Hi CEN Racing.
I have a problem with my gearbox or any one way bearing inside the gearbox (I think) . What happen is that when i'm driving in snow the truck just stop moving and revs up to max rpm. It dosen't matter where I have the throttle ( idle, half open, max open it do this any way The only thing to solve this problem is to take it inside and dry it, after that it works just fine again) . So i stopped the engine to let it cool down, then after a while I started the engine and it runs very good so i started to drive then after about 5 meters it stopped and the engine revs up to maximum rpm and the throttle was a little more open then idle.
What makes the engine to do this? It has only happened when I drive in snow. Is it the gearbox or any one way bearing inside the gear box? I haven't lost the grub screw to the drive shafts.
I hope you understand or else I will try to explain again.

Thanks
jadda

Clutch getting wet on the front of the engine maybe? or the one way bearing on the second gear ( external) clutch pack, it has to be external i dont think its intenral unless your gear box isnt fully sealed? my guess might be the second gear one way bearing,


you just have to use method of elimination

when it happens again, give it alittle gas and confirm the spur gears are spinning if they are not then something is wrong with the engines clutch pack assembly, now look at the second gear shaft, but look at it on the side where the receiver pack is, give it alittle gas when it wont move, the spur gears will start spining, look at the other end of the gearbox and see if that shaft is indeed spinning, if its not, then its the one way bearing on the 2nd gear clutch assembly. Now if those two check out, check the output shafts on the gear box, if those are spinning too, then it could be your set screws that you mentioned, but its probably not that if you checked them already. now you can probably conclude that it is in fact an internal gearbox issue.

good luck hope this helps you find the problem.

Thanks paedbo.
No I can't give any gas because the engine is at max rpm so if I give it more gas it will only stay at max rpm?? or maybe i'm wrong here, the strange about this problem is that the engine revs up to max with no gas. You are correct about the one way bearing on the second spur gear that it may slip. But the engine shouldn't rev to max because of slipping one way bearing and clutch.
When the engine are at max rpm I don't want it to engage the drive line, if it do that at that rpm I think I will blow my gearbox so when this happens I rush to truck to cut it of.

Thanks for your respond and I will test them next time it happens.

ok i thought you meant it revved up to max rpm when you were trying to get it to go but it just sat there, didnt realize you meant it starts revving on its own. i really dont know what to tell you about that. when the truck is running fine how is the idle, does it try to move the truck? just wondering if its set alittle high and then when something fails and theres no load on the engine it starts to rev really high, other than that all i can think of is you say it just revs out, is there something wrong with the trans/receiver? maybe its glitching? the gear shifter ( for reverse) if put right smackin the middle would cause the truck to act like its in neutral, i was just wondering if maybe somethigns going wrong with your receiver pack and its pegging the throttle and putting the shift servo in neutral. i guess thats a long shot for something like that to happen, maybe someone else might know better.

Thanks for the respond paedbo.

Idle is fine, when the engine is cold the idle is a bit high but not much ( the truck does not move), so when the engine reach correct temp I have a really good idle. The engine dosen't just rev up it revs up like crazy, like over reeving the engine with no load at all. I haven't reach that kind of rpm when i'm driving at full throttle. I have a futaba 3PM and I haven't had any glitching with it before so I don't think so.

I can try to describe it again.
let say you pinch the fuel line the engine starts to rev up and will die, but here it's keeps on reeving up it's like some thing is leaning out the fuel or something. but it only happens when i loose power to the drive line
I have a very wild guess here.
The air filter gets allot of snow on it and the snow melts to ice and the engine gets no air because it's allot of ice in the way. But if it's not getting any air it would rater lower the rpm instead of raise the rpm.
No it can be it.

I'm open for suggestions

Thanks for all help paedbo. If you or anybody else has a suggestion please feel free to give me a replay.

i have a 3pm also and i think it glitches more than the original genesis radio pack, ( i think maybe its because i tried to use the cen failsafe with the futaba set up) ill have to remove it to see what happens, dont want to buy a new one yet until i can get my hands on that venom smart temp.

See heres the main problem

you seem to have two issues that are hard to put together,

1. engine revs and wont return to idle under your control.

2. no power to driveline,


now what issue, could possibly cause both these things to happen? ,

1. ok bad one way bearing, but then why does the engine rev, why cant you control it,

2. engine leans out for some reason, but then why does the driveline lose power?

This is why i had come to the assumption it might be electrical problem.


I guess what i would do is next time it happens cut off the engine since its revving like crazy, then immediatly start turning the pinion gear to see if it does move the truck, at least so i could narrow it down to individual components,

I'll will try all that, this weekend I don't have any time right now. Thanks for all the help and for all the fast replays.
Sorry to hear that you have problems with your Futaba 3PM I don't have any glitching and I use the stock fail safe. But I'll be checking all electronic this weekend and the one way bearing on the second spur .

Thanks
// Jadda

Dont drive it in the snow lol, not good running them in cold, and the snow melts and turns to water and messes with stuff and F**ks up your electrical stuff

PAEDBO.. you online...?

READ THIS AND HELP ME OUT MAN...!

I'm Shah

http://www.rcuniverse.com/forum/m_22...tm.htm#2733858

thanks