I want to remove my throttle body for a proper cleaning and in past digging through related posts, cannot determine whether there really is a gasket needed behind it or not. Does anyone know the final answer I need before I pull it off...should I have a gasket to put on or is none needed?

Oh yeah ...1997 XJ6 VDP which makes it a 4.0.

Thanks in advance!!
Bob

no theres not, if youre uncomfortable without one apply a very thin layer of hyloseal to the mating surface or thin layer of grease works too. you only want a seal of scrathches if there are any. This is a machined surface on both and jaguar felt there was no need. Although all later engines they evidently feel as confident about since they added either orings or gaskets to them.

Thanks for the quick reply Brutal. That info certainly simplifies things!

no theres not, if youre uncomfortable without one apply a very thin layer of hyloseal to the mating surface or thin layer of grease works too. you only want a seal of scratches if there are any. This is a machined surface on both and jaguar felt there was no need. Although all later engines they evidently didnt feel as confident about since they added either orings or gaskets to them.

I would be certain to put a bit of the afore mentioned to seal the TB. Otherwise, you could be dealing with a few issues related to too much air getting into the TB, resulting in a high idol.

IS THAT A GOLDEN CALF IDOL, OR AN AMERICAN IDOL
SORRY COULDNT PASS ON THAT 1

Brutal, keep that up and we will vote you off the island!

I'd have to say Pop Idol since the car is British. It's those American cars that have issues with American Idol. Oops.

Thank you TopHat. I was considering simply cleaning the mating surfaces well and assembling metal to metal, but if I could end up with idol problems that way, I will absolutely use a bit of sealant. I do not want any uncontrolable power surges in my 4.0!!!

Yeah. Good luck removing the TB. I gave it a go a few months back, and was absolutely unable to get the darn thing off. Seriously, I tried prying it off. Come to think of it, I wonder if a previous owner had it off, and used an appalling strong sealant...

I did get mine off easily and got it cleaned up. I posted some pics that might be helpful to someone who hasn't done one before.
https://www.jaguarforums.com/forum/a...p?albumid=1879
The touchest part was removing the TPS. The screws did not come out easily!

TopHatChef, you're probably right in that a previous owner might've used a curing sealant putting yours back together. However, since it is a flat, face to face mating between the TB and intake, I wonder if you'd be able to break it loose with a couple of screwdrivers placed in the mounting bolt holes and pry it off that way?

When I reassembled mine, I ended up using a thin film of grease as I couldn't find any Hyloseal (as Brutal suggested) locally. I did find out though that Permatex began selling Hylomar Universal Blue; a non curing sealant and I'll have to find some. I want to add that to my tool box for sure.

Thanks for the input Brutal and TopHatChef!

By the way TopHat, are you actually a chef? My son began cullinary classes last year and hopes to make a career of it.

Bob

Awesome,

I have the sticky throttle problem also, I need to get to that after I have the headliner in place. Quick question, do you think a different lubricant would be good on the springs in really cold place? It gets about -30F around here.

just removed mine today and thoroughly cleaned it. Man was it gummed up on the inside! Not a tough task, just made sure the return spring doesn't jump off the tb

Hello Billimanius. I am not aware of springs needing any lubrication. Just clean them well so there's no grease or grime to make things sticky and sluggish. Let us know how it goes for you...and by the way; welcome to the forums!! Hope you enjoy it and learn lots!

I can confirm on a 1997 XJR6 that there is no gasket between the throttle body and the superchartger bypass valve manifold. Even though there was no gasket, the TB was still quite stuck to the manifold and took a sharp whack from my hand to pop off. But the mating surfaces look clean with no sealant other than some minor corrosion. I think the oil from the crankcase ventilation, water and minor corrosion after 20 years just had them stuck fast to each other.

I've ordered some of the Permatex 85249 Hylomar mentioned above though for my reassembly just in case and I'll probably take some 1500 or finer grit sandpaper to the surface to clean it up.

It is odd that there is no gasket though. Even the SC bypass valve manifold has a gasket between it and the SC just inches away.

.

1. Use a sealer. I recommend Hylosil or Permatex Permashield 85420.
2. Replace the o-ring in the IACV, forgot the size, but it's an easy to find size...maybe 5/8" diameter

I may have a post specifying the details on the XJS pges

Thanks, would you recommend the Permatex Permashield 85420 over the Permatex 85249 Hylomar? Both seem to have good specs and are non-hardening/non-setting.

Where is there an o-ring on the IACV that would need replacement?


The following is an interesting thread discussing factory recommendations for Land Rover applications of sealers, etc:

Hylosil or RTV- any differences? - Land Rover Forums - Land Rover Enthusiast Forum

.

I suppose either would work, however for some reason, I feel I would go with the 85249 Hylomar product! Both are fuel resistant, which is what is important.

If you remove the two small 5.5mm bolts, you'll be able to pull out the IACV and notice a crushed orange rubber o-ring around the cylindrical piece that inserts into the hole of the throttle body.

http://winkay1.m.ec21.com/mobile/pro...uct_id=9589524

That picture should show the orange o-ring.

Good luck in removing the 5.5 bolts. They have locktite on them and I actually broke one. Luckily I had another throttle body and did not even make the attempt to pull them out.