I have a 2007 Infiniti g35x. 3 days ago my belt snapped. I replaced it, but after replacing it, it snapped again. I have changed it twice and it snaps it. I noticed it smelled like burnt rubber and I also noticed the cooling fan pulley was a little stuck and there was a little

burnt rubber on it. What do you guys recommend? I want to try everything in my power before giving up and calling a mechanic. Any feedback is very much appreciated, thank you.

 

Spin all the pulleys by hand and verify they turn freely. If there is a seized bearing it's just going to smoke the belt.

The HR engine uses dual electric fans, you don't have a cooling fan pulley.

You are tensioning the belts properly with a tensioner gauge yes? Something like a Gates 91107 and Gates 91132 will have good range for these cars, I think the big belt is 200 lbs and the AC belt is 125 lbs for NEW belts. Check the FSM to verify though.

 

Tensioner tool? I used a serpentine belt tool I bought. There's 2 belts? Auto parts store gave me 1 big one. I don't remember the car having 2 belts

 

Sorry I totally forgot the HR used a single serpentine and a self-adjusting tensioner. Disregard all that stuff about the tensioning.

You still need to spin each pulley by hand and see if any of them have any significant drag.

 

I think I found the culprit. The idle pulley is jammed and has burnt belt on it. Can I remove that pulley completely? Or would it have to be replaced?

 

Those are common off-the-shelf items at most parts houses. The bearing probably blew/overheated/froze up.

I'm not familliar with that exact one but there's usually just a single bolt in the middle that you rattle loose, someone else might be able to help you out with the torque specifications if they know if off-hand, else you can check the FSM.

https://www.nicoclub.com/infiniti-service-manuals

Should be somewhere under EM - Engine Mechanical.

EDIT: EM page 24, 21 ft/lbs.

 

Rockauto lists ~12 idler pulleys for an '07 G35. Looks like 8 of 'em are good name brands like Dayco, Continental, AC Delco, etc (ranging from $25 to $55). Having that many choices suggests to me that Nissan is using a fairly generic idler pulley so getting one locally shouldn't be an issue at all.

They typically aren't too complicated to replace. Getting good access / clearance / room will be the worst part, I'm guessing.

 

I would stay away from Continental right now for their pulleys, belts, and hoses. Their entire catalog seems f'ed up and not sure why. They seem to have taken over the Goodyear Gatorback brands and parts.

I ordered a set of hoses and an idler pulley with belts for an NA Miata, a very simple engine. Went all Continental. Only half of it was usable. Hoses were all the wrong IDs and the idler pulley was for a Buick 3.8 which they claimed it should also fit a 1.8 Mazda (it wasn't even close).

 

Well I changed idler pulley,& changed the belt. Went for a drive, now the belt is shredding?? Any clues why? Thanks

 

Is something out of alignment? Did you reinstall something that uses a pulley without the shins or with washers it didn’t have before? Are you sure the belt isn’t interfering with something? Does your AC clutch cycle on and maybe resist it?

sorry if you’ve explained any of that above.

 

The belt AutoZone gave me I believe was too wide. It's now working fine but belt looks shredded.. could it be that it shaved off the excess belt? All I did was change idler pulley and put belt on. I did not mess with anything else.

 

Are they maybe giving you a coupe belt (older model and engine) than the redesigned 2007 model sedan belt?

 

Thank you for bringing that to my attention. I did notice the belt extra tight even with the tension off. I'll take it tomorrow to the auto parts store. Hopefully it was that

 

Or you didn't verify that it was 100% seated into the grooves on one of the grooved pulleys. It will definitely shred off a ribbing if it's not actually seated into the rib of the pulley. You would he able to visually verify this usually before you remove the shredded belt.

 

I have an '08 and Autozone says the belt is 810K7 for mine and that appears to be what you have on there as well. The '07 and '08 should use the same belt. I see multiple references to that same p/n with Advance Auto, Continental, etc. Even if you didn't install the idler pulley 100% right, I'm hesitant to blame that since the idler is smooth and can't shred the belt. It also doesn't "align" it to my knowledge. It is only for changing direction of the belt, I believe.