@GavinC

Found the specs...they are a little different...Below are the spark plug specs for the P400 from the Service Manual: Section 303-07C Engine Ignition

Downloadable PDF here: https://landroverforums.com/forum/20...0-p400-109129/

Spark Plug Part #: LR178881 (Supersession: LR091617)
Spark Plug Gap: 0.6 - 0.65mm
Spark Plug Torque: 23 Nm (17 lb-ft)
Ignition Coil Bolts Torque: 8 Nm (5.9 lb-ft)

 

Thanks again

Yeah I was able to get the specs from the manual. I have it downloaded some years back. Useful to have for sure. The gap spec is in there. I have a gapping tool and gauge so shouldn't be too much of a hassle. We'll see.

 

An update on GAP setting for the inline 6 P400 Ingenium.

The plugs are Iridium centered and supposedly come with the correct gap setting. Being Iridium, they apparently should not be gapped, but can have their gap verified to be correct. This was news to me. Last spark plugs I did were on a 1982 Datsun Bluebird so I'm not exactly clued in.

All 6 of were verified to be gapped correctly.



Changing the plugs involves among other things.

• Removing the low pressure air duct from the top.
• Removing a center bulkhead panel between engine and firewall
• Moving aside some air suspension hoses
• Removing the cross-member above the engine (11 M8 bolts)
• Putting the air distribution doohickey into service mode. (removing oodles of bolts and connectors to do this)
• Lifting the hood all the way up, removing the struts to allow this.

Should be quite the adventure. 4 beer task minimum

I'd love to know what a dealership would charge for this service item. Probably not as complicated as it sounds in the manual. I guess the I6 just runs out of room for a simple change of plugs.

 

@GavinC - And THAT is why I'm now glad my Defender sits on the east coast closer to Sarek... I've been much more open to having someone else do some service work for me as I get older! But, as mentioned - it ultimately depends on the cost.

 

You've left the warm embrace of Texas' sage in bloom and wide and high prairie sky for the East coast? Sorry for your loss.

 

As tasks go, this is as simple as you’d like

I am glad to have done this change earlier than the 63000 prescribed mileage

very dark thick diff oil





Sludgy black diff oil







This is the fill plug



Metal shavings are minimal.



Gap tool and Trax get you plenty of room to work





Next up is the transfer case.

 

51,700 miles


Scheduled maintenance has this due at 63,000 miles.

• Lift the front end and chock the rear wheels
• Pop off the undershield
• Partially remove the left underfelt
• Remove Fill plug
• Remove Drain Plug
• Drain transfer case
• Replace crush washer and tighten drain plug to 28Nm (21 ft lb)
• Fill transfer case with correct fluid. I used OEM
• Replace crush washer and tighten fill plug to 28Nm (21 ft lb)
• Reinstall felt
• Reinstall undershield.

OEM fluid. Incorrect size crush washers from Landleaping.com Reused the old ones, much to my chagrin.



Hex socket on drain and fill plugs

Transfer case

Lift and jack stands as a fail safe.

A new beverage for a new task.


Optional. Spend an hour struggling with the undershield bolts like a moron. Hacksaw off a stripped bolt and add sailor-talk to taste

Crack a cold one
Test drive.
Bourbon.

 

@GavinC
Nice job, how did the oil look ?

 

• Fill transfer case with correct fluid. I used OEM

How much oil was needed. l assume you didn't replace the oil in the gearbox as that's not an easy task!

 

I didn't measure exactly. I just filled it till it reached the fill hole. Volume used was comparable to the capacity in the manual (1.25L) plus a little spillage.

I didn't do the transmission fluid yet. I'm probably still a bit early mileage to be doing that one. I'd have to check the manual for the scheduled miles but I think it may be at the 105k service. I'll not go that long.

Spark plugs next.