| Author |
Message |
Lou Menditto (Lmenditt)
New member
Username: Lmenditt
Post Number: 7
Registered: 8-2001
| | Posted on Wednesday, November 13, 2002 - 4:13 pm: | |
Steve,
Thanks for the details. They might be a little thick but I think it is worth a try. I'll contact you offline about sources.
Lou |
Steve Magnusson (91tr)
Intermediate Member
Username: 91tr
Post Number: 1176
Registered: 1-2001
| | Posted on Tuesday, November 12, 2002 - 8:03 pm: | |
Lou -- Here's the data in the Fabory print catalog for the internal DIN 472 rings for the two bore sizes you noted:
45mm bore
ring thickness = 1.75mm
ring OD (free state) = 48.5mm
when installed in the 47.5 mm diameter groove the ears clear a 32mm diameter shaft
37mm bore
ring thickness = 1.5mm
ring OD (free state) = 39.8mm
when installed in the 39mm diameter groove the ears clear a 25.4mm diameter shaft
|
Tazio Nuvolari (Nuvolari)
New member
Username: Nuvolari
Post Number: 41
Registered: 9-2002
| | Posted on Tuesday, November 12, 2002 - 7:42 pm: | |
Hey Rob does the tranny re-build include the removal of assorted tow truck pieces ;) |
Lou Menditto (Lmenditt)
New member
Username: Lmenditt
Post Number: 6
Registered: 8-2001
| | Posted on Tuesday, November 12, 2002 - 6:13 pm: | |
Thanks Steve, that web site was very helpful. Note that I am looking for internal rings, not external ones, so it would be more like the DIN 472 rings on that website. The dimensions of
the rings I need are:
48mm dia x 1.5mm thick (bore is 45mm)
39mm dia x 1.5mm thick (bore is 37mm)
I can't measure the groove depth given its location within the case and my limited tools, but I measured the original retaining rings themselves.
JR, Thanks for the info. I was aware that the originals were designed without ears but I'd like to replace them with something that is easier to work with. So far I can't see any reason why the more typical style would be a detriment, other than being difficult to find :-)
Lou |
Verell Boaen (Verell)
Member
Username: Verell
Post Number: 434
Registered: 5-2001
| | Posted on Monday, November 11, 2002 - 8:12 pm: | |
Rob,
RE: 1st gen MAZDA tranny: You have my sympathies.
TRY A 2ND GEN NA TRANNY...
BTW, the 2nd gen naturally aspirated tranny's are
essentially identical to the 1st gen trannys.
My son's '86 GXL tranny died a couple of years ago. We just swapped in the tranny from my '82 GSL. The 2nd gen tranny is supposed to be slightly stronger, but neither one has a rep. for being robust. Still, you might find a low mileage used one easier to come by than parts for rebuilding the 1st gen one.
BTW, a 2nd gen TurboII tranny can be installed in a 1st gen. I installed an '87 TurboII engine & tranny in my '82 Rx7. The tranny installation required some minor rework. You have to modify the TurboII trans. mount to mate up with the 1st gen's tranny mount bolts. Also have to swap the shift lever ass'y from the 1st gen tranny. One of the TII tranny's shift rods needs a hole drilled thru it in order to mount up the 1st gen shift ass'y.
I'VE GOT RX7 TRANNY WOES TOO:
My 2nd gen Rx7 TurboII winter 'daily driver' refused to go into reverse Friday. Pulled the trans & was about to put the 1 from my parts car in when I discovered pieces of clutch disk in the bell housing. Pulled clutch, found about 20% of disc had disentigrated. Turns out my 'trivial' oil leak I've never been able to locate had destroyed the clutch(sigh).
I'm pulling the intake manifold for the 3rd attempt at finding that @$!%%$% oil leak. This time I'm putting florescent dye in the oil & using an UV light.
Good luck with your 1st gen Rx7. |
JRV (Jrvall)
Junior Member
Username: Jrvall
Post Number: 55
Registered: 11-2002
| | Posted on Monday, November 11, 2002 - 4:39 pm: | |
The snap rings you refer to are not supposed to have holes. They require a different type of snap ring pliers to easily remove them. Baum Tools has all the different types of tools used on Euro cars. 800-848-6657 |
Rob Lay (Rob328gts)
Board Administrator
Username: Rob328gts
Post Number: 2691
Registered: 12-2000
| | Posted on Monday, November 11, 2002 - 4:09 pm: | |
Something to look foward to when I do a Ferrari trans. Right now I'm having enough problems getting parts for a 1st gen RX7 trans rebuild and they made hundreds of thousands of them. |
Steve Magnusson (91tr)
Intermediate Member
Username: 91tr
Post Number: 1175
Registered: 1-2001
| | Posted on Monday, November 11, 2002 - 3:52 pm: | |
Not an easy one Lou. My Fabory catalog shows the "normal" DIN external snap ring (with ears) as DIN 471:
http://www.metricfasteners.com/detail.asp?id=36000
There is more dimensional information in my Fabory print catalog (than on the website) so if you could measure:
1. the OD of the shaft (near the ring),
2. the diameter of the groove,
3. the width of the groove, and
4. and the thickness old ring
I could check to see if they are quasi-equivalent (assuming the ears don't cause other interference problems). If the DIN 471 would work then you can try working on the next impossible task of finding a place that has them and will sell you a few ;). |
Lou Menditto (Lmenditt)
New member
Username: Lmenditt
Post Number: 5
Registered: 8-2001
| | Posted on Monday, November 11, 2002 - 3:16 pm: | |
I'm in the process of rebuilding my Mondial T transmission. There are 3 snap rings that trap two of the bearings for the input and output shafts. I'm looking for a source for replacement snap rings and was hoping someone here knew of one. I'm not excited about buying Ferrari OEM replacements because the originals did not have the grab holes for use with snap ring pliers, so they were hell to get out. I've also tried the SAE sizes at NAPA, but the closest match they had was a bit too big and wouldn't fit. Thanks.
Lou |