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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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09-17-2013, 07:49 PM | #1 |
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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.
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09-17-2013, 07:56 PM | #2 |
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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.
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09-17-2013, 08:10 PM | #3 |
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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.
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09-17-2013, 08:21 PM | #4 |
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Shit! something looks weird...........
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09-17-2013, 09:08 PM | #5 |
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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? |
09-17-2013, 09:11 PM | #6 |
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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? |
09-17-2013, 10:55 PM | #7 |
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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...
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09-17-2013, 11:08 PM | #8 |
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Shiit. Why not take it back to the shop? They should be fixing/responsible
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09-17-2013, 11:13 PM | #9 |
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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 |
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09-17-2013, 11:34 PM | #10 |
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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. |
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09-18-2013, 05:13 AM | #11 |
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Man, it's $6 as listed above, and takes about 10 minutes. Why would you risk that?
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09-18-2013, 05:23 AM | #12 | |
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Quote:
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. |
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09-18-2013, 02:18 PM | #13 | ||
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Quote:
Quote:
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.
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- Clear Bra - 35% tint - Fa20 club intake - Rev Works header - Perrin OP - 3 inch FP - Resonated CB - Perrin LW crank pulley - Fortune Auto 500 V4 coil overs... pinky sized gap - Full CS knock off poly lip kit - JDM clear side markers - RPF1 18x8 - 35 offset - square 225-18-40 - Perrin shifter bushing - KartBoy positive shift kit - Hawk HPS pads - SS Lines - Visconti e85 tuned
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09-27-2013, 04:55 PM | #14 |
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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.
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- Clear Bra - 35% tint - Fa20 club intake - Rev Works header - Perrin OP - 3 inch FP - Resonated CB - Perrin LW crank pulley - Fortune Auto 500 V4 coil overs... pinky sized gap - Full CS knock off poly lip kit - JDM clear side markers - RPF1 18x8 - 35 offset - square 225-18-40 - Perrin shifter bushing - KartBoy positive shift kit - Hawk HPS pads - SS Lines - Visconti e85 tuned
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