Adjusting drive belt tension questions - Toyota Yaris Forums

Rob888 · 09-27-2021, 03:02 PM

The deflection and tension specs for a used drive aka serpentine belt for my 2010 Yaris as shown in the Toyota Factory Repair Manual are respectively: 11mm-13mm and 180 ft lbs-289 ft lbs. That seems extremely tight. Are these figures correct?

Is the 90 degree belt tightness test(meaning twisting the belt to the point where it feels like it doesn't want to twist any further) adequate? What are the most reliable belt tension gauges that are reasonably priced? Thanks for any replies.

FunctionSpec · 10-01-2021, 03:03 PM

No idea on the figures being correct but getting the tension right on a Yaris belt is tricky. Best way is to mark the location on the bracket from factory and get within that spec. If it squeaks, tighten it slightly a little more until it goes away. Use OEM Toyota belt only. Aftermarket belts will squeak. OEM belt will squeak too but only occasionally and during cold mornings. Do not over-tighten as it will wear out the water pump bearing prematurely. Watch out for the VVT solenoid, it breaks easily if you accidentally pry on it when adjusting belt tension.

bronsin · 10-01-2021, 03:09 PM

+1

09-27-2021, 03:02 PM	#1
Rob888 Drives: 2010 Yaris 2 door hatchback Join Date: Feb 2019 Location: Costa Mesa, CA Posts: 19	Adjusting drive belt tension questions The deflection and tension specs for a used drive aka serpentine belt for my 2010 Yaris as shown in the Toyota Factory Repair Manual are respectively: 11mm-13mm and 180 ft lbs-289 ft lbs. That seems extremely tight. Are these figures correct? Is the 90 degree belt tightness test(meaning twisting the belt to the point where it feels like it doesn't want to twist any further) adequate? What are the most reliable belt tension gauges that are reasonably priced? Thanks for any replies. Last edited by Rob888; 09-27-2021 at 03:43 PM.

10-01-2021, 03:09 PM	#3
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	+1 __________________ Synthetic Oil: Its All In Your Head

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10-01-2021, 03:03 PM	#2
FunctionSpec Super Newbie View User's Garage Drives: 2007 Yaris Liftback White Join Date: Jul 2007 Location: 626, Southern California Posts: 180	No idea on the figures being correct but getting the tension right on a Yaris belt is tricky. Best way is to mark the location on the bracket from factory and get within that spec. If it squeaks, tighten it slightly a little more until it goes away. Use OEM Toyota belt only. Aftermarket belts will squeak. OEM belt will squeak too but only occasionally and during cold mornings. Do not over-tighten as it will wear out the water pump bearing prematurely. Watch out for the VVT solenoid, it breaks easily if you accidentally pry on it when adjusting belt tension.