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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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11-01-2023, 09:41 AM | #1 |
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Transmission shaft play (damage?)
Good day all.
Similar to what @chaoskaze experienced with his transmission after clutch replacement (Similar thread), I started experiencing a certain vibration nearing the 3000rpm range. This vibration was felt even more while decelerating and especially in 5th gear. When I replaced the clutch components, I decided on new Exedy flywheel, ARP flywheel bolts, Exedy Stg1 kit (including input shaft bearing and obviously replacing the infamous clutch release bearing with the updated part. I'll be posting pictures of the old components (here), replaced after approximately 100k miles of use (they didn't look pretty), car approximately ~155k miles on car. At time of clutch replacement, there was a little bit of trouble with the throwout bearing (surprised it lasted so long). In the meantime, here is a video of the teardown and primary issue, as stated by the mechanic. Shaft Play Video Not discarding anything as a root cause or contributor at this point in time, my initial question would be what can create such shaft play? PS This is a completely OEM daily driver with the exception of tires. Last edited by sato; 11-02-2023 at 11:57 PM. Reason: Update to initial post |
The Following User Says Thank You to sato For This Useful Post: | alphasaur (11-01-2023) |
11-01-2023, 01:16 PM | #2 |
extra what?
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That play is normal. Radial alignment is maintained by the pilot bearing in the crankshaft. The input shaft actually needs some play to account for manufacturing imperfection.
edit: I used the wrong term to describe the type of alignment in question.
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Last edited by Ultramaroon; 11-04-2023 at 03:43 PM. Reason: "radial" was "axial" |
11-03-2023, 12:03 AM | #3 | |
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NOTE: Added pictures and video regarding previous clutch replacement in 1st post (for reference only).
Quote:
I do ask though, is there such a thing as too much play (like the mechanic was stating)? Is there a specification for such play in the repair manual (perhaps)? |
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11-03-2023, 04:56 PM | #4 |
extra what?
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Yes, there can be too much play but the manual does not specify an inspection. That joint is a slip fit for good reason. With each reversal of torque applied to the input shaft, the bearing slides until it comes to rest against the opposite retaining clip. It is also swimming in oil as it does so.
By design, the input and output shafts are driven apart by the mid shaft whenever forward torque is applied. Under engine braking, the axial forces are reversed. I wonder much more about what that bearing does to the case when it slams back and forth under wheel hop. That's why I swapped my original transmission for a salvaged one. I'm still twelve years old on the inside and I like it that way.
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11-03-2023, 05:21 PM | #5 |
extra what?
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Now that I've watched your video clip a few times, I think I've had it wrong. I couldn't believe that the trans front cover - the quill - was the thing reacting to the input shaft bearing. Now I see that it must!
This means that the axial hammering from wheel hop causes the ONE clip in between the case and cover to slam back and forth. Hmmm... o.0
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The Following User Says Thank You to Ultramaroon For This Useful Post: | bcj (11-04-2023) |
08-08-2024, 10:49 PM | #6 |
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Small update (sorry for necro).
My car was "finished", which included: - "worn" bellhousing replaced - new ball bearings (all) installed - new six gear kit (updated part) - all new synchros (essentially, we refreshed the transmission) End result: We still have the rattle while decelerating around 3200-ish RPM (approximately), which is still worse in 5th than any other gear. Guess issue wasn't the bellhousing/bearing play. Fast forward a bit, we did replace the rear subframe bushings with OEM parts (torn apart) but noise persists. Also, the "new" (replaced) driveshaft had a little bit of wobble, and it had a segment replaced/balanced. Still noise persists. One thing we didn't replace were the front differential mount bushings, since they only come with the 41102-30030 (Carrier Sub-Assy, Differential W/Mount). Still, we can replace SU003-01010 and SU003-01011 upper and lower stoppers (2 ea). On that note, would any of you consider this vertical play (https://photos.google.com/photo/AF1Q...Bd_ZvugjN1posE) excessive and/or possibly adding to the problem? |
08-08-2024, 11:08 PM | #7 |
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You said you got a new flywheel and clutch kit. Have you considered that such a rattle could be from flywheel/clutch chatter?
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