Chirping XX4

[markwilliamson2001]

Hey guys,

took my car down for a shakedown test at the weekend. Ran the car with a brushless in it, but I could not make it stop making chirping noises under hard acceleration and generally while running.

I checked out both the rear diff and slipper clutch as per the manual, setting them correctly, so that the slipper clutch went before the diff, and that the diff was tight enough. This didnt seem to cure the problem, so I thought it must be the rear belt. I then proceded to change the rear belt tension from A forwards to B forwards, as I thought the rear belt might be slipping...

Come the final, the car sounded awful. When I got home I found that the front layshaft had a lot of slop front and back to the point where the motor mesh was none existent.

Could this be the problem and if so, it seems like I need a new chassis or car because I single part will not sort this, because the main chassis molding holds the bearing for the front layshaft.

Any other ideas?

Mark

[Southwell]

You sure the layshaft isn't bent?

[markwilliamson2001]

No its not bent, there is a lot of slop on the slipper side where the bearing rests in the chassis. You can move it when the top cover is on for the side/rear belt and the front belt. It seemed loose when I was rebuilding the car after I bought it 2nd hand.

Thanks
Mark

[Southwell]

Did you take it apart and rebuild it when you got it? Might be something missing, i haven't heard of dodgy chassis on the part.

[super__dan]

I had this when I bought an old XX4 and ran it before converting to the X5. I bodged it by super gluing a peice of card onto the top deck(?) bearing face to remove some of the play. It really was a pain and I wasn't happy with the bodge but it was either the chassis or top deck, or both which is big £££. It did work though I only ever ran it for 3 meetings before converting so not sure how long it would last.

[markwilliamson2001]

Yeah, big bucks for a new car/chassis, but I am tempted by a new car, then I would have a whole car for spare parts....

I did rebuild the entire transmission and everything seemed to run true and freely, apart from this slip around the front bearing on the front layshaft.

Thanks guys

Mark

[Fiddybux]

Forgive my ignorance...but might this be a cogging issue with the brushless? You're not running a sensored motor with a sensorless ESC (or vice versa) are you?

I might be wrong about any or all of this - just thought I'd try and help.

[_sleigh_]

I suspect you've check this Mark, but it's not just a collapsed bearing??

If you're at the 2WD regional this weekend at Kiddy, I'll have a look if that helps.

[Southwell]

Alec Springer had a similar problem with his brushless yesterday, turned out to be a dodgy motor. Seemed like a bearing failure.