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Drive shaft bolts have an oversize shoulder found nowhere else on a Miata. I would put something on temporarily and order an OEM set.
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Peter Cho is a good asian.
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Originally Posted by olderguy
(Post 862512)
Drive shaft bolts have an oversize shoulder found nowhere else on a Miata.
(Reason for replacing: In upgrading to a 1.8 diff and propshaft I needed larger diameter bolts.) |
Do want.
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Originally Posted by olderguy
(Post 862512)
Drive shaft bolts have an oversize shoulder found nowhere else on a Miata. I would put something on temporarily and order an OEM set.
Originally Posted by Joe Perez
(Post 862584)
I don't recall anything unusual about the driveshaft bolts I removed from my '92 Miata. They looked liked ordinary 10.9 shouldered bolts to me. Granted, there's nowhere else on the car that I can recall this type of fastener being used, but the ones I bought at ACE hardware had the same physical construction and markings as the ones I removed.
(Reason for replacing: In upgrading to a 1.8 diff and propshaft I needed larger diameter bolts.) |
1 Attachment(s)
Originally Posted by blaen99
(Post 862591)
The bolts I removed had an unusually wide shoulder to them as well, Joe. I would speculate that your bolts are not OEM.
https://www.miataturbo.net/attachmen...ine=1334159003 Have you folks been finding bolts with a wider shoulder than this in your propshafts? |
:squint: Joooeeeee.....
Joe, yes. The shoulder is substantially larger than that with my OEM bolts in my Miata. Stock class 10.9 bolts don't even match up remotely. |
Well, all I can say is that bolts of the style pictured above work just fine in a Miata at 210 WHP.
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So, it may be that 1.8 and 1.6 driveshaft bolts are different.
http://forum.miata.net/vb/showthread.php?t=236576 Interesting. You run a 1.8 diff Joe? |
Originally Posted by blaen99
(Post 862632)
So, it may be that 1.8 and 1.6 driveshaft bolts are different.
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Yeah, OG and I both have 1.6 cars, and if Joe runs a 1.8 diff, all may be explained then Brainy.
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:bowrofl:
I have a particular poster so butt-hurt this is the third time he's gone into my post history and negged everything he could. You know you win at life (and mt.net) when someone is so butthurt they do that. :rofl: |
Originally Posted by blaen99
(Post 862632)
So, it may be that 1.8 and 1.6 driveshaft bolts are different.
(...) Interesting. You run a 1.8 diff Joe? This applies only to the shaft of the bolt. It was something like 6mm on the 1.6 vs. 8mm on the 1.8 (I don't recall the exact dims, but something like that) and while I don't know what the head of the bolt used as OEM on the 1.8 cars looks like, the heads of the bolts which I removed from the 1.6 diff and shaft looked like plain ole 10.9 shouldered bolts of the style I pictured above. I'm also 99% certain that they were OEM, as that car had fairly low mileage and the PO had never really modified anything on it- factory radio, factory daisy-wheels, etc. I'm pretty sure I still have those bolts in a marked zip-loc bag at home in the garage, and I'll try to find them tonight. |
:vash: Are you trying to get me to go under my Miata and take a picture of the original driveshaft bolts (Huh..) vs. a 10.9 bolt of the same thread and size, Joe?!?
'Cause I really don't want to do that :(. Of course, the PO may have replaced the bolts since mine is a high-mileage example. Huh. |
Originally Posted by blaen99
(Post 862673)
:vash: Are you trying to get me to go under my Miata and take a picture of the original driveshaft bolts (Huh..) vs. a 10.9 bolt of the same thread and size, Joe?!?
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Originally Posted by Joe Perez
(Post 862685)
Yes. Please ensure that you use proper lighting, particularly while under the car. Thank you. :D
On a more serious note, I think it is more plausible that the PO in my car replaced the driveshaft bolts than the one in your car, so it may just be that the PO used non-OEM bolts - although I've never quite seen bolts like that before in that size, and I find it odd I'm not the only poster in the thread that has seen this. |
I could be totally wrong for all I know. It's been a couple of years since I've had to pull the propshaft out of a Miata. All I know with certainty is that after I did pull the shaft out of my '92, there was probably a good reason for me to seek out that particular bolt style and install it as the replacement. Heck, for all you know I could just be trolling. (I'm not.)
Circling back around to the original topic, however, every car from which I have ever uncoupled the propshaft from the differential (Miata, Forester, Celica) used a bolt-and-nut method, with a split lockwasher on the nut side. On a Miata, the bolt is inserted from the differential side, such that the head of the bolt faces towards the rear of the car. |
Originally Posted by Joe Perez
(Post 862797)
On a Miata, the bolt is inserted from the differential side, such that the head of the bolt faces towards the rear of the car.
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Originally Posted by blaen99
(Post 862804)
Nut on front... inserted from rear.
It's like I'm 5 or something :facepalm: |
Originally Posted by Jeff_Ciesielski
(Post 862809)
lol
It's like I'm 5 or something :facepalm: |
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