Crank Pully Wobble... With video
 

Hey guys... Here is a link to a video of my crank pulley. [ame="http://www.youtube.com/watch?v=fVOSt3_Xwn0"]FT86 Crank Pulley Wobble - YouTube[/ame] What is confusing me, is that the actual pulley looks like it has zero wobble to it... however the bolt that the pulley rotates with has some serious wobble... almost as if it is off center which makes no sense because of how the bolt can only fit completely centered on the pulley... (confusing I know) is this normal? What are your thoughts. As always, thank you for any help you can give.

The way bolts are rolled the head/flange isn't always perfectly center with the shank of the bolt so it's completely possible the head if offset. You can use a dial indicator and turn the motor over by hand to double check the pulley is straight.

It doesn't look like wobble as much as it looks like there is a slight gap between the ID of the pulley and OD of the bolt. Like when someone has some mud just on part of their tire and it looks like it's really out of balance but actually isn't.

Shit! something looks weird...........Attachment 51597

I would guess that as you torqued it, the head pulled a little to one side.
How long is the bolt? Does it have a little slop in the shank? Is there a washer?

Maybe a dab of grease under the head before you thread it on would help it stay centered?

Stop running the car. Get a new bolt.

There's no wobble in the pulley, it's running true. But that bolts certainly isn't. I would also be VERY careful taking that bolt out.

How did you torque it down? Step by step, exactly what did you do?

I paid a shop to do it... I'm just going to go rent tools at autozone and go do this myself. Now I just gotta figure out this part number...

Shiit. Why not take it back to the shop? They should be fixing/responsible

Funny that the manual says:

"Apply engine oil to the thread and washer of crankshaft pulley set bolt."

Part is: Crnkshft pulley bolt 2.0 LITER

http://estore.subarupartswarehouse.c...icleid=1504929

Only $6

meh, mines been doing that since I installed the crank pulley 20,000 miles ago. its just an illusion. youre good.

if the bolt IS actually off, you'd notice it within a 1/4 mile of driving. you engine wouldn't run proper AT ALL.

Man, it's $6 as listed above, and takes about 10 minutes. Why would you risk that?

You'll need an 8mm socket or nut driver (I prefer a nut driver) for two hose clamps. A pair of pliers or strong finger for another hose clamp on a vacuum line. A 10mm socket or nut driver for, three or four small bolts. Pull the sound tube off the diaphram, the inlet hose off the throttle body, and the PCV line off the inlet hose. Take the bolts out holding the filter housing, be careful one hides down a little farther on your right hand side. Being careful of the MAF wires, flip the filter housing up on top of the engine. Use a 14mm wrench to loosen the belt tensioner and pull the belt off of a pulley. Put car in 6th, take out crank bolt. Install new bolt, lube the head of the bolt and thread, torque to 90 ftlbs.

I've seen a few different torque specs, but all are around 90. Some were down to 83 and some up to 94 IIRC. The manual states 14 ftlbs and then 90*. I'm not a fan of torque to yield for this application, but to each their own.

I know this would probably be the right thing to do... IDK why but I don't really trust these guys with my car anymore lol

Thanks for the link!

I wish I could convince myself that this was just an illusion... but I cant lol. I cant "feel the wobble", but it only makes sense that it shouldn't be doing this.

just to wrap this thread up. I replaced the crank pulley bolt... during this process I discovered that the bolt had been installed at about 115lbs... after replacing the bolt and going for 90lbs on the torque wrench there is now very very very little wobble... scary part is that the car actually feels smoother too. Thanks again for the help guys.