Zenobia K'ael

Hi guys i just got my mazda trix lightweight flywheel in for my 82 FB, i bought an 82 counter weight and paired it with the larger 83+ year flywheel so i could take advantage of the better clutches that seem to be readily availible for them.

anyway i have the 83+flywheel that is 225m and i paired it with an FC oem replacement clutch from exedy. (model# 10038) and the pressure plate wont fit over the pegs that are on the pressure plate. its like the pegs arent placed outward enough and are a couple thousandths of an inch under.

My question is. Has anyone else had this issue? did i goof somewhere im my selection of clutch kits for this flywheel?

mustanghammer

iTrader: (3)

Did you purchase a Flywheel that is for the 74-82 Rotary from Mazdatrix? If you did, that is the issue.

12A and 13B Non-turbo engines used two different clutch diameters. From 74-82 the clutch diameter is 215mm, from 83-92 the diameter is 225mm. Which would explain why the locating dowels are not quite in the right place. Note that flywheels from all of these years are all the same diameter - the starter ring gear in the same place on all of them.

The counter weight will fit any of the flywheels that Mazdatrix sells including Turbo flywheels so that is not a concern assuming you have an 82 engine in your car.

Zenobia K'ael

negative, its a 83+ model flywheel that is 225mm. the clutch is for an NA FC. so also 225m.

Maxwedge

iTrader: (1)

MazdaTrix lists the Exedy 10038 you got as a 225mm non-turbo model for 89-92, which I don't understand. I knew early rotaries up to 82 use 215mm, and non-turbos from 83-91 use 225mm, and Turbo & RX8 use 240mm. Did something change with the pressure plate to flywheel bolt pattern when the S5 cars came out?

Zenobia BTW I just installed the Racing Beat #11437 83-92 NT steel flywheel with the Exedy #10806 "stage 1" NT clutch (both from MazdaTrix) and everything bolted together fine. There's something funny about the listing for your 10038 clutch kit.

Hot_Dog

Not sure I understand what you're saying? You're saying that the dowel pins on the new flywheel aren't long enough? Do the dowel pins in the flywheel lineup alright with the holes in the pressure plate? You've got a photo?

Have you tried contacting Mazdatrix about this problem?

Maxwedge

iTrader: (1)

Which lightweight flywheel # did you get? Mine is a RB lightweight steel and it doesn't have any dowels like the original - it's just 6 bolts.

Zenobia K'ael

i bought this one.

https://www.mazdatrix.com/product/83...inum-flywheel/

the alignment pins are long enough. they just arent spaced correctly. i can get the pressure plate over one alignment pin. but the other 2 arent far enough out. (the radii of the other two pins are not far enough out. they barely dont go out enough to fit into the other tow holes pressure. they are inboard too much)

ill try to getr a picture later.

i plan on contacting mazda trix tomorrow, they are closed sat and sunday :/

Hot_Dog

Exedy gives p/n's for their clutch kits as:
1986-88 S4 RX7 Non-turbo: p/n 10025 (actually, this will fit 83-88)
1989-91 S5 RX7 Non-turbo: p/n 10038

I have an S5 non-turbo with stock flywheel and have used p/n 10025 once or twice before. It fits without any issues, but the two pressure plates are slightly different. I would think that the two pressure plates are interchangeable on an S4 too, but I can't confirm that. Maybe you were sent the wrong pressure plate (i.e., mis-boxed)? Is there a p/n on your pressure plate? If so, than maybe you can contact Exedy (or search the web) to check if it's the right one.

Zenobia K'ael

Zenobia K'ael

thats what came with the 10038.

is the PCD on the pressure plate for the 10806 different?

Hot_Dog

Here's what I pulled off the web for Exedy clutch kit 10038. Part numbers for pressure plate MZC591; disc MZD059U; bearing BRG091 So. that's the right pressure plate for the S5 NT.

Here's what the pressure plates looked like for kits 10025 and 10038:
Exedy clutch kit 10025 83-88 Exedy clutch kit (https://www.ebay.com/p/110120531)
Exedy clutch kit 10038 89-91 Exedy clutch kit (https://www.ebay.com/p/110267541)

According to Mazda technical data, the only difference between the discs is the lining thickness. For 89-91 NT, lining thickness is 3.2mm and 3.2mm. For 86-88 NT, lining thickness is 3.5mm (flywheel side) and 4.1mm.

From the photos it looks to me, that for the two pressure plates (10025 & 10038), the small hole might possibly be in a different position relative to the large hole. I don't know what that small hole is for or if it serves any useful purpose.

Maxwedge

iTrader: (1)

By "small hole" I assume you mean the one in 5 o'clock position in Zen's last pic. The instructions for my Exedy clutch kit only used that little hole for a reference mark; the first bolt installed was a pilot bolt and they told you to put it in the large hole with a smaller hole next to it. The smaller hole was not used for anything besides a reference to the 1st pilot bolt.

Hot_Dog

Yes, that's the hole I was referring to. So,it's just a reference hole. Ok, thanks for that info.

Ottoman5000

iTrader: (1)

You need the counterweight right?

where are you guys finding these counterweights at?
I can’t locate one for the life of me.

Maxwedge

iTrader: (1)

Racing Beat and MazdaTrix have them. Possibly Atkins and others. **Make sure you get the right one - they differ by year and engine size. They are weighted a little different to match the front weight and rotating assembly... this changed slightly with engine designs.

The stores I listed above sell them new (OE Mazda parts). You could get the part # off the site and see if your local Mazda dealer can get it. Some are NLA and rare, like my '74-'85 13B weight.

mustanghammer

iTrader: (3)

I use this guide: Identifying Rear Counterweights
You can get there by going to the Mazdatrix web site. Click on How-Tos and the opening the section called LINK TO OUR OLD WEB SITE.
Invaluable stuff there.

Banzai

iTrader: (13)

Thanks. I didn't know you could still access the old site. It also has a handy guide to help identify flywheels.

https://web.archive.org/web/20160311...q/flywheel.htm