Here is a quick rundown on spark plug replacement on the 4.8 l Engine. Keep in mind I have the GL, which has a normal cable operated throttle, but I'm sure the auto with a fly by wire throttle won't be much different.
6 x very expensive spark plugs NGK PLFR5A-11 or cheapies LFR5A as fitted by Nissan on our Patrols :-( The 11 indicates plug gap of 1.1mm and thus you should not need to gap the plugs.
1 x manifold upper collector gasket - 14033-VC200 , about R60 from your nearest Nissan spares dept.
As with al jap cars, you need a 10mm, 12mm (spanner and socket 3/8 with 12inch extension), plugsocket (small) , flat and star screwdriver, and pliers.
I refer to spanner size not bolt size.
Remove engine tupperware (engine cover) 3 x 10mm bolts + 1 x 10mm nut
Undo and remove intake rubber hose between MAF sensor housing and throttle 1 x 10mm bolt to remove plenum .Put plenum on other side of engine.
Unclip throttle and speed control cables, undo cable bracket 2 x 10mm bolts (I did not even loosen the cables)
The inlet manifold consist of 4 pieces, I chose to split it in the middel between the upper collector and intake manifold collector - see pic.
Unclip vacuum hose in the middel and side of upper collecter part of manifold. Undo electrical connections on throttle part and remove bracket 2 * 12mm bolts ( see pic - intake manifold rear support). I suggest you do not disconenct the pipes at the bottom of throttle, I have a feeling it's water pipes.
Undo 4*12mm bolts and 2 *12mm nuts (Use magnet to withdraw bottom bolts unless you like searching for dropped bolts. Move throttle and upper collecter part to the right.
Unclip Coil electrical connector , undo bolt and remove coils , each kept in place by a 1x 10mm bolt and change plugs.
Refit in reverse, notice upper collecter has a fastening sequence - see pic and please don't drop anything in the manifold or plug holes. Use some anti seeze compound on plug threads.
- Manifold layout
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