Spark Plug Myths re: 1999 XJ8 VDP FAQ
Joined: Sep 2010
Posts: 2,114
Likes: 976
From: Indianapolis, IN
Those part numbers I listed would be good for Jag V8's up to the 2010 5.0L direct injected engines, they are vastly different.
Cheers,
Joined: Sep 2010
Posts: 2,114
Likes: 976
From: Indianapolis, IN
Thank you very much for this information xjrguy! I ordered a set of 8 iridium NGK and as soon as they arrive I'll let you know how my jag is working.
As much as I understand this part № are the official from Jaguar... I have looked around for a cross-reference and, correct me if I'm wrong, but the NGK part number for the same spark plugs is the mentioned BKR5EIX11 No. 5464. Is that right?
And about the gap... as soon as the spark plugs are here I'll check and refit the gap as you said - to 0.9 - 1.0mm.
Thank you once again.
As much as I understand this part № are the official from Jaguar... I have looked around for a cross-reference and, correct me if I'm wrong, but the NGK part number for the same spark plugs is the mentioned BKR5EIX11 No. 5464. Is that right?
And about the gap... as soon as the spark plugs are here I'll check and refit the gap as you said - to 0.9 - 1.0mm.
Thank you once again.
Pardon me for not thinking of that, all our fuel here is unleaded by mandate.
Just be sure to check the gap with a non-metallic gauge.
Cheers
To be honest - every time I refuel my car I'm afraid what garbage from the petrol could enter my tank... An year ago i had my mercedes with a frozen fuel pomp at -20C because of "quality" fuel... And as I understand the jags are very susceptible to bad fuel
I expect the new iridium NGK plugs to arrive at the end of this week and I'll post any further updates over another issue: https://www.jaguarforums.com/forum/x...t-start-62751/
Joined: Sep 2010
Posts: 2,114
Likes: 976
From: Indianapolis, IN
Hello Everyone,
I see more opportunity to add content clarity about Anti-Seize compounds and plating comments.
Well to answer the comment about spark plug "plating"... No, it has never been the normal mode of manufacturing since dinosaurs roamed the earth to have plating done on spark plugs.
In fact, NGK ONLY STARTED PLATING IN DECEMBER OF 1999. Well past the printing of the 1999 Jaguar Vandan Plas XJ8 manual. So no, the plating never was available at the time the manual was written as other have previously written in the thread.
Hopefully that thread has now been put aside.
Next comment to clarify: ANTI-SEIZE COMPOUND USE
The NGK plating used is Trivalent Chromate not being a heavy metal and more environmentally friendly that Hexavalent Chromate. You never use any anti-seize compounds on these coatings....Why you ask? Well simply when used they actually present false torque readings. These coatings make it so anti-seize compounds are not needed, nor should ever be used.
I appreciate the opportunity to clarify this thread and hope the engineering misstatements are done.
Sincerely,
<<<Mathew>>>
I see more opportunity to add content clarity about Anti-Seize compounds and plating comments.
Well to answer the comment about spark plug "plating"... No, it has never been the normal mode of manufacturing since dinosaurs roamed the earth to have plating done on spark plugs.
In fact, NGK ONLY STARTED PLATING IN DECEMBER OF 1999. Well past the printing of the 1999 Jaguar Vandan Plas XJ8 manual. So no, the plating never was available at the time the manual was written as other have previously written in the thread.
Hopefully that thread has now been put aside.
Next comment to clarify: ANTI-SEIZE COMPOUND USE
The NGK plating used is Trivalent Chromate not being a heavy metal and more environmentally friendly that Hexavalent Chromate. You never use any anti-seize compounds on these coatings....Why you ask? Well simply when used they actually present false torque readings. These coatings make it so anti-seize compounds are not needed, nor should ever be used.
I appreciate the opportunity to clarify this thread and hope the engineering misstatements are done.
Sincerely,
<<<Mathew>>>
Cheers,
Last edited by xjrguy; Nov 30, 2011 at 06:27 PM.
Veteran Member
Joined: Feb 2011
Posts: 9,733
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From: on-the-edge
antiseize
The pdf says:
Applying anti-seize to the threads of spark plugs that have a metal plating allows the installer to mistakenly over-tighten the spark plug in the cylinder head; ...
A installer who understands the behaviour of antiseize and makes the appropriate adjustment is not going to to do this. There are tables all over the interwebs of the required reduction in torque. Some of them are on the manufacturer sites.
Angle torquing is not affected by the presence or absence of antiseize.
Applying anti-seize to the threads of spark plugs that have a metal plating allows the installer to mistakenly over-tighten the spark plug in the cylinder head; ...
A installer who understands the behaviour of antiseize and makes the appropriate adjustment is not going to to do this. There are tables all over the interwebs of the required reduction in torque. Some of them are on the manufacturer sites.
Angle torquing is not affected by the presence or absence of antiseize.
Veteran Member
Joined: May 2010
Posts: 1,887
Likes: 344
From: NE
Missing Technitions
I have noticed that the forum has lost numerous technicians that at one time frequented.
Any ideas? -- we still have at least one ..........and that is to be appreciated.
I remember a discussion quite a while ago where one guy was getting a bit frustrated with some of the argumentative posts ... did they just leave?
Any ideas? -- we still have at least one ..........and that is to be appreciated.
I remember a discussion quite a while ago where one guy was getting a bit frustrated with some of the argumentative posts ... did they just leave?
Joined: Sep 2010
Posts: 2,114
Likes: 976
From: Indianapolis, IN
I have noticed that the forum has lost numerous technicians that at one time frequented.
Any ideas? -- we still have at least one ..........and that is to be appreciated.
I remember a discussion quite a while ago where one guy was getting a bit frustrated with some of the argumentative posts ... did they just leave?
Any ideas? -- we still have at least one ..........and that is to be appreciated.
I remember a discussion quite a while ago where one guy was getting a bit frustrated with some of the argumentative posts ... did they just leave?
My two cents..........
Senior Member
Joined: Feb 2010
Posts: 556
Likes: 46
From: TEXAS
Thanks for the info. I am going to pick up some of the NGK 5464 (BKR5EIX-11) plugs and am glad to hear they are already around 0.040" gap, mz_biteme. I am going to reduce it from there a little and install these puppies!
Senior Member
Joined: Mar 2011
Posts: 473
Likes: 17
From: Tucson
Just bought these for my 03 vdp, using unleaded.
Not sure what that P number stuff is above.
I think the BKR is the correct plug for my car.
56.00 shipped from Rock.
Senior Member
Joined: Sep 2010
Posts: 173
Likes: 15
From: Netherlands
Can anyone tell me if i can use iridium plugs for my '99 xjr ?
xjrguy suggested they are better then platinum plugs , but are they competible with the AJ26 engine ?
Jaguar only states them for the AJ27 , don't know why exactly ...
xjrguy suggested they are better then platinum plugs , but are they competible with the AJ26 engine ?
Jaguar only states them for the AJ27 , don't know why exactly ...
Joined: Sep 2010
Posts: 2,114
Likes: 976
From: Indianapolis, IN
My guess would be, if you could find an iridium plug built for a .050 in. gap in the proper heat range, you'd be set.
Cheers,
Senior Member
Joined: Jan 2010
Posts: 110
Likes: 92
From: Kansas City, MO
Which seals are you referring to? The spark plugs come with compression washers already. The only other seal would be the o-ring in the spark plug well, and you'd have to remove the whole vale cover to get to those. If there is no oil/sludge in the spark plug wells, you don't have to worry about the o-rings. Just pop the coil cover off, remove coils, replace plugs, put everything back together, you're done. 1hr job with cleanup.
Senior Member
Joined: Nov 2011
Posts: 242
Likes: 16
From: Denvile NJ
Which seals are you referring to? The spark plugs come with compression washers already. The only other seal would be the o-ring in the spark plug well, and you'd have to remove the whole vale cover to get to those. If there is no oil/sludge in the spark plug wells, you don't have to worry about the o-rings. Just pop the coil cover off, remove coils, replace plugs, put everything back together, you're done. 1hr job with cleanup.
thanks for the answer!!
Senior Member
Joined: Feb 2010
Posts: 556
Likes: 46
From: TEXAS
I got the NGK 5464s. I still need to put them in, but I am more worried about yanking my door handle and latch at the moment. I looked up the spark plugs on advance auto parts. Picked them up from my "local" Advance for about $56 with my discount.