The inner dimension of the seal is 7/8 inch on earlier gear boxes and 1 1/16 inch on post 69 gear boxes. The housing I have from the wreckers suits the 1 3/8 inch outer seal while the one in my current Elan gearbox suits the 1 5/8. The other key variation is the input shaft seal and housing as there are two housings one that suits a 1 3/8 inch seal outer diameter and one a 1 5/8 inch outer diameter. Maybe it was used with a later engine at some stage and the input shaft changed as the17 mm spigot require a special and thin walled and fragile oilite bush to fit into the 21mm hole in the 6 bolt crank. Why one of the pre 66 wide ratio Cortina boxes I have came with a 15mm spigot is not clear. Supposedly according to the Bean manual the 15mm spigot was used on semi close ratio boxes and 17 mm on all wide ratio and early close ratio boxes with the outer bearing / oilite bronze bush diameter varying with the 4 bolt ( 40mm) versus 6 bolt (21mm) cranks. Provided the rings are matched to the hub and the splines match on the shaft they are apparently interchangeable on the main shaft and gears.Īnother key variation is input shaft spigot size with one of my pre 66 wide ratio Cortina boxes having a 17mm spigot and the other 15mm. These hubs came in two versions using the earlier synchro rings for the draw nut version and later synchro rings for the snap ring version so I will need rings to match the hub and rings that I source. The Quaife gear set uses the later 1.29 inch spline for the synchro hub so I will need to source a later synchro hub. My original 68 Elan shaft in the photo shows these differences. Both have the sleeved 1st gear and the resultant smaller diameter 1/2 synchro hub spline of 1.20 inches compared to the 67 to 70 draw nut version and 70+ snap ring version which did not have the first gear sleeve and used a larger 1.29 inch spline for the 1/2 hub. The two gear boxes I have are both early wide ratio Cortina boxes pre 1966. The photo above compares the two shafts out of my spare wreckers gearboxes with the old main shaft from my 1968 Elan gear box which currently has a Quaife gearset in it that was installed in the 1990's I've no experience with Qaife gear sets, but found this thread: It was often the practice to modify the newer style synchro rings to allow the early blocker bars to fit, and to work with the early gearset assemblies. There was a time when new replacement early type synchro rings were hard to find or very expensive. circlip main shaft, synchro rings, blocker bars, synchro hubs, and no doubt more that I've forgotten since it's been a few years since I've been inside one. The synchro rings are just one of several differences snap ring vs. I've rebuilt 6 'boxes - 4 early Cortina types and 2 later ribbed types, and have 2 more and lots of parts waiting for me to get to. i always wanted to get a better idea around the issues of parts interchangeability across the various ages of three rail "2000e" boxes and now is my chance Rohan Rgh0 wrote: The differences in synchro hubs versions is not clear and something I will need to research once I get my 2 old gear boxes fully to bits to understand what is compatible or not with the Quaife gear sets. I would guess "promotor" knows more about this stuff already and will contribute here as he does lots of diffs and gearboxes i always wanted to get a better idea around the issues of parts interchangeability across the various ages of three rail "2000e" boxes and now is my chance The differences in synchro hubs versions is not clear and something I will need to research once I get my 2 old gear boxes fully to bits to understand what is compatible or not with the Quaife gear sets. Yes I need to reuse synchro hubs / change rods and forks from my old boxes to use with the new Quaife gear sets which come with new shafts and all other gear bits needed. Thanks for confirming the Mk1 cortina versus Mk2 cortina bellhousing and thus gearbox as i had suspected it was that based on the pilot bearing spigot diameter difference I'm not 100% sure if they are interchangeable. Main shafts and synchro hubs for example are also different. The later box has quite a few internal improvements compared to the earlier box. The ribbed box is the Mk2 Cortina 2000E type box. 2cams70 wrote:The non ribbed box is Mk1 Cortina.
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