Mugen MBX8
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#946
Tech Initiate
He sold it right now. Never he keep the clutch system more than some hrs. He will add it again
#947
well i dont have mbx8 right now front of me.but on agama sv and rc8b3.1 this doesnt happend.i thing its not normal.and in mind its like somehow ur diff inside its loose and when u put side pressure the gears inside moves to the other side than u do pressure and stuck.i cant explane in english well.u need wait someone with mbx8 to check it.but i thing its not normal
In the end I had just and empty diffcup and spur gear with the outdrives in it and it still locked up. So no O-rings, washer, gears or the small pins inside the diff. Just and empty diff with outdrives that I could pull out if I wanted to.
This made me belief that the outdrive or diffcup has a small mark in it that made it lock. I created a fine polishing tool for my dremel and started to polish the inside of the diffcup where the outdrive goes. Then I put the outdrive in a drill and polished the outdrive. After mouting everything back together is better, but still not like the front diff. But maybe it betters after running the car.
I'll do the rear diff tomorrow and see how it goes.
Or maybe the grease is bad that I'm using? I'm using Mobil 1 100% synthetic grease (the red stuff). I always used that on my MBX6 and MBX7 and never had problems with it. But I didn't race RC for 5 years and I my grease is about 10 years old now. Maybe there is something better for that purpose now.
#948
What is the best grease for coating the ring and pinion gears on the front and rear diffs? Need one that doesn't sling off.
#949
Tech Fanatic
Going overboard with hi-tech grease there can have an opposite effect and wear out the gears.
#950
Tech Initiate
Answer
I remove the diff from the car and started remove parts inside the diff until it was free.
In the end I had just and empty diffcup and spur gear with the outdrives in it and it still locked up. So no O-rings, washer, gears or the small pins inside the diff. Just and empty diff with outdrives that I could pull out if I wanted to.
This made me belief that the outdrive or diffcup has a small mark in it that made it lock. I created a fine polishing tool for my dremel and started to polish the inside of the diffcup where the outdrive goes. Then I put the outdrive in a drill and polished the outdrive. After mouting everything back together is better, but still not like the front diff. But maybe it betters after running the car.
I'll do the rear diff tomorrow and see how it goes.
Or maybe the grease is bad that I'm using? I'm using Mobil 1 100% synthetic grease (the red stuff). I always used that on my MBX6 and MBX7 and never had problems with it. But I didn't race RC for 5 years and I my grease is about 10 years old now. Maybe there is something better for that purpose now.
In the end I had just and empty diffcup and spur gear with the outdrives in it and it still locked up. So no O-rings, washer, gears or the small pins inside the diff. Just and empty diff with outdrives that I could pull out if I wanted to.
This made me belief that the outdrive or diffcup has a small mark in it that made it lock. I created a fine polishing tool for my dremel and started to polish the inside of the diffcup where the outdrive goes. Then I put the outdrive in a drill and polished the outdrive. After mouting everything back together is better, but still not like the front diff. But maybe it betters after running the car.
I'll do the rear diff tomorrow and see how it goes.
Or maybe the grease is bad that I'm using? I'm using Mobil 1 100% synthetic grease (the red stuff). I always used that on my MBX6 and MBX7 and never had problems with it. But I didn't race RC for 5 years and I my grease is about 10 years old now. Maybe there is something better for that purpose now.
#951
Tech Initiate
#952
I'll run it first to see it that makes it better.
And on the rear diff, it's the left side (gear side). I still have to rebuild that one.
#953
I checked the play it feels normal compared to the gear side. After rebuilding the diff and polishing the diffcup and outdrive, the front is now pretty smooth and the rear outdrive seems to lockup a bit.
I'll run it first to see it that makes it better.
And on the rear diff, it's the left side (gear side). I still have to rebuild that one.
I'll run it first to see it that makes it better.
And on the rear diff, it's the left side (gear side). I still have to rebuild that one.
Then cleaned of the polish with some brake cleaner and regrease with Mobil 1 grease. It's super smooth now.
I'm not sure why it got stuck in the first place. I suppose the grease was worn out or some dirt entered.
I hope it stays smooth for longer than 1 day at the track.
#954
I went to the track this morning after I polished the outdrives of my diffs earlier this week and it's a car different now. Our astro track was pretty damp this morning and then it's really slippery. But instead of having massive oversteer, the car was understeering a little bit on power instead of spinning out like a 2WD buggy. I'm glad the issue is solved. The car is now a lot easier to drive :-)
#955
Tech Adept
#956
Tech Adept
i got some buku composite shoes which recommend being used with a vented clutchbell so i got a mugen bell but when shimming, the crankshaft does not protrude past the bearing thus a washer on the screw tightens down on the bearing causing binding.. i used 2 tiny washers the same OD as the shaft and it appears to be working but i am worried about not having a wider washer on the end.. is this a problem?
#957
i got some buku composite shoes which recommend being used with a vented clutchbell so i got a mugen bell but when shimming, the crankshaft does not protrude past the bearing thus a washer on the screw tightens down on the bearing causing binding.. i used 2 tiny washers the same OD as the shaft and it appears to be working but i am worried about not having a wider washer on the end.. is this a problem?
#958
Tech Addict
iTrader: (5)
I went to the track this morning after I polished the outdrives of my diffs earlier this week and it's a car different now. Our astro track was pretty damp this morning and then it's really slippery. But instead of having massive oversteer, the car was understeering a little bit on power instead of spinning out like a 2WD buggy. I'm glad the issue is solved. The car is now a lot easier to drive :-)
#959
But I will keep doing this during my diff rebuilds if the outdrive still have a black layer of them after cleaning them with a rag.
#960
Tech Rookie
Really you would only need to polish the out drives and diff cup plus the ring gear if the out drives didn't spin freely after you first insert them into the ring gear or diff cup with nothing else in there.