Idler Pulley DIY Guide?

[humfrz]

Originally Posted by shellslinger

Man this thread went from asking to help to something awesome @humfrz and @Ultramaroon.

Yep, just a couple of good ol boys .....haven some fun .....


humfrz

[shellslinger]

Originally Posted by humfrz

Yep, just a couple of good ol boys .....haven some fun .....


humfrz

Always a fun and learning experience from both of you LOL

[Ultramaroon]

Originally Posted by shellslinger

Man this thread went from asking to help to something awesome @humfrz and @Ultramaroon.

@humfrz' has lived a pretty awesome life. I'd love to hang out on his porch for an afternoon of lemonade and bullshit.

[humfrz]

Originally Posted by Ultramaroon

@humfrz' has lived a pretty awesome life. I'd love to hang out on his porch for an afternoon of lemonade and bullshit.

Here we are ...... Ultramaroon and humfrz ......


humfrz

[shellslinger]

Originally Posted by Ultramaroon

@humfrz' has lived a pretty awesome life. I'd love to hang out on his porch for an afternoon of lemonade and bullshit.

HAHAHA, perhaps this future Texan from California can join ya'll one day

[humfrz]

Originally Posted by shellslinger

HAHAHA, perhaps this future Texan from California can join ya'll one day

Oh ya, we have room on the porch ....... but you have to bring your own rocking chair ..... ....... and girl ....... (these here two are spoke for....).


humfrz

[shellslinger]

Just wanted to update, I fixed the issue. Idler pulley was bad . But thanks @humfrz and @Ultramaroon for the help

Literally took 20 minutes to replace.

[humfrz]

Originally Posted by shellslinger

Just wanted to update, I fixed the issue. Idler pulley was bad . But thanks @humfrz and @Ultramaroon for the help

Literally took 20 minutes to replace.

Thanks for the update ......glad you got er fixed.....


humfrz

[Ultramaroon]

Originally Posted by shellslinger

Literally took 20 minutes to replace.

Sounds about right. Good on ya!

[C4RBON]

Originally Posted by Ultramaroon

Be super careful cocking that tensioner. Do not use an open end wrench because it will slip. Use a box end or a socket. Note that the tensioner pulley bolt is left handed.

Good luck!

Mine was not left handed. It did, however, have some loctite. I'm guessing this is why the pulley part of the tensioner is not a separate part; you can only order the entire assembly (23769AA040). This assembly may have changed over the years. Mine is from a 2015 BRZ.

And to be clear, the bolt holding the tensioner to the alternator bracket is also not left-handed; that one requires a 8mm male hex bit socket.

[Ultramaroon]

Originally Posted by C4RBON

Mine was not left handed. It did, however, have some loctite. I'm guessing this is why the pulley part of the tensioner is not a separate part; you can only order the entire assembly (23769AA040). This assembly may have changed over the years. Mine is from a 2015 BRZ.

And to be clear, the bolt holding the tensioner to the alternator bracket is also not left-handed; that one requires a 8mm male hex bit socket.

Thanks! I saw that my links were dead so I fixed them. Even the 2017 manual still has the note.

[C4RBON]

Thanks for updating the links.

My car developed a faint whirring noise on Saturday morning before I left for a 5hr road trip for autocross. By the time I got home, it sounded like I have a super-charger. I think I found the culprit this morning, but to be safe I'm replacing all the idler pulleys, tensioner, and belt.

I ordered parts today. My local dealer said that the tensioner assembly (23769AA040) has been superseded by 23769AA111. The pictures in the online parts catalog (parts.subaru.com) show that as a zinc-coated steel part. The one on my engine is definitely aluminum (probably die-cast). I would be curious to see what a 2019 engine comes with from the factory. A friend that works at another Subaru dealer says he can order the original part (23769AA040). Not sure what's going on with these tensioners.

Edit: The link to the service manual shows the tensioner as part of the alternator bracket (they are an assembly, not individual parts). I wonder why there have been so many revisions/changes over the years? I am not aware of the accessory belt being a nuisance on these engines.

[C4RBON]

Update: 23769AA111 is not the correct tensioner. One of the ears/tabs on the base interferes with the alternator bracket, and it won't fit.

[jacjac3]

Originally Posted by C4RBON

Mine was not left handed. It did, however, have some loctite. I'm guessing this is why the pulley part of the tensioner is not a separate part; you can only order the entire assembly (23769AA040). This assembly may have changed over the years. Mine is from a 2015 BRZ.

And to be clear, the bolt holding the tensioner to the alternator bracket is also not left-handed; that one requires a 8mm male hex bit socket.

I ordered 23769AA111 for my 2013 brz.
https://www.subaruparts.com/oem-part...elt-23769aa111
I can't find any instructions on how to replace this part in the service manual.

Can't even find the torque spec on the 8mm hex bolt you mentioned.

Did you end up replacing your tensioner?