[xj] remove, check and replace AAV 87 Series 3 - was CSI

XJ
1

Thank you for the kind advice with checking my CSI. It was
indeed blocked, I paid the visit to Harbor Freight, and the
little ultrasonic cleaner did the trick. I will comment that
the two second ‘spray’ was actually a jet, and not a fine spray.

I wish to check the AAV. The hose that led topside from the
AAV to …somewhere pulled off the unit with my hand, it was
very loose. I found it a long process to loosen the two
downward bolts that held the AAV to the engine. Now I can
pull it a very little way from the engine but no more -
doubtless held by the other vacuum hose behind, I can feel
the elastic resistance.

What are the consequences of my giving it a firm pull ?
should there be enough slack in the hose behind the unit to
allow it to come forward, or will I be facing a trip under
the car to reinstall the hidden hose ?

There is little help in the parts manual or even the Jaguar
CD-ROM on this subject, so all comments are appreciated.

My reason for attempting to pull the AAV is that it is not
easy to visually inspect if I leave it in place. And I like
tinkering with her.

Dave Hardy
San Diego
87 Cranberry XJ6 88,000 miles–
David Hardy
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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2

In reply to a message from David Hardy sent Fri 17 Apr 2009:

David!
Once you take those 2 allen screws out, remove the forward
hose clamp to take the hose off then pull the AVV foreward
to take the rear hose off.
No need to get under the car.

                                    Walter--

The original message included these comments:

I wish to check the AAV. The hose that led topside from the
AAV to …somewhere pulled off the unit with my hand, it was
very loose. I found it a long process to loosen the two
downward bolts that held the AAV to the engine. Now I can

–
Walter Schuster 78XJ6 FI Ser.II, 69E Ser.II 2+2original
Albuquerque/New Mexico, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers

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3

In reply to a message from David Hardy sent Fri 17 Apr 2009:

It may be possible for you to pull the AAV far enough out to
loosen the clip holding that hose to the AAV but I wouldn’t bet on
its flexibility. When I tried it, the ancient hose behind the AAV
broke off as it was so perished. The hose isn’t for vacuum - it
carries extra air for the intake when the engine is cold.

The other end of that hose goes to a fitting on the underside of
the inlet manifold: I was able to get at it from the front to
loosen it clip. My right elbow was down by the distributor (with
distributor cap removed) and then my arm was reaching rearward
below the manifold.

I managed to install a replacement hose OK but did it all by feel.
I attached the new hose the the back of the AAV first, then
installed the AAV and lastly attached the new hose to the fitting
under the manifold.

Good luck

David–
The original message included these comments:

What are the consequences of my giving it a firm pull ?
should there be enough slack in the hose behind the unit to
allow it to come forward, or will I be facing a trip under
the car to reinstall the hidden hose ?

–
David Womby 78 XJ6L 5speed
Mount Dora, Florida, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers

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4

David Hardy wrote:

Thank you for the kind advice with checking my CSI. It was
indeed blocked, I paid the visit to Harbor Freight, and the
little ultrasonic cleaner did the trick. I will comment that
the two second ‘spray’ was actually a jet, and not a fine spray.

I wish to check the AAV. The hose that led topside from the
AAV to …somewhere pulled off the unit with my hand, it was
very loose. I found it a long process to loosen the two
downward bolts that held the AAV to the engine. Now I can
pull it a very little way from the engine but no more -
doubtless held by the other vacuum hose behind, I can feel
the elastic resistance.

What are the consequences of my giving it a firm pull ?
should there be enough slack in the hose behind the unit to
allow it to come forward, or will I be facing a trip under
the car to reinstall the hidden hose ?

There is little help in the parts manual or even the Jaguar
CD-ROM on this subject, so all comments are appreciated.

My reason for attempting to pull the AAV is that it is not
easy to visually inspect if I leave it in place. And I like
tinkering with her.

Which is fair enough, David - but the unit is easily function tested,
but not repaired, in situ…:slight_smile:

Normally there is enough slack to access the hoseclip holding ther AAV
to the back hose - but a PO may have used David’s equally pertinent
method, leaving too little slack. And/or have cut the hose to eliminate
a split, or whatever - with the same reult…

A hefty pull may or may not disengage the hose from the AAV, depending
on how hard the clip is tightened. No damage to the AAV is likely, but
if nothing gives with a moderate effort there is no other way than
detaching the other end of the hose - and pull the whole assembly out.
Which may be just as well for a better inspection, and eventual renewal,
of the hose - even if more inconvenient…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers

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