Problems with my DB01R

[muratti]

Hey guys!

I have a problem with my DB01R and badly need some advice.
After now about 70 7min. runs i heard a strange chattering when speeding up quickly. A racing mate said he thinks it´s the rear belt getting loose. So i thought after 70 runs it´s not unnormal to change the belt. So i changed the rear belt, rear pulley and both Center pulleys. I built everything as per manual and still have this strange sound. It even got worse so that full throttle is almost not possible. I changed the diffs, they didn´t get loose.
Is it possible that i have to change the front belt and pulley too but it definitly sounds as if it comes from the rear end although i am not 100% sure as i can´t look at it while speeding up as there have to be the diff and center covers on to try out.
I simply don´t know what causes this chattering. It sound like a belt rolling over the pulley...
Please help!

[muratti]

Oh i forgot to say i tried to make the rear belt one dot tighter than in the manual but the motor gets too hot and i don´t think it is ok tighten up like that.

[DCM]

you will have to make it a process of elimination to be honest, take the front belt off, try it, take the rear off, try it, if that makes no difference, take both belts off, if no different, check the spur and pinion for damage, also free rev the motor (no pinion on).

If you find taking one of the belts off, stops the noise, you know it is that side of the transmission that is causing the problem, so you will need to check the bearings (diff and hub) and the pins on the driveshafts to.

[muratti]

Oh i hoped i wouldn´t be that answer it already took several hours to take it apart and built it up again twice!
I let the motor turn without pinion, nothing strange.
So maybe it´s the front belt. I will try and leave the rear one out this time and see what happens.
Will take me some more hours i´m afraid :-(

[DCM]

shouldn't take to long to do fella

[Carno]

Check all the pins in the universal shafts. The wheel axle side ones tend to slide out if the small hex screw wasn't tightened enough.

I've also had the pin in the dogbone side come loose and slide out on one drive shaft that would make a really weird noise cause it only used one side of the outdrive.

#edit.

I've got to say that is one of the biggest downsides to the DB-01 for me.
Opening it up to get to the diffs.

[area52]

Originally Posted by muratti

I let the motor turn without pinion, nothing strange

Maybe some debris/sand in the teeth of the spur gear or pinion?

Just an idea.

Edit to self: Read ALL posts.

If the sound comes up with tightening the slipper clutch maybe there might be some unwanted stuff between the inner slipper plate and whatever comes next?

[discostu]

its not somthing silly like the magnet on your motor rotor come un glued and slipping on the shaft when the car is under load.

stu

[muratti]

No, sorry i reassembled the slipper 3 times, everything was done correct. It seems that maybe the motor makes this sound, as from what i read it could have lost power from getting too hot 2 or 3 times. Maybe the missing power causes the chattering under stress.
Will see tomorrow when the guy from the LHS takes a closer look.
Fredrik, i also thought about cutting off some of the material to have easier access but i race on dirt and thereofore can use every seal available on the chassis although i have already thought about building and racing my NIB 511 with your covers. I think this should work too!