Shock and diff fluid

[Badsneaker]

Should I change out the shock and diff fluid on my MP6 Kyosho buggy? It has probably not been changed in at least 3 years. The shocks have decent rebound, and don't appear to be leaking.

Do I have to remove the diff carriers and disassemble the diffs to change the oil?

Thanks

 

[jetmechG550]

Dude, yes!!!!! I change/rebuild my difs about every gallon and shocks go a little longers. The difs are prolly empty. And yes they come out of the dif case or carrier and open them up.

 

[SkyMaxx]

Definitely. Your shocks might even be empty or close to it at this point. The caveat to this is dependent on how much driving has gone on in the three years. If none or close to none, then things might still be good...but I would recommend checking them out anyway...sometimes oil does not age well.

 

[Badsneaker]

Ok got it will do. I don't know when it was last changed. So that will be my weekend project. The buggy has sat for at least 3 years without running. I've changed the 8 axle bearings and installed the motor and clutch so far.

So now my question...

I have a bottle of Kyosho Silicone Oil 7000. Its very thick. I assume this is for the diffs and transfer case. I have a bottle of Trinity Shock oil 40wt. I assume this will be OK for the shocks front and back to start with? I hope I'm assuming too much because you what happens when you assume too much....!!

Thanks again guys

 

[SkyMaxx]

Yes, yes, and yes. Depending on the age of the oils/silicone mentioned, you should be good to go.

 

[Badsneaker]

Ok guys screw this weekends project! I just pulled the left front shock off and it was full. I'll check the rest. The diffs will be a little more work. That I will do this weekend!

Thanks for everyones help as usual.

 

[jetmechG550]

Yeah but were they clear or did it look like murkey water?

 

[Badsneaker]

Clear and very clean looking. I think I will proabably reseal the shocks and put new fluid in anyways, just because. The left rear shock looks like it has a little seepage. I'll let you guys know what the diffs look like this weekend.

 

[bjr4848]

Make sure when you do the shocks you get all of the air bubbles out. Someone taught me to work the pistons up and down very slow and let them sit for an hour or so and when you come back see if any bubbles floated to the top. Hopefully someone else with more experience will help tell you the right way to go about doing this! And you've inspired me to check my shocks. Doh! It's been awhile.

 

[SkyMaxx]

Here is a post I made a loooong time ago about rebuilding shocks. It might prove useful here...(search is my frien )

Wow...where to start? First of all, you need to properly bleed the shocks when you fill them. Awww, hell. Let's start from the beginning.

1. Open the shock.
2. Remove old oil/silicone.
3. Disassemble shock.
4. Clean shock with some dish soap and a bottle brush.
5. Replace any worn seals/o-rings.
6. Re-assemble shock.
7. Pull shock plunger until it is bottomed out.
8. Fill shock until about 1/8" from the top with oil/silicone of your choice.
9. Slowly move shock plunger up and down to get any air out. You should see little bubbles rising through the oil. Heating the oil first will reduce the time it takes to bleed the air out.
10. Once all bubbles have seeped out, fill shock the rest of the way.
11. With shock cap in one hand, slowly compress the shock plunger until the oil/silicone just bulges above the edge of the shock body.
12. Cap the shock. You will get oil/silicone seepage from the thread area as you tighten down the cap. You should also see the shock shaft start to push out.
13. Clean up excess oil/silicone from shock body, and tighten down shock cap until it is snug (hand tightened should be fine).
14. Test shock by compressing it all the way and letting go. The shaft should rebound about 1/4-1/2 its length (or between 1/4 and 3/4 of an inch).
15. Good rebound means good build. Place spring retainers and springs on the shocks.
16. Install them and bash away.

 

[Saber]

What weight shock oil do you all use for front and rears on your 1/8th buggies? I have a Mugen MBX4 and a Kyosho MP777 and would like to try different setups in the shock area and was wondering what weight oil some of you guys are using in your shocks? My Mugen does fine with what it has But my Kyosho likes to bottom out quite hard. I have compressed the springs almost too much if you ask me and was thinking I could change the shock oil to a thicker weight or change the damping pistons. Any thoughts??

 

[Saber]

Anybody??

 

[jon2]

On my buggies I have used 40-45 weight in the front

and 30-40 weight in the rear. It fits my driving style off track. On track is another question. I am still figuring out what I like. I use Mugen Grey springs.

 

[Saber]

Thanks, I think I use 30wt in all four shocks but I am not sure. I think I will rebuild them this weekend and try some different things. I didn't even think about the springs , that may be a really simple fix.