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R34: Replacing Spark Plugs On Neo6 (rb20de, Rb25de)

Kirill

By Kirill,
in Tutorials / DIY / FAQ

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Kirill Rookie

Kirill

Posted
Posted

Here's translation from Russian of the article originally written by A.V. Perunov from www.auto.vl.ru Original address of the Russian version is http://enc.auto.vl.ru/6421/

To replace old spare plugs on Neo series Engines (RB20DE or RB25DE or similar that were installed on R34 Skylines and some other vehicles (Stagea, Laurel) you will need: wrenches, screwdrivers, pliers plus a hex-nut wrench.

First of all, you should remove the plastic cover that carries Neo6 label and see the following:

25484.jpg

LARGER PICTURE IS HERE

Now, the part noted as "1" in the circle - is our aim - that cover hides coils and spark plugs.

Firstly remove nipple 1 by disconnecting clips on both sides of it with pliers.

Then disconnect nipples 2 and 3 at the sides indicated by arrows. Important note here - the engine should be cool as these nipples are part of cooling system and if you disconnect them on a warm engine, some amount of cooling fluid may spill. It's better to open the radiator cap before disconnecting the nipples too to alter the pressure.

Disconnect connectors marked 4 (you may want to remember them by colors, however, it's rather difficult to confuse them).

Disconnect clamp 5 and onscrew bolt 6 - now you can move airduct apart in the direction of green arrow.

Diconnect nipples 7 and 8 and two nipples marked 9 - remember that one of them that is closer to firewall has a clamp.

Disconnect two sockets marked 10. Thay are different colors.

Now, disconnect two more sockets marked 11 on the following two pictures (note that firewall is on the left side of those pictures:

25474.jpg25476.jpg

Be careful not to brake them - they should be disconnected in the directions marked by arrows. There is no need to remove the metal part that holds the sockeit in place - it will be later removed together with cover. The sign "!" indicates the place where the wire should be disconnected from the cover.

Unscrew 6 bolts holding the intake manifold in place (marked 12 on the first picture). Remove manifold carefully in order not to damage the gasket.

25478.jpg

Put the manifold to the left side. Now it's time to remove the cover. Here you will need a hex-wrench. After unscrewing all bolts holding the cover, move it towards the firewall a bit and then take out.

25488.jpg

After that, you should see something like this - we're almost there =)

25480.jpg

Unscrew bolts holding coils in their places, disconnect coils from the wire and - here we are - time to use the spark-plug wrench =)

After changing plugs check coils as described here http://www.skylineowners.com/forum/showthread.php?t=43555 and assemble everything back.

The whole procedure takes about one hour and a half or so.

P.S. Me personally didn't do this yet, going to try on Sunday - perhaps after that there will be some minor changes from my own.

P.P.S. My technical English is not very good - if you have some corrections regarding the terms - please tell me.

P.P.P.S. Neither me nor original author bears any responsibility for any concequencies of following the proceduredescribed above. This is for informational purposes only. Whatever you do, do it at your own risk.

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  • 1 year later...
Blue_J Enthusiast

Blue_J

Posted
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Was wondering why pics didn't looking anything like my engine bay! Title refers to N/A as opposed to 25GTT :D

There is a great tute around for changing coil packs on a GTT;

http://www.skylinesaustralia.com/forums/Di...tml&hl=coil

Pretty much exactly the same steps reqd for changing the plugs - bit of compressed air in a can was handy to blast away the dust/gunk/crap before putting new plugs in. Don't overtighten the plugs and it's pretty straightforward. I used copper plugs gapped to .8mm and solved all my missing when coming on boost issues.

One tip - which sounds a bit odd, but may help someone - before taking off the coil pack cover take off the oil cap. Otherwise it is super tight to get the cover out.

Hope this helps.

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  • 1 year later...
Les00x Collaborator

Les00x

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Posted (edited)

An accurate guide to replacing R34 Skyline spark plugs.

Will take 1.5 - 2 hours.

No need to have a spare Intake Manifold Gasket - is metalized and sealer not used, so it comes away cleanly.

Overall level of job difficulty - low.

I found it easier to completely remove the Intake Manifold. Will need to remove the Strut Brace to achieve this.

_____________________________

Edited by Les00x
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  • 4 months later...
V28VX37 Veteran

V28VX37

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nb: stock RB 25 DET NEO uses BCPR6ES - 11 (1.1mm gap)

I've got the same but have been recommended to gap them down to 0.8 mm on stock engine and boost (R34 GTT) as I still have the original coil packs that are getting a bit tired.

I've also been told not to bother with platinums (had NGK PFR6A-11's on the car previously) but just keep using copper ones correctly gapped.

More spark plug discussion here

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  • 11 months later...
redlined_az Apprentice

redlined_az

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Posted

Just to put it out there the spark plug gap for my nissan r34 rb25det neo says it should be 1.05 mm. This according to the service sticker on my airbox. =S

I haven't started yet, but i'am going to change my spark plugs soon and will inform you if mine are in fact 1.05mm.

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Jonno34 Mentor

Jonno34

Posted
Posted

great post mate, wish i saw this before i was charged 450 for a set of 2nd hand coils and copper sparkies + labour :(

3 different mechanics in perth told me changing spark plugs on 34's was a big job so i let them do the work

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  • 11 months later...
lkp Rookie

lkp

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Posted

Thank you. Great tutorial - saved me a lot of time and money. I actually only replaced my coil packs as I knew they were at fault. Took just over 1.5 hours from start to finish.

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