Underdrive Pulley Belt - Toyota Yaris Forums

ruimond · 02-13-2009, 09:13 AM

Im fairly new to knowing what certain parts of my car are. So just a quick question to those who have the NST Underdrive Pulley. I've had my Underdrive pulley for 2 months maybe, and whenever i start up my car...i think its my belt that sounds a little loose. It does not however sqweel or anything. The car drives fine and there is no worrying sounds to be heard when accelerating.

The question is im looking at getting a shorter belt sometime so i don't have to have it at almost the max tensioner setting. For those who have a shorter belt, what is the belt called? and what length did you buy?

Thanks in advance

cali yaris · 02-13-2009, 11:21 AM

There shouldn't be any need for a shorter belt with that pulley. Have you re-tensioned it? I have a few thousand miles on mine with no problems, but I did re-tension it once.

mikenacarato · 02-13-2009, 11:43 AM

+1, i didnt have to get a new belt either. still had plenty of adjustment left.

NonStopTuning · 02-13-2009, 02:42 PM

Copy and paste of our PMs...

Quote:

Hi Mike,

Was wondering if you were able to answer a question for me.

I got my Underdrive Crank Pulley installed by my mechanic about a month or more ago now. But recently when i start up my car it sounds abit loose i think, well that or the engine has always been abit noisey anyway.

Just a general question, whats the belt called that drives the crank pulley? I need to get a shorter belt as mine is actually on the max tensioner setting. And was wondering if you knew what length was the best for the belt that drives that part. Im looking at buying a new shorter one.

Cheers

Hi Ruimond,

You should not need a shorter belt. The OEM belt works well with the Underdrive Pulley we offer.

However, belts are normal wear and tear items and they do wear out and stretch over time. You may be due for a belt change if yours has outlived the life expectancy.

Try a local auto parts store and buy the highest quality "crank pulley/ accessory belt" you can find for your car.

Good luck!

ruimond · 02-13-2009, 08:28 PM

Thanks for the replies. I'll look at getting it re-tensioned first. The mechanic that put it on, im not sure if he re-tensioned it, i know he just adjusted the belt setting to almost the end because the underdrive is smaller so it had more slack in the belt.

Does re-tensioning require you to do something else?

Not sure if im due to change my belt as Mike said, i've only got about 33,000+km's on my car. But i'll get that looked into as well.

cali yaris · 02-13-2009, 08:58 PM

there's a special tool, looks like a giant screwdriver that you use to adjust belt tension.

ruimond · 02-13-2009, 10:10 PM

Quote:

Originally Posted by cali yaris

there's a special tool, looks like a giant screwdriver that you use to adjust belt tension.

Ok thanks cali :D I will see if i can get someone to tighten the belt with that.

CtrlAltDefeat · 02-14-2009, 06:49 AM

hmmm very strange I installed my underdrive pulley my self and only ad to adjust the alternator about an inch with plenty of room for further adjustment.... you can see pictures of it here:
http://www.yarisworld.com/forums/showthread.php?t=13270

CtrlAltDefeat · 02-14-2009, 06:53 AM

whoops i forgot to take a pic of it after the adjustment err well if you want me to I can take a pic tomorrow to show the difference...

ruimond · 02-14-2009, 07:06 AM

Quote:

Originally Posted by CtrlAltDefeat

hmmm very strange I installed my underdrive pulley my self and only ad to adjust the alternator about an inch with plenty of room for further adjustment.... you can see pictures of it here:
http://www.yarisworld.com/forums/showthread.php?t=13270

Really? Mine was adjusted almost to the maximum. Maybe yours came with a shorter belt to begin with. Haha.

CtrlAltDefeat · 02-14-2009, 07:35 AM

Quote:

Originally Posted by ruimond

Really? Mine was adjusted almost to the maximum. Maybe yours came with a shorter belt to begin with. Haha.

err possibly I guess... regional differences maybe...

jonismyname · 02-14-2009, 09:05 AM

factory belt is 25-040465 gates number.
040=4ribs, 465=47" length.

25040460 46 5/8
25040450 45 3/4
napa #'s, around $23 ea.

there's no reason you can't go shorter if you're unhappy with your current adjustment possibilites.

02-13-2009, 09:13 AM	#1
ruimond Drives: Yaris YR Join Date: Oct 2008 Location: Perth, Australia Posts: 515	Underdrive Pulley Belt Im fairly new to knowing what certain parts of my car are. So just a quick question to those who have the NST Underdrive Pulley. I've had my Underdrive pulley for 2 months maybe, and whenever i start up my car...i think its my belt that sounds a little loose. It does not however sqweel or anything. The car drives fine and there is no worrying sounds to be heard when accelerating. The question is im looking at getting a shorter belt sometime so i don't have to have it at almost the max tensioner setting. For those who have a shorter belt, what is the belt called? and what length did you buy? Thanks in advance __________________ Mods: 17x7 ANZ Tazer Wheels with 215/40/17 Marangoni Tyres \| AFE Air Intake System \| NST Short Shifter Kit \| NST Shifter Cable Bushing Kit \| NST 10% Underdrive Crank Pulley \| Pedders Sports Springs \| Custom 2inch Cat-Back Walker Muffler with 2.5inch Xforce Twin Stainless Steel Tip \| RS Side Skirts \| RS Euro Spoiler \| YRX Front Lip Spoiler \| TRD Style Front Grill \| 12mm Rear Hub Spacers \| Ultra Racing 23mm Rear Sway Bar

02-13-2009, 11:21 AM	#2
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	There shouldn't be any need for a shorter belt with that pulley. Have you re-tensioned it? I have a few thousand miles on mine with no problems, but I did re-tension it once. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

02-13-2009, 08:28 PM	#5
ruimond Drives: Yaris YR Join Date: Oct 2008 Location: Perth, Australia Posts: 515	Thanks for the replies. I'll look at getting it re-tensioned first. The mechanic that put it on, im not sure if he re-tensioned it, i know he just adjusted the belt setting to almost the end because the underdrive is smaller so it had more slack in the belt. Does re-tensioning require you to do something else? Not sure if im due to change my belt as Mike said, i've only got about 33,000+km's on my car. But i'll get that looked into as well. __________________ Mods: 17x7 ANZ Tazer Wheels with 215/40/17 Marangoni Tyres \| AFE Air Intake System \| NST Short Shifter Kit \| NST Shifter Cable Bushing Kit \| NST 10% Underdrive Crank Pulley \| Pedders Sports Springs \| Custom 2inch Cat-Back Walker Muffler with 2.5inch Xforce Twin Stainless Steel Tip \| RS Side Skirts \| RS Euro Spoiler \| YRX Front Lip Spoiler \| TRD Style Front Grill \| 12mm Rear Hub Spacers \| Ultra Racing 23mm Rear Sway Bar

02-13-2009, 08:58 PM	#6
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	there's a special tool, looks like a giant screwdriver that you use to adjust belt tension. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

02-14-2009, 06:49 AM	#8
CtrlAltDefeat I ♥ Yaris View User's Garage Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008 Location: Indianapolis IN Posts: 1,313	hmmm very strange I installed my underdrive pulley my self and only ad to adjust the alternator about an inch with plenty of room for further adjustment.... you can see pictures of it here: http://www.yarisworld.com/forums/showthread.php?t=13270 __________________ The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell

02-13-2009, 11:43 AM	#3
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	+1, i didnt have to get a new belt either. still had plenty of adjustment left.

02-14-2009, 06:53 AM	#9
CtrlAltDefeat I ♥ Yaris View User's Garage Drives: Black 08 LB MT & red 97 Miata Join Date: Oct 2008 Location: Indianapolis IN Posts: 1,313	whoops i forgot to take a pic of it after the adjustment err well if you want me to I can take a pic tomorrow to show the difference... __________________ The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. - Bertrand Russell

02-14-2009, 09:05 AM	#12
jonismyname Drives: 08 liftback 5spd Join Date: Oct 2008 Location: adirondacks, ny Posts: 220	factory belt is 25-040465 gates number. 040=4ribs, 465=47" length. 25040460 46 5/8 25040450 45 3/4 napa #'s, around $23 ea. there's no reason you can't go shorter if you're unhappy with your current adjustment possibilites.

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