120000 Servicing

I would note the @NutzAboutBolts video on spark plug change is one of his longer one, and 90 percent of it involves removal/replacement of periferal items, the wipers, wiper linkage and motor, and the cowl. It is literally nutz about bolts...

In the video they mention 20 foot/pound torque for the plugs. The repair manual says 15, presumably with dry threads. If you were to use anti-seize I would maybe put it on and wipe it off, counting on some to remain in the threads, and reduce torque to 13. That was my ploy, anyway.

Again, aren't the plugs at 120K?

 

Not really- but the cowl needs to come off and the plugs require a 14mm spark plug socket, not a 5/8". Also, Toyota recently revised the plugs and they are a bit hotter than before. Aftermarket catalogs do not reflect this yet.

 

Since my cars don't go back to the dealers for anything but warranty work and recalls I do my own service schedule and most items are
done ahead of their recommendations. Their schedule is like a building code in my opinion, it is a minimum requirement.

 

9/16" spark plug socket works too. I was expecting 5/8" when I pulled ours (just for a look), and was casting about for a bit, assumed it'd be 1/16" less I needed. I see 14 mm is slightly tighter than 9/16".

Regarding the hotter plugs, and info or links?

 

The new plugs are 90919-01275, which cross over to SC16HR11. I believe the prior ones were SC20HR11.

 

Thanks! From my pdf Owner's Manual:

 

I don't think it'd be the end of the world to use what you've got. I've never heard anything from Toyota Canada about revised plug spec. Is there something on the Toyota USA website, did owners get a notice, or just dealership service departments. It'd be nice to see some document on this.

FWIW, I just took a look at our plugs around 50K kms (time on my hands ), and they looked fine, not clogging. Maybe by change time another story, not sure.

 

Just happened on this thread, from some time back, on the (possible) switch to hotter plug. Seems like there's some confusion still?

Gen 3 Prius Spark Plugs superceded with hotter plugs | PriusChat

I think when it's time for me I'll check with my local dealership too, see what they've heard.

If I plug in SC20HR11, first hit for me is Amazon.ca, and it says it's compatible with 2010 Prius, fwiw:

 

This is the best I can offer...

Also, see the attached screenshot.

 

The level of heat range is connected to low or high speed driving. The initial choice for the right heat range is a result of expectations towards average use of the engine. After a few years of experience with this engine, the manufacturer decided to lower the heat range.

I've been assuming the 20 was too cold, fouling too much, and the 16 is a "hotter" plug, tends to heat up faster, accordingly keeps the plug cleaner? By "lower the heat range" does that mean they're acknowledging it's a colder running engine than initially expected, and accordingly requires a hotter plug?

 

That is pretty much what I interpreted as well.

 

Supersessions within the Spark Plug range
30 June 2017 | Article

Supersession of Automotive Iridium Power and Tough plugs to Iridium TT (IrTT). Fast moving SC20HR11 Iridium Spark Plug superseded with SC16HR11

Supersession of Automotive Iridium Power and Tough plugs to Iridium TT (IrTT)

For automotive applications, Iridium TT will supersede a part of the Iridium Power and Iridium Tough range.

After 20 years of 0.4mm patented Iridium we are now moving forward with Iridium TT long life for
automotive applications. Iridium TT utilizes 0.4mm center electrode, with an addition of a needle type ground electrode. This new development is the next step of evolution in Iridium technology and continues the high quality legacy of Iridium Power and Tough.

From June 2017 we will automatically supersede the phased out Iridium Power and Iridium Tough references to the new Iridium TT. You will receive stock of the new IrTT plug if the old stock is depleted. This will ensure delivery of the correct alternative Spark Plug in case you order the old reference.

Below is a Cross Reference overview with applicable part numbers.



Fast moving SC20HR11 Iridium Spark Plug superseded with SC16HR11

Part Number SC20HR11 will be phased out. Due to OE requirements all demand will continue to the existing SC16HR11.

In the past only the 2014 Aygo/108/C1 and Yaris had 16 heat range, however going forward all other engines will move from SC20HR11 to the SC16HR11 Spark Plug. For Aftermarket it is safest to switch gradually to SC16HR11 for the whole connected car parc and sell out the current stock
of SC20HR11. We will supersede SC20HR11 with SC16HR11 automatically in terms of ordering and delivery, following Toyota’s decision. Please refer to the DENSO Spark Plug catalogue for the correct crossing.

Due to OE requirements DENSO has to change the heat range from 20 to 16. These connected applications are mainly Toyota engines. The OE car manufacturer has already switched to SC16HR11 for newly manufactured vehicles. The Aftermarket will follow this consequently.

The level of heat range is connected to low or high speed driving. The initial choice for the right heat range is a result of expectations towards average use of the engine. After a few years of experience with this engine, the manufacturer decided to lower the heat range.

In all digital catalogues like TecDoc and MAM, the change will take effect in June 2017.

From June 2017 onwards we will automatically supersede SC20HR11 with SC16HR11. This will ensure delivery of the correct Spark Plug in case you order the old reference.

Find out more about DENSO's Spark Plugs.

 

The spark plugs THREADS are 14mm, but not the size of the socket used to take them out. That will vary based on the manufacture of the spark plug but is typically 9/16,16mm, or 5/8 (read the spec for spark plug manufacturer before ordering a spark plug wrench). I learned the hard way after spending $$$ and wasted time on a 14mm socket!

 

The spark plugs definitely require a 14mm spark plug socket. I have done multiple sets of these. I assume we are talking about the 10-15 Prius and not the prior generation.

Did you purchase an actual 14mm spark plug socket or did you try to remove the plugs using a thicker 14mm impact socket?


iPhone ? Pro

 

The stock denso plus is 14 mm socket, or 9/16". I've used the latter.

 

Gen 2 is 5/8” socket, the gen 3 is 9/16”.

 

This socket is the one I use:
Snap-on Store