Horatio
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Excellent post and description.I copy & pasted this from post I put on fb as couldn’t be ar$ed writing it again so if already seen it carry on lol
Erik van Ravenstein front/rear differential cases, diff mount insert & 42t spur installed. Done the front 1st must have had a premonition rear was going to cause issue, screw on hinge pin roundedbut I won that battle this time. Diffs installed & shimmed, shimming corally diffs can be a pain having to disassemble to add them my tip is sacrificial shims, I put on a couple to begin with then cut them off until mesh set, ended up 1 front none in rear.
What you never hear anyone talk about is the mesh on the internal gears in the diffs. You often see corally diffs leak, why is this? I believe there is too much play on the outdrive cups & that play prevents the oring sealing & when oil gets thinner after use you start to see leaking. On my diffs I would add extra shims m6x12x0.1mm behind the pin that holds the Outdrive this seals the oring better so hopefully no leaks & reduces the Outdrive wobble which should help reduce risk of diff failure/damage. I always set this by adding shims until the pin felt tight but not too tight, usually additional 0.2mm shims each side at most, I never added shims to the point where the mesh on internal gears was to tight, until I came to build the EVR diff cases. I added just 0.1mm shims either side & when I put the diff together the mesh was too tight to point it wouldn’t turn, I initially thought I put it together wrong, backed screws off on diff & it spun freely, pulled diff apart removed shim on one side, still too tight, removed the other shim & boom perfect , diff spun freely. It shows the tolerances EVR is working to is much tighter, even my corally 7075 centre diff has 0.2mm shims one side one side 0.1mm on the other & no sign of mesh being too tight. Anyone can check the diffs on their corally to see what I mean you don’t need to remove them just give you outdrives a wiggle see how much play in them. Just my 10cents on diffs use that info how ever you see fit. But EVR diffs for the win. Geared 19t/42t with 4292 1780kv see what it does go from there.
It’s not often you see EVR comment on posts about his parts he doesn’t advertise what he does whatsoever so was nice to get his input & see that I wasn’t barking up the wrong tree in regards to adding additional shims in the diff which I suggested on here in previous posts about leaking diffs.
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I've noticed my centre diff, as it cooks, tends to get leaky.
So, at some point over the next day or so, my Kronos is getting it's centre diff rebuilt - as per your advice. I haven't noticed any excessive wobble or play, but there's obvious leakage. I've got millions of shims, so between my 0.1 and 0.2's I should be able to get it spot on.
I might even go up to a thicker centre oil.
Plus, I get to use my improved workshop with better lighting and additional bench/units. When my peg board stuff arrives and is installed, I'll take some pictures.
I love your Speed Freak diffs. Incredible. I wish EVR would trade on eBay or something. I just don't do FB.
it’s a side hustle & his parts sell themselves plus not many out there who cater for corally. If you want anything from him just let me know Im happy to play piggy in the middle with you’s. I don’t know if he has email or any way to contact him but I’ll ask if you’re interested.
