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V8 spark plug gap in mm anyone please?
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pagoda
 


Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1923

Canada 2016 LR4 3.0 SDV6 Landmark LE Auto Yulong WhiteLR4
V8 spark plug gap in mm anyone please?

As per the post; I’m changing the plugs on my V8 but have conflicting info on the plug gap. Could anyone offer a definitive answer please? Thanks.
 PAGODA  
Post #19497421st Jun 2018 5:57 am
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pjm-84
 


Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2406

Ukraine 

From the LR workshop manual.

Spark plugs: Make NGK Type 1FR5N10 Iridium
plug Gap 1.0 mm (0.04 in)
Ignition coil: Make Denso Type 2W93-12A366-BA
Firing Order: 1-5-4-2-6-3-7-8
Description Nm lb-ft
Ignition coil bolt 6 4
Spark plugs 25 18
  
Post #19497461st Jun 2018 6:43 am
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Pete K
 


Member Since: 15 Jan 2016
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England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

and if not Iridium it can be bigger. e.g 1.1mm or even more
  
Post #19498021st Jun 2018 11:02 am
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M3DPO
 


Member Since: 22 Sep 2010
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England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

I use an hacksaw blade as a gauge Whistle
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #19498161st Jun 2018 11:52 am
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kajtzu
 


Member Since: 10 Aug 2017
Location: Helsinki
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Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

In case it matters, I used Denso IK16TT plugs instead of NGK. The gap is 1.0 mm on them, too.
  
Post #19498681st Jun 2018 3:40 pm
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pagoda
 


Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
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Canada 2016 LR4 3.0 SDV6 Landmark LE Auto Yulong WhiteLR4

Thanks everyone. I omitted to post that I’m using NGK laser Iridium. So will gap at 1mm.

Cheers.
 PAGODA  
Post #19500081st Jun 2018 11:16 pm
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
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Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

Iridiums should not be adjusted, they come set from factory
  
Post #19500672nd Jun 2018 8:46 am
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pagoda
 


Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1923

Canada 2016 LR4 3.0 SDV6 Landmark LE Auto Yulong WhiteLR4

Globetrotter448 wrote:
Iridiums should not be adjusted, they come set from factory


With respect, this is poor advice in my view. From experience, ‘set from factory’ doesn’t always mean ‘set right.’ It’s always worth checking plug gap BEFORE install rather than assuming all is correct, then finding out you have poor running due to incorrect gap/mis-aligned electrodes having had to remove to check. Checking/setting takes 10 mins for a set of plugs. Way less hassle than having to remove to check after finding a problem.

NGKs website has this under FAQ:

Should I Gap My Plugs?
April 10, 2018
A spark plugs Gap directly affects the tip temperature and the voltage necessary to fire the plug. NGK spark plugs traditionally leave the factory pre-gapped for their most popular application. However, a plug may fit hundreds of engines, from cars to golf carts. Gapping the plugs to your engine’s specifications is important to prevent pre-ignition, detonation, fouling and poor fuel economy. Even if the preset Gap matches that required by your engine, it is always good practice to physically check the Gap as it may have shifted during transportation (not all spark plugs are packaged in a way that protects the firing end ).
 PAGODA  
Post #19501052nd Jun 2018 10:56 am
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RickyAtHere
 


Member Since: 05 May 2018
Location: Alberta
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Canada 2005 LR3 4.4 V8 SE Auto Zambezi SilverLR3

I use Denso IridiumTT on the AJ-V8, MPG increases a bit
  
Post #195264311th Jun 2018 2:22 am
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Dan1720v
 


Member Since: 28 Mar 2018
Location: Street/Somerset
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United Kingdom 2005 Discovery 3 TDV6 SE Manual Aintree GreenDiscovery 3

pagoda wrote:
Globetrotter448 wrote:
Iridiums should not be adjusted, they come set from factory


With respect, this is poor advice in my view. From experience, ‘set from factory’ doesn’t always mean ‘set right.’ It’s always worth checking plug gap BEFORE install rather than assuming all is correct, then finding out you have poor running due to incorrect gap/mis-aligned electrodes having had to remove to check. Checking/setting takes 10 mins for a set of plugs. Way less hassle than having to remove to check after finding a problem.

NGKs website has this under FAQ:

Should I Gap My Plugs?
April 10, 2018
A spark plugs Gap directly affects the tip temperature and the voltage necessary to fire the plug. NGK spark plugs traditionally leave the factory pre-gapped for their most popular application. However, a plug may fit hundreds of engines, from cars to golf carts. Gapping the plugs to your engine’s specifications is important to prevent pre-ignition, detonation, fouling and poor fuel economy. Even if the preset Gap matches that required by your engine, it is always good practice to physically check the Gap as it may have shifted during transportation (not all spark plugs are packaged in a way that protects the firing end ).


True, but if you try and adjust the gap on iridium you’re likely to damage the electrode and therefore shouldn’t adjust them.
  
Post #195264811th Jun 2018 5:40 am
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