XJ40 ( XJ81 ) 1986 - 1994

V 12 6.0 Spark Plugs

 
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Old 08-11-2018, 05:41 AM
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Default V 12 6.0 Spark Plugs

Hey Folks.

I was checking the parts numbers for my 94 V 12 for the correct plugs, Jaguar says the "new" plug number is NAB 3850DA, have not found more than 4 or 5 on any one site.
from what I have read the NGK BR6EF is the correct plug. some even list AC, Motor craft, Bosch and so on.
what type work best?

now for the hard part Jag says a gap of .035 but others say .025, so what is the correct gap?

also, if you have experience with different plugs let me know what has worked and what has not.

thanks, Dave
 
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Old 08-11-2018, 10:07 AM
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Originally Posted by XJ12Dave View Post
Hey Folks.

I was checking the parts numbers for my 94 V 12 for the correct plugs, Jaguar says the "new" plug number is NAB 3850DA, have not found more than 4 or 5 on any one site.
Not sure where you got that part number from Dave, I just looked it up and came up with EBC4021 as the part number.

Sample google of that part number:
https://www.ebay.com/p/Jaguar-Spark-...JS/1125472555?
 
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Old 08-11-2018, 11:48 AM
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More info for you.

bob
 
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Old 08-11-2018, 02:07 PM
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Larry, Bob, the car runs "OK", just needs a tune up, sat for a while.
the Jaguar part number for the plugs, NAB-3850DA is from the 12-55 tech bulletin

I am looking for spark plugs that are easier to find and not so expensive.
and of course, the correct gap.

thanks, Dave
 
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Old 08-11-2018, 02:27 PM
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Rock Auto lists the correct plug as NGK BR7EF.

I don't know the correct heat range so I cannot advise.

I do remember when we switched from Champion to NGK for the Jaguar V12 engines.
Transit plugs were deleted from service.

bob
 
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Old 08-11-2018, 05:03 PM
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I come up with BR6EF (NGK) RS9YC (Champion) as cross referenced Jaguar part NAB3850DA.

Both come pre-gapped at .035"

NGK or Champion. Pick-your-pick.

bob
 
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Old 08-12-2018, 04:39 AM
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Thanks folks, I will visit local stores today and try to find 12.

Thanks again, this site is fantastic and all of you are a great help.

Dave
 
 
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