lee82gx
Active Member
Ok, introduction:
1. I bought a used Kraton 6s, it had very heavy wear on the diff outdrives front and rear.
2. Center diff looked ok - FWIW
3. I figured I'd service and rebuild all 3 diffs with fresh Oils, per original specs.
4. Center diff was just topped up with 100k fluid and re-assembled. I think I put too much and it oozed out of the screw holes as I screwed down the diff case to the spur gear.
3 x 6s packs later, after quite a bit of WOT, I gently tapped a goal post at <3km/h, walking speed, on the bumper.
After which I heard a weird gear mesh sound and in about 3 minutes, lost drive, the spur was turning but the wheels struggled.
I guessed since both front and rear wheels struggled to turn it was the center diff. And here is the post mortem:
First photo shows the sun gear worn. This is at the diff case side.
I noticed the screws were not tight - could this be due to my overfilling with fluid? The diff oils were squeezing out during my screwing in process.
I did not screw so tight until "11" but was probably "just tight".
I've ordered a new set of gears but due to my location - Malaysia will need easily 2 weeks ETA.
So, now I have a lot of time and nothing much to do while waiting for the new part.... so questions:
1. The wear does not look too bad?
1.1 When I re-assemble and try to spin the outdrives with the spur gear clamped, I'd lose the mesh if I backed out the screws by maybe 1mm, does this mean If i re assemble and tighten I can get them to mesh again?
2. Looking at the 2nd photo, I don't think I damaged the planetary gears, and I didn't show the spur side sun gear and that was fine also.
2.1 I highlighted a gap when the planetary gears are seated down, there seems to be a 0.7mm gap between the backer piece and the top surface of the diff case.
2.1.1 Is this normal? Is it supposed to be flush or a bit down?
3. Do you guys reckon I can shim up the sun gear by 0.7mm upwards base on 2nd picture, re-gasket and tighten and use it again?
4. I need to purchase and irreversibly use a new gasket as I damaged it during this disassembly....cheap me would not like to spend another dime if un-necessary.
Should I roll the dice?
THis is my first metal gear heavy oil filled diff (I have only previously played with 1/10 touring with ball diffs) that has ever blown, I'm kinda bummed, is this a regular feature with 6s 1/8 cars? To think that there are 3 diffs to maintain.....??
1. I bought a used Kraton 6s, it had very heavy wear on the diff outdrives front and rear.
2. Center diff looked ok - FWIW
3. I figured I'd service and rebuild all 3 diffs with fresh Oils, per original specs.
4. Center diff was just topped up with 100k fluid and re-assembled. I think I put too much and it oozed out of the screw holes as I screwed down the diff case to the spur gear.
3 x 6s packs later, after quite a bit of WOT, I gently tapped a goal post at <3km/h, walking speed, on the bumper.
After which I heard a weird gear mesh sound and in about 3 minutes, lost drive, the spur was turning but the wheels struggled.
I guessed since both front and rear wheels struggled to turn it was the center diff. And here is the post mortem:
First photo shows the sun gear worn. This is at the diff case side.
I noticed the screws were not tight - could this be due to my overfilling with fluid? The diff oils were squeezing out during my screwing in process.
I did not screw so tight until "11" but was probably "just tight".
I've ordered a new set of gears but due to my location - Malaysia will need easily 2 weeks ETA.
So, now I have a lot of time and nothing much to do while waiting for the new part.... so questions:
1. The wear does not look too bad?
1.1 When I re-assemble and try to spin the outdrives with the spur gear clamped, I'd lose the mesh if I backed out the screws by maybe 1mm, does this mean If i re assemble and tighten I can get them to mesh again?
2. Looking at the 2nd photo, I don't think I damaged the planetary gears, and I didn't show the spur side sun gear and that was fine also.
2.1 I highlighted a gap when the planetary gears are seated down, there seems to be a 0.7mm gap between the backer piece and the top surface of the diff case.
2.1.1 Is this normal? Is it supposed to be flush or a bit down?
3. Do you guys reckon I can shim up the sun gear by 0.7mm upwards base on 2nd picture, re-gasket and tighten and use it again?
4. I need to purchase and irreversibly use a new gasket as I damaged it during this disassembly....cheap me would not like to spend another dime if un-necessary.
Should I roll the dice?
THis is my first metal gear heavy oil filled diff (I have only previously played with 1/10 touring with ball diffs) that has ever blown, I'm kinda bummed, is this a regular feature with 6s 1/8 cars? To think that there are 3 diffs to maintain.....??