follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
Speed By Design
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum - FT86CLUB > Technical Topics > DIY (Do-It-Yourself) Guides

DIY (Do-It-Yourself) Guides For all DIYs.


User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-09-2021, 05:37 AM   #1
Biggumzzz
Member
 
Join Date: Oct 2020
Drives: Toyota 86 2014 GTS
Location: Australia
Posts: 35
Thanks: 3
Thanked 8 Times in 6 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Automatic transmission fluid change questions

Why do we need to get it to a certain temp to do fluid leveling? Id just start the car and get under and fill until it leaks out of the overflow? Still learning. Cheers
Biggumzzz is offline   Reply With Quote
Old 09-09-2021, 05:17 PM   #2
pope
has a funny hat
 
Join Date: Feb 2020
Drives: 2014 BRZ Limited
Location: MI
Posts: 248
Thanks: 242
Thanked 257 Times in 126 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Because fluid expands as its temperature increases.
pope is offline   Reply With Quote
Old 09-09-2021, 10:22 PM   #3
Biggumzzz
Member
 
Join Date: Oct 2020
Drives: Toyota 86 2014 GTS
Location: Australia
Posts: 35
Thanks: 3
Thanked 8 Times in 6 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by pope View Post
Because fluid expands as its temperature increases.
Yeah but why does Toyota say between like 40 and 50 celsius to do it? Tedious process

Wouldn’t you want the temps to be higher than that?
Biggumzzz is offline   Reply With Quote
Old 09-09-2021, 11:24 PM   #4
86TOYO2k17
Senior Member
 
Join Date: Jan 2018
Drives: 2017 toyota 86
Location: PNW
Posts: 1,962
Thanks: 238
Thanked 1,051 Times in 701 Posts
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Biggumzzz View Post
Yeah but why does Toyota say between like 40 and 50 celsius to do it? Tedious process

Wouldnt you want the temps to be higher than that?
Incredibly easy with a scangauge to read exact temp.

Probably they deemed that the highest safe temperature to not risk getting burned. also if doing it from cold its way quicker vs having to let it warm up to a higher temperature while idling.
86TOYO2k17 is offline   Reply With Quote
Old 09-14-2021, 07:50 AM   #5
dodj
Senior Member
 
Join Date: Jul 2013
Drives: Rallye Blue BRZ
Location: Canada
Posts: 107
Thanks: 67
Thanked 51 Times in 30 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Biggumzzz View Post
Why do we need to get it to a certain temp to do fluid leveling? Id just start the car and get under and fill until it leaks out of the overflow? Still learning. Cheers
No idea. If it was simply expansion of the oil, it would have been simple to alter the overflow tube to a suitable cold fluid height. The oil is going to expand the same % every time.
dodj is offline   Reply With Quote
Old 09-14-2021, 09:53 AM   #6
Yoshoobaroo
Seor Member
 
Yoshoobaroo's Avatar
 
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 2,863
Thanks: 1,634
Thanked 2,693 Times in 1,336 Posts
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Garage
Quote:
Originally Posted by dodj View Post
No idea. If it was simply expansion of the oil, it would have been simple to alter the overflow tube to a suitable cold fluid height. The oil is going to expand the same % every time.

Could it be that it really is that simple but that they dont want a leaky fill plug to drain the fluid below whats nominally needed?
Yoshoobaroo is offline   Reply With Quote
Old 09-14-2021, 09:25 PM   #7
86TOYO2k17
Senior Member
 
Join Date: Jan 2018
Drives: 2017 toyota 86
Location: PNW
Posts: 1,962
Thanks: 238
Thanked 1,051 Times in 701 Posts
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
It’s not that complicated.

They specify a temp because of fluid expansion.

They chose 109-117 because this is still hot enough to allow almost anyone regardless of outside temp the ability to do this procedure, especially since you need the engine to be running and cycle gears to make sure fluid is all picked up. So this temp buys you a little time. It is also the hottest temp they probably deemed reasonably safe as you wouldn’t want much hotter than 120f to be dripping onto you. Also since you will be warming up the trans if it was say 170F that would take forever to get to idling already takes long enough driving. So really on all accounts 109-117 makes the most logical and practical sense.
86TOYO2k17 is offline   Reply With Quote
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
DIY: Automatic Transmission Fluid Change Tristor DIY (Do-It-Yourself) Guides 28 09-05-2021 11:09 PM
Automatic Transmission Fluid Change? kev0 Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) 9 02-07-2019 11:18 PM
Automatic Transmission Fluid Change jmaryt Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) 169 08-26-2018 07:55 PM
AUTOMATIC transmission fluid change DIY?? qijian DIY (Do-It-Yourself) Guides 3 08-31-2017 08:34 AM
AUTOMATIC TRANSMISSION FLUID? How many L ScionFR-S Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) 5 02-21-2015 12:43 AM


All times are GMT -4. The time now is 09:25 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.