Engine troubles

[djdoug99]

Ok I got the clutch bell to spin when I pull the throttle. Now another problem. The spur gear spins but the wheels dont move. But if I roll the car on the ground the spur gear moves with the tires. Any Ideas?

 

[HeartBreak]

Loose slipper? Or perhaps a loose diff? Or maybe a missing drive pin? Hold the spur and try to roll the truck; that will help you chase down what is slipping.

 

[Rolex]

Can you rotate the clutch bell by hand? If you can't, then the problem is in the trans or power train. If you can rotate, and the car moves, then you still have a problem with the clutch shoes.

 

[djdoug99]

I held the spur and rolled the truck and the wheels rolled normally.

I did another test that was in the manual and diagnosed it as a loose differential. It described how to do it but was still a little confused.

 

[SkyMaxx]

Is the flywheel that the clutch shoes attach to moving?

Also, I noticed that you were discussing a similar issue regarding the clutch and spur in a different thread within the stadium truck section. Are these the same problem or two different engines on two different RCs with very similar issues?

 

[HeartBreak]

A loose diff isn't all that bad to deal with. The only thing you have to worry about is if you wore flat spots on the balls. You can tell that by a gritty feeling once the diff is tightened to specs.

 

[djdoug99]

do you know the best way to get to the differential adjust screw? It says place an allen wrench through both the slot in the outdrive and screw. Which will lock the differential screw and outdrive together.

I think it is on the oposite side of the top shaft, but to get to it I have to remove the brake rotor so I don't think that is it.

 

[Z400]

Just got done putting together a kit and put an os engine in with a pullstart. I got it to start but something is screwed up with the gear on the crankshaft. It wont spin when I pull the throttle, but I can see the flywheel spinning, any ideas?

wait...you just put this together. and your ALREADY yanking the throttle?


even think about a break in?:read:

 

[djdoug99]

I read that a good break in procedure is to actually drive it around keeping low on the throttle. Just heat cycle it. Instead of the idle method.

Is the flywheel that the clutch shoes attach to moving?

Also, I noticed that you were discussing a similar issue regarding the clutch and spur in a different thread within the stadium truck section. Are these the same problem or two different engines on two different RCs with very similar issues?

yes this is the same truck and engine, thought I would post it in the main forums to get some others opinions. As of right now I did get the clutch bell to move (I ended up taking it out and lightly sanding the shoe).

Now however it seems as though the diff is loose and I'm havign trouble locating the adjustment screw.

 

[SkyMaxx]

...
yes this is the same truck and engine, thought I would post it in the main forums to get some others opinions. ...

That might be a good tactic; however, two threads on the same topic just takes up space in two sections and could quite possibly have two or three guys giving conflicting advice which would only confuse the issue.

I am going to merge these two threads and leave it here in the general section so it will get the maximum exposure. Also, note, your other discussion is taking place in someone else's thread (this is known as hijacking a thread or derailing it...)

Since there are already two very smart fellas working this with you, I am going to pitch out of the discussion and let them get you running.

Take it easy and good luck with the problem.

-SkyMaxx

 

[HeartBreak]

do you know the best way to get to the differential adjust screw? It says place an allen wrench through both the slot in the outdrive and screw. Which will lock the differential screw and outdrive together.

I think it is on the oposite side of the top shaft, but to get to it I have to remove the brake rotor so I don't think that is it.

Yup, this is pretty much the correct procedure. You have to align the slot on the head of the screw and hold it in alignment with the outdrive as you turn the other wheel.

 

[djdoug99]

so when you say outdrive, that is what the tbone shaft is connected to? So do I disconnect the T-Bone shaft to get a screw in there?

 

[beason]

yes you have to pop the "dogbone" out. the screw is inside the cup on the trans.

 

[djdoug99]

ok I got the differential tightened, how will I know when I got it right? When I turn one wheel the other wheel starts to turn right after. I also tightened it down until the wheels spinned together, then loosened it.

Another thing, when my manual says left rear wheel and right rear wheel, is that from looking at the truck from the front or back?

 

[Rolex]

As if you were sitting in the car. From the rear. Same as a 1:1 car.

 

[beason]

it needs to be pretty snug, hold one wheel and try to turn the other, it should spin smoothy but have resistance.

 

[djdoug99]

the manual says the slipper spring should be able to rotate if I hold the right wheel and spur while I spin the left. It doesn't. No matter how tight the diff is and loose the spring is the slipper spring will not rotate?

 

[Rolex]

Do you have a track anywhere in your town or county? If so, stop by and ask someone there to check it out for you. There are ALWAYS helpful people in the hobby who will guide you.

 

[HeartBreak]

Rolex nailed it on the head; the Losi diffs' can be a pain in the rear end (no pun intended) to adjust properly until you gain a feel for them.

In general, you want to tighten it all the way, and back out a set-amount. The average is about 1/16th of a turn.

 

[djdoug99]

thanks guys. ill probably go in the next couple days.

One last newb question, what does it mean when the slipper slips and the diff slips?

Thanks again for your advice and patience.