Toyota Yaris Forums - Ultimate Yaris Enthusiast Site


Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Thread Tools Display Modes
Old 11-02-2016, 02:25 PM   #19
bronsin's Avatar
Drives: 2009 Base Hatch 2 Dr Auto
Join Date: Dec 2008
Location: nj
Posts: 4,712
I'm thinking if ANY of the bolts aren't reusable They didn't use the right grade of metal in them in the first place.

That would also suggest the first use of the bolts might result in failure.
Synthetic Oil: Its All In Your Head
bronsin is offline   Reply With Quote
Old 11-02-2016, 02:28 PM   #20
bronsin's Avatar
Drives: 2009 Base Hatch 2 Dr Auto
Join Date: Dec 2008
Location: nj
Posts: 4,712
Originally Posted by Jason@SportsCar View Post
The Yaris head bolts get replaced after use.
That I've heard of.

I can't explain it but that would only MAKE ME REUSE THEM!
Synthetic Oil: Its All In Your Head
bronsin is offline   Reply With Quote
Old 11-02-2016, 03:45 PM   #21
Drives: 2007 Yaris Sedan
Join Date: Oct 2016
Location: Merced, CA
Posts: 9
Originally Posted by CrankyOldMan View Post
I took a look at the OEM Yaris repair manual and it seems that truth is stranger than fiction! The A/T flex plate CAN reuse the bolts, but the M/T flywheel CAN'T. Even stranger than that, is that the xD repair manual (not pictured) only shows the M/T bolts as "precoated", and not "non-reusable", but also has a post-torque turn requirement.

It seems that the difference, then, is in how the joint is engineered. The flywheel experiences significantly higher shear loads and is safety critical, so it needs a tighter joint, and it was engineered with Torque Turn to Tighten (TTT) joints. The flexplate has a lot of "slush" factor from the torque converter, so it can rely on standard torque to friction joints. (I read an article on it, for reference:

In this case, I would specifically follow the OEM procedure and replace them for a M/T vehicle, instead of following "shop lore" about if you can or can't, based on other vehicles' requirements.
I'm following the TIS 6.6A for the 2007 yaris. Step be of installing the flywheel is:

"(b) Clean the 6 bolts and their holes."

So it appears you really can re-use them which is why the dealers don't stock them.

That said, I did end up getting 6 new ones this morning and used those. They came with thread lock on them already. If the shop manual didn't intend for you to re-use them they woudn't tell you to clean them and apply red thread lock which it does.

That said, there length difference was 29.29 (new) vs 29.80 (old) which is a pretty big difference.
sorka is offline   Reply With Quote
Old 09-18-2021, 05:24 PM   #22
Drives: 2009 1.5 Hatchback Manual
Join Date: Sep 2021
Location: Southeast
Posts: 10
Hello are the flywheel bolts spline or 12 point bolts? Thank you
crumbs is offline   Reply With Quote
Old 02-21-2023, 12:39 PM   #23
I've made a post!
Drives: 2007 Toyota Yaris Sedan
Join Date: Feb 2023
Location: Ohio
Posts: 1
Sorry to revive a multi-year old thread but I just completed an engine swap on an '07 Yaris Sedan A/T and am finding all kinds of conflicting info on these flywheel torque specs. Below is the supposed Toyota FSRM and it states the "6 torque converter set bolts" should be torqued to 20ft/lbf (page 176 of the "U340E Automatic Transaxle" chapter). It mentions nothing about torque, wait XX minutes and retorque. Nothing about using Loctite. Nothing about torque then additional XX degrees of rotation. Nothing about replacing the 6 bolts. Can anyone shed any additional light on this?

Last edited by shane21; 02-21-2023 at 01:09 PM.
shane21 is offline   Reply With Quote
Old 03-06-2023, 08:56 PM   #24
Drives: 2009 yaris
Join Date: Feb 2016
Location: poughkeepsie ny
Posts: 28
I'd use fixodent....and forget it!

LOL... I'd use loctite and overtorque a bit and never worry about it again. My oldschool mechanic always said torque specs are bs ... I don't think they are all the time, but for torque converter I'd go tighter. You don't want them to loosen like they did on Dodge caravans over 20 years ago and rattle grind against the bell housing.
mirageman is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Questions for new flywheel and clutch mrbond Performance Modifications 11 07-11-2013 07:17 AM
Flywheel question-1nz conversion-2003 Model Echo56 DIY / Maintenance / Service 0 05-21-2013 10:42 PM

All times are GMT -4. The time now is 02:42 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.