Prop vibration - again.

[paultv]

After sorting out my prop (incorrectly fitted together) the beast has been smooth and lovely for about a year - now I'm noticing vibration between 40 and 50 mph when under load - if I coast, out of gear at this speed, perfect, engage gear and accelerate, vibration returns. Smooth driving 60mph and above.

Any observations - I'm going to open it all up and inspect, but maybe someone has an idea where to go first - Guibo is 2 years old as is the center bearing - the balance issue I had before caused vibration regardless of load or being in gear at all, so I guess its not that.

Paul

[Brianmoooore]

Vibration in that range of speed is most likely caused by something rotating at the same speed as the wheels.

[paultv]

OK, I'll start at the back end.. also I read everywhere that when removing the gearbox output flange/guibo and prop that you should mark the prop front flange position, why is this? Surely the output flange/drive is balanced and so is the prop and so is the input to the diff at the other end - what could be out of balance if you re assemble it in a non original position? just wondering, surely not every transmission/prop/diff are balanced as a complete unit...or?

Paul

[Brianmoooore]

I read everywhere that when removing the gearbox output flange/guibo and prop that you should mark the prop front flange position

Just standard 'good practice', and as you surmise, total b****x.

[Stefan on probation]

When I had the guibo checked on my car years back it was found to be fitted back to front.

[paultv]

There is a lot of lateral movement on the NS half shaft, more than the OS and it "knocks" against the hub - what controls the half shaft float on the splines?

There's a short video here -

Paul

[paultv]

Turns out two of the three self locking nuts on the gearbox to guibo flange are no longer locking - not been replaced with new ones and had come loose - BAD!

Smooth as a babies bottom again.

Paul