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Changing spark plugs on a 2015 Subaru Crosstrek #5317924 01/09/20 04:52 PM
Joined: Oct 2014
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Jeep_Riot Offline OP
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Joined: Oct 2014
Posts: 7
Greetings,

Seems like it’s a ridiculously tight fit between the fender chassis and plug location, especially the rear driver’s side. I’ll be replacing the plugs with OEM NGK. I have a combination of different sockets and extensions, but I doubt I can get my torque wrench in there.

Am I good with hand-tight and then 1/2 a turn? The spark plugs are 14mm, if that helps. I’m assuming I’m working with aluminum, correct?

Thanks!

Just realized I posted in wrong forum. Mods, please move me to Mechanical, please. Thanks.

Last edited by Jeep_Riot; 01/09/20 04:56 PM.
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5317945 01/09/20 05:20 PM
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NissanMaxima Offline
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I just went through similar considerations of torque wrench vs. just tightening a portion of a revolution when I put new NGK plugs in my Maxima. NGK considers their specified amount of revolution past hand-tight an acceptable method of installing plugs. You can look up what they specify on their site. It is always a range and does vary depending on aluminum or not.


1995 Nissan Maxima SE 5 speed
2015 Toyota Corolla S+
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5317946 01/09/20 05:20 PM
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skyactiv Offline
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I owned a WRX and put spark plugs in it once. Yes, your working with aluminum.
The spark plugs have a long thread length, so you'd have to be a dumb Bubba to over tighten and strip the threads. Make sure the engine is cold when you do it. I tightened the spark plugs by feel.
Anyone who's competent can do this by feel. Make sure you keep the ratchet squared while using it.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5317949 01/09/20 05:23 PM
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FA_WRX Offline
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Not sure if the engine bay layout is the same as on a WRX. I removed the battery on the drivers side for plug access. Also unbolted and set to the side ECU box on the passenger side.

Access is tight I used a few extensions and universal joint with plug socket and 3/8 ratchet. I just snugged hand tight no torque wrench.


2015 WRX FA20F
PP Euro L 5W30
WIX 10078

Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5317984 01/09/20 05:51 PM
Joined: Sep 2007
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JMJNet Online Content
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Joined: Sep 2007
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Practice tightening by feeling on the front side first before doing the rear side?

I usually just snug by hand using socket wrench and tap it 2x lightly.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318015 01/09/20 06:20 PM
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14Accent Offline
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45 minute job, if you know the tricks. Definitely take the battery out, and the air intake tube.

My way of doing it is a little fiddly, but it works. I insert the spark plug socket bare, THEN slide the shortest 3/8 extension I can find in after it and get everything attached. Then loosen the plug. When it's free, use a small screwdriver or the like to stick down the spark plug hole and pop the socket free. Remove the extension, and use a flexible magnet to retrieve the socket and plug.

Works for me every time.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2007 Chevrolet Impala LT
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318030 01/09/20 06:29 PM
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Skippy722 Offline
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Baby hands!

NGK says 1/2 to 2/3rds of a turn for gasketed plugs.

https://www.ngk.com/learning-center/article/522/plug-torque-settings

[Linked Image from gifimage.net]


2016 Chrysler 300S v6
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318083 01/09/20 07:06 PM
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SVTCobra Offline
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Just changed the plugs not too long ago on a 16 Crosstrek. Should be able to torque them down if you have the right set of extensions and maybe a wobbly or universal joint. It did take some time I do recall and as 14Accent said some disassembly is required.


Think twice, speak once.
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318205 01/09/20 09:09 PM
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thescreensavers Offline
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This https://www.harborfreight.com/3-piece-square-drive-socket-caps-67011.html helped a crap for my on my 13 GR hatch.

Ujoint worked great to remove em quickly installing them was a little time consuming.


2017 Camaro SS 1LE (Motul 8100 X-clean 5W40)
1997 Jeep XJ 4x4 (15W40 HDEO Maxlife)
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: thescreensavers] #5318239 01/09/20 09:40 PM
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4WD Offline
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Just finished the Fusion Hybrid for the first time …
removing/installing the plastic was harder than coils & plugs … LoL

Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318284 01/09/20 10:53 PM
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Donald Online Content
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Mechanic told me plugs are a real bear on Forester. Cannot imagine them any better on Crosstrek.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Donald] #5318320 01/09/20 11:59 PM
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StarCaller Offline
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Originally Posted by Donald
Mechanic told me plugs are a real bear on Forester. Cannot imagine them any better on Crosstrek.

can confirm that /
that's why I put iridiums in my wife's car so I'm hopefully set for the next years /

Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318440 01/10/20 07:14 AM
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SubieRubyRoo Offline
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I have a couple older EJs and service a few more. I take out the whole intake tube and airbox on the passenger side, and on a couple models I pull the windshield washer tank to get the rear plug on the drivers side. It takes only about 5-8 extra minutes to pull the stuff off the fenderwells, but saves you 25-30 and a whole bunch of cuss words and scrapes trying to wrestle it with everything in place. I assume the newer ones still maintain bolt sizes, so a 10 & 12mm socket should allow you to disassemble everything for this job, or even about 80% of the entire vehicle. LOL

All I ever need to do these plugs is the ratchet, a single straight 6" extension, and a 5/8" spark plug socket with the rubber. 3/8" torque wrench has plenty of room as well for access.

Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318480 01/10/20 08:20 AM
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ARCOgraphite Offline
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I supposedly have to do the plugs on my wife's car, but I'm going to leave them for another 30K.

They are ruthenium-iridium alloy with the fingernail GND electrode.

Should be good for 100K easy. So they stay in. Subaru of America should should be prosecuted for a shakedown on this 60Kmi plug replacement scam!

There are a couple of good videos on youtube on doing this job


This guy used autolites - they looked fine, and he said he noticed no loss in performance or fuel mileage
and they are 1/2 to 1/3rd the cost of the ripoff NGK.

https://www.youtube.com/watch?v=5L1gSGqYQ6E


Subaru has traditionally used Denso or Champion - not NGK. When the dealer used NGK on a tuneup on one of my wifes older subaru, the car ran poor - I had to pull them and put in the proper K20 PRU-11 Nippon Denso and then it ran great again. Not a NGK fan, had FAILS on most everything that used them or that I "downgraded" to NGK aver many decades.

-Ken

Last edited by ARCOgraphite; 01/10/20 08:50 AM.

2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: Changing spark plugs on a 2015 Subaru Crosstrek [Re: Jeep_Riot] #5318504 01/10/20 08:52 AM
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ARCOgraphite Offline
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another video with a guy using NGK

https://www.youtube.com/watch?v=DuAv2ZcjN-I


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
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