from the pump till the pipes (which are out already) right?

I guess I can let the pump act as a pulley for trial runs of the engine?
I really want to be sure the engine is sound before putting more money in the car.

 

That means I just remove (what can be removed) everything connected to the system from the pump till the pipes (which are out already) right?
Right
I guess I can let the pump act as a pulley for trial runs of the engine?
I really want to be sure the engine is sound before putting more money in the car.
You can. But believe me, the engine IS sound. You drove it home OK!

 

Yeah, I am sure as well, but procedure is procedure, that's the German part in me .
And ... £110 for 12 caps and o rings ... I don't think so .