Belt Walking - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

scion fr-s · 04-09-2021, 01:16 AM

Hello. I have belt movement. I replaced the two idler pulleys and the accessory pulley. I also replaced the tensioner pulley and brand new OEM belt. I still have belt movement. My next guess is replacing the alternator pulley. What I mean, is my belt walks side to side. Feel free to chime in. Maybe it is time to find a shop. ARG!!! TIA.

Turdinator · 04-09-2021, 01:18 AM

Does it jump a groove in the grooved pullies?

Ultramaroon · 04-09-2021, 02:31 AM

Do you have a supercharger?

scion fr-s · 04-09-2021, 03:52 AM

Forgot to mention that I put on a new belt and noticed the edges were starting to tear from the movement of the belt. I am starting to guess that my pulleys are not balanced, causing the belt to walk. No noticeable belt movement on the grooved pulleys. I notice belt movement on the tensioner pulley and idler pulleys since I have to readjust the belt before starting the car. I need to make a video and I am NA with bolt-ons. This is weird because when I had my FRS, I had no belt issues or movement. Freakin BRZ.

Project_1796 · 04-09-2021, 04:05 AM

Quote:

Originally Posted by scion fr-s

Forgot to mention that I put on a new belt and noticed the edges were starting to tear from the movement of the belt. I am starting to guess that my pulleys are not balanced, causing the belt to walk. No noticeable belt movement on the grooved pulleys. I notice belt movement on the tensioner pulley and idler pulleys since I have to readjust the belt before starting the car. I need to make a video and I am NA with bolt-ons. This is weird because when I had my FRS, I had no belt issues or movement. Freakin BRZ.

Did you check the crankshaft harmonic balancer? is it OEM or aftermarket?

soundman98 · 04-09-2021, 04:06 AM

There's 3 idler pully's, though it sounds like something else is not aligned correctly. Have you tried watching it on startup to see where it's jumping?

scion fr-s · 04-09-2021, 04:29 AM

Quote:

Originally Posted by Project_1796

Did you check the crankshaft harmonic balancer? is it OEM or aftermarket?

I have not and an OEM crank pulley.

scion fr-s · 04-09-2021, 04:29 AM

Quote:

Originally Posted by soundman98

There's 3 idler pully's, though it sounds like something else is not aligned correctly. Have you tried watching it on startup to see where it's jumping?

I called letter G an accessory pulley LOL.

Ashikabi · 04-09-2021, 07:53 AM

Bad bearing somewhere?

Sent from my ONEPLUS A5010 using Tapatalk

Tcoat · 04-09-2021, 07:58 AM

When you say you replaced the pulleys were the new ones stock or aftermarket?
Not sure from your wording but did you have movement before changing the pulleys?

Lantanafrs2 · 04-09-2021, 11:52 AM

Sounds like a pulley isn't seated right

scion fr-s · 04-09-2021, 02:32 PM

Quote:

Originally Posted by Tcoat

When you say you replaced the pulleys were the new ones stock or aftermarket?
Not sure from your wording but did you have movement before changing the pulleys?

The new pulleys were OEM Subaru. The old pulleys showed signs of wear which is why I replaced them and yes I had belt movement before changing the pulleys.

scion fr-s · 04-09-2021, 10:58 PM

Thoughts?

soundman98 · 04-09-2021, 10:59 PM

so it's not jumping teeth side-to-side, but is moving? should be able to see it attempting to move one place more than another.

04-09-2021, 01:16 AM	#1
scion fr-s Senior Member Join Date: Jun 2017 Drives: 2017 PP BRZ Location: California Posts: 236 Thanks: 56 Thanked 57 Times in 46 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Belt Walking Hello. I have belt movement. I replaced the two idler pulleys and the accessory pulley. I also replaced the tensioner pulley and brand new OEM belt. I still have belt movement. My next guess is replacing the alternator pulley. What I mean, is my belt walks side to side. Feel free to chime in. Maybe it is time to find a shop. ARG!!! TIA.

04-09-2021, 02:31 AM	#3
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	Do you have a supercharger? __________________ service manuals

04-09-2021, 04:06 AM	#6
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,675 Times in 6,782 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	There's 3 idler pully's, though it sounds like something else is not aligned correctly. Have you tried watching it on startup to see where it's jumping? __________________ "The time you enjoy wasting is not wasted time"

04-09-2021, 07:58 AM	#10
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	When you say you replaced the pulleys were the new ones stock or aftermarket? Not sure from your wording but did you have movement before changing the pulleys? __________________ Racecar spelled backwards is Racecar, because Racecar.

04-09-2021, 10:58 PM	#13
scion fr-s Senior Member Join Date: Jun 2017 Drives: 2017 PP BRZ Location: California Posts: 236 Thanks: 56 Thanked 57 Times in 46 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Thoughts? Attached Images

04-09-2021, 03:52 AM	#4
scion fr-s Senior Member Join Date: Jun 2017 Drives: 2017 PP BRZ Location: California Posts: 236 Thanks: 56 Thanked 57 Times in 46 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Forgot to mention that I put on a new belt and noticed the edges were starting to tear from the movement of the belt. I am starting to guess that my pulleys are not balanced, causing the belt to walk. No noticeable belt movement on the grooved pulleys. I notice belt movement on the tensioner pulley and idler pulleys since I have to readjust the belt before starting the car. I need to make a video and I am NA with bolt-ons. This is weird because when I had my FRS, I had no belt issues or movement. Freakin BRZ.

04-09-2021, 07:53 AM	#9
Ashikabi Senior Member Join Date: Aug 2014 Drives: 2013 FR-S Location: Northwest Iowa Posts: 7,359 Thanks: 454 Thanked 4,549 Times in 2,950 Posts Mentioned: 59 Post(s) Tagged: 5 Thread(s)	Bad bearing somewhere? Sent from my ONEPLUS A5010 using Tapatalk

04-09-2021, 11:52 AM	#11
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,570 Thanks: 2,579 Thanked 3,132 Times in 1,684 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Sounds like a pulley isn't seated right

04-09-2021, 10:59 PM	#14
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,675 Times in 6,782 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	so it's not jumping teeth side-to-side, but is moving? should be able to see it attempting to move one place more than another. __________________ "The time you enjoy wasting is not wasted time"

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