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Old 04-11-2012, 07:30 AM   #12161
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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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Old 04-11-2012, 10:02 AM   #12162
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Peter Cho is a good asian.
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Old 04-11-2012, 11:54 AM   #12163
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Quote:
Originally Posted by olderguy View Post
Drive shaft bolts have an oversize shoulder found nowhere else on a Miata.
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.)
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Old 04-11-2012, 12:02 PM   #12164
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Do want.

http://denver.craigslist.org/cto/2882386006.html

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Rare 124 chassis wagon powered by a really rare low mileage (115 k) AMG engine & transmission transplanted from a C36 AMG. Not a soccer mom's wagon any more, unless she's Danica Patrick. 3rd row seating folds down as will the middle row seats to make an expansive cargo area. You can camp in this car. Factory roof rack with an included ski/bikeand a receiver hitch to take an included 4 bike carrier make this an impressive weekend warrior machine. Equipment includes tinted windows, MP3 compatible 8 speaker stereo, prewired for an included XM receiver, retractable / removable factory cargo cover/dog net, electric seats & windows, cold A/C, 16" Mercedes factory wheels with great tires. Any new parts needed when swapping the engine were replaced. Mechanic owned, it's in better shape than any other one you could find. New ceramic brake pads for no nasty black dust & squeal typical on most Mercedes. The engine & trans were resealed in the swapping phase, there's not a drip of anything under this car. All new service items were included too, of course. Mobil 1 oil & filter, transmission filter & synthetic fluid, spark plugs. Two front airbags & SRS seatbelts along with ABS brakes & legendary Mercedes body safety designs make this a very safe car for you, friends & family. Full disclosures: the car has 200,000 mile on it. I swear you can't tell by looking. It's a beautiful head turner, inside & out. There's not a single crack in the dashboard. There is some cosmetic cracking in the (real) wood trim piece at the shifter. The window tinting has scratches in a couple of spots, not that you'll really notice, especially while driving. There is a wear spot on the driver's seat where it's practically invisible except when cleaning the car. The body is pretty darned good but you'll see a couple of dings. It's used & meant to be used. The glass is very good, even the Genuine Mercedes factory windshield is only a few months old. Will consider Mercedes trade
Link to more pictures: https://picasaweb.google.com/Grubaug...eat=directlink


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Old 04-11-2012, 12:03 PM   #12165
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Quote:
Originally Posted by olderguy View Post
Drive shaft bolts have an oversize shoulder found nowhere else on a Miata. I would put something on temporarily and order an OEM set.
^This.

Quote:
Originally Posted by Joe Perez View Post
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.)
The bolts I removed had an unusually wide shoulder to them as well, Joe. I would speculate that your bolts are not OEM.
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Old 04-11-2012, 12:43 PM   #12166
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Quote:
Originally Posted by blaen99 View Post
The bolts I removed had an unusually wide shoulder to them as well, Joe. I would speculate that your bolts are not OEM.
Yes, I understand what everyone is saying about the wide shoulder. That's how galvanized class 10.9 bolts are made. Here is a typical example:



Have you folks been finding bolts with a wider shoulder than this in your propshafts?
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Old 04-11-2012, 12:45 PM   #12167
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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.
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Old 04-11-2012, 12:47 PM   #12168
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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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Old 04-11-2012, 12:49 PM   #12169
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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?
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Old 04-11-2012, 12:55 PM   #12170
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Quote:
Originally Posted by blaen99 View Post
So, it may be that 1.8 and 1.6 driveshaft bolts are different.
the flanges are different thicknesses.
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Old 04-11-2012, 12:56 PM   #12171
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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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Old 04-11-2012, 01:11 PM   #12172
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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.
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Old 04-11-2012, 01:38 PM   #12173
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Quote:
Originally Posted by blaen99 View Post
So, it may be that 1.8 and 1.6 driveshaft bolts are different.
(...)
Interesting. You run a 1.8 diff Joe?
They are most certain different insofar as the diameter of the shaft. When I replaced the 1.6 diff in my '92 with a 1.8 Torsen, the old bolts which I removed from the car did not fit properly in the holes of the new diff and shaft- the 1.8 parts required a larger diameter bolt.

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.
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Old 04-11-2012, 01:39 PM   #12174
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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.
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Old 04-11-2012, 01:54 PM   #12175
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Quote:
Originally Posted by blaen99 View Post
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?!?
Yes. Please ensure that you use proper lighting, particularly while under the car. Thank you.
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Old 04-11-2012, 01:55 PM   #12176
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Quote:
Originally Posted by Joe Perez View Post
Yes. Please ensure that you use proper lighting, particularly while under the car. Thank you.
---- that ----, I concede the argument completely to you in that case. ><

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.
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Old 04-11-2012, 05:03 PM   #12177
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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.
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Old 04-11-2012, 05:15 PM   #12178
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Quote:
Originally Posted by Joe Perez View Post
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.
It's the same for RX7s, and every other Mazda I've ever worked on, and most other Mazda's I would imagine Joe. Nut on front, bolt inserted from rear.
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Old 04-11-2012, 05:24 PM   #12179
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Originally Posted by blaen99 View Post
Nut on front... inserted from rear.
lol

It's like I'm 5 or something
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Old 04-11-2012, 05:26 PM   #12180
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lol

It's like I'm 5 or something
It's like the whole forum is 5, bro!
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