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Throttle body gasket.

naki_k
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Posts: 27631
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Throttle body gasket.

Postby naki_k » Sun Dec 24, 2017 5:04 pm

I wonder why the early 3.2’s do not have a throttle body gasket listed, where as 3.6 and early 4.0 do?
Then neither have them listed for battery in boot models.
Very odd.
I am going to start fitting them regardless I think, as I can’t see any reason not too. For a inlet manifold that needs to be air tight!
Just ordered a 10 pack! At 38p each, splashing out.

https://www.jaguarclassicparts.com/uk/part/EAC9822


None on 3.2’s.
https://www.jaguarclassicparts.com/uk/j ... -3-2-litre

But fitted on early 4.0.
https://www.jaguarclassicparts.com/uk/j ... -4-0-litre
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 3.2 XJ6 SportPack Manual
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6
93 6.0 XJ81 XJ12
94 4.0 XJR
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

katar83
Distinguished Mbr
Posts: 2434
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Throttle body gasket.

Postby katar83 » Sun Dec 24, 2017 5:57 pm

Surface is machined on later cars and Jaguar decided a gasket is not needed. Also gasket from early cars won't fit later cars.
I've used instant gasket on my cars but only when I had it apart, other than that I don't think its really needed.
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.

naki_k
Super Moderator
Posts: 27631
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Throttle body gasket.

Postby naki_k » Sun Dec 24, 2017 6:47 pm

katar83 wrote:Surface is machined on later cars and Jaguar decided a gasket is not needed. Also gasket from early cars won't fit later cars.
I've used instant gasket on my cars but only when I had it apart, other than that I don't think its really needed.


I did not notice a specific difference from early to late throttle bodies, other that the 94 version that has a water hose going through the bottom of it.
Even a machine surface won’t neceassry mate 100%?
It also didn’t explain why the same MY 3.2 did not have one, when the 4.0 did.
Last edited by naki_k on Mon Feb 05, 2018 11:54 am, edited 1 time in total.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 3.2 XJ6 SportPack Manual
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6
93 6.0 XJ81 XJ12
94 4.0 XJR
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

katar83
Distinguished Mbr
Posts: 2434
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Throttle body gasket.

Postby katar83 » Sun Feb 04, 2018 11:39 am

naki_k wrote:It also didn’t explain why the same MY 3.2 did have one, when the 4.0 did.


Parts availability?

Just had my TB cleaned up, damn it was dirty, I even had to lightly sand it with 800 to get to shiny metal as even after a lot of scrubbing with scotch pad I could still see a smudge where the butterfly parked(must have been some sort of a scale). Of course both IACV bolts snapped like they were made of butter so that added another hour of work to it :evil:

This the machined surface, the other side is similar, I suppose that's why a gasket isn't needed? I had to use a crowbar to remove it after getting the bolts off, it was stuck for good without any instant gasket. I might use some if I can find it though on reassembly.

Image

I really wish Jaguar used better bolts here

Image

It seems its the same story with 40s and x300s. I know its loctited but still, they snap so easily, plus you have to take the whole TB off to get to IACV bolt on the x300. I've cut bolts in the middle so hopefully if I ever have to remove it, I should be able to do it without removing the TB.

One thing I remember you had trouble with, it's this and associated high idle:

Image

I know that it looks like there is no adjustment possible here but if you loosen up these bolts the whole thing will move by a 1mm each side and that's enough to get the idle down back to normal(or very high). Either do it from underneath while car is running or remove the TB, plug the TPS in, turn ignition on so there is power to the sensor and adjust to one side(sorry cant remember which one), either check the current/adjusted value through an OBD scanner or on green/yellow cable. Remember that ~0.1V when closed, makes all the difference :)
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.


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