New KF build problem

[safk]

I have just finished building a KF but when I ran it up it didn't sound right and after investigation I have found that the shaft with the spur on it moves side to side about 1mm with the bearings also moving in the housing. It also wobbles a little which obviously makes the pinion spur mesh inconsistent. The shaft with the front pulley on it also has a similar amount of lateral movement. Am I missing something obvious here? Double checked the manual and it's assembled correctly.

[Whiskyshooter]

I this the sound more comes from the rear end. Push the arms up to around level and see if the noise is gone. I know my car makes noise but it's gone when I life the arms to running height. I think it's just the dog bone rubbing

[Adam F]

Sounds normal to me, there is some play.

[/tobys]

I had similar on mine and was reassured all was well. tried different bearings, no improvement. I ended up reducing the amount of play by removing the crush spacer from the layshaft (that sits between the 2 housings) and tightening the nut with the side gear on very carefully to ensure it didn't bind. I used a couple of washers between the side gear and nut after some trial and error and this took most of the slop away and resulted in much better/uniform gear mesh.

I wasn't sure if the problem was the crush space being too large, the chassis holes weren't quite right or if it was the housings that were not tight enough. I suspect that there are tolerances on all the parts and if you are unfortunate enough that you combine parts that are on the upper end of the tolerance scale, you can get issues like this.

I've had less of a problem with the LG chassis TBH but YMMV.

HTH

[DCM]

Crush spacer is to long, shorten it, that is what I did.

[safk]

Thanks for your thoughts gents.

When you initially apply the throttle it looks / sounds horrible as it appears that the pinion is trying to spit the spur gear out of mesh & I didn't want to strip the spur. Once it is all moving it is fine it's just the initial start up that appears to be the issue & trying to get the correct pinion/spur mesh