Gear Box - Tight

[jo90]

Right, im rebuilding the car ready for sunday. I've built up the gear box in MM4 format. All the casing, bearings, shafts etc clean and all in 100% order (no dodgy bearings etc). Layshaft spacer is one of the new ones so its in 100% good nick too.

Put the gears in, along with a gear diff. Before closing the case up all the gears spin fine. close the two halves together and it is binding like mad to the point Im having to use reasonable force to turn the gearbox over from the diff outdrives. Take it apart, re-check gears all spin in both sides of the gearbox haves, put it together again, same thing.

I even removed the shims from either side of the 2 idler gears to create space, still same thing.

Has anyone else come across this at all ? Im wondering if the gearbox has warped somehow in a knock.

cheers

[discostu]

You broke it lol

[Kusal]

Had the same issue in the past.
No spacers on the gear diff.
Put the gear diff only in the gearbox and see if there a bit of backlash when pinching the gearbox together (with your fingers).
If that is not the issue, put all internals in, screw all screws in and loosen them up half a turn.

[Jordy]

It might be that you have tightened the screws on the gear diff too tight and warped it. Check the main gear and loosen the screws slightly.

Does it pinch on a section when you rotate it?

[/tobys]

Think the gear diff meshes a bit tighter to save the drive train from the extra stresses the gear diff puts on the rest of the gearbox. I have exactly the same (no shims). As already suggested, tighten up case screws as usual and then back off a fraction.

[jo90]

I have actually done the screws on the GD tight, i will try to back them off a bit and try again later once home incase i have warped the gear.

cheers guys