Tip – Refitting MGB Overdrive

Sounds a complicated procedure but it does the job.

MGB tips mods and maintenance

The Haynes manual simply says to refit as removal which is absolutely useless. It is a right swine to refit if you don’t know the trick.

  1. There is a cam collar mounted on the main shaft to drive the overdrive unit pump. Be careful when you remove it as there is a small ball bearing mounted in the shaft. If it falls out it will drop down into the gear box!! Same when refitting wrap and pack some rags around the base of the shaft in case the ball bearing drops out.
  2. When refitting make sure the splines inside the unit are aligned before lowering it onto the gearbox. The lower set inside the unit will rotate – i found the head of a spanner fitted well into the splines to turn. Afterwards do not turn the prop drive flange whilst handling or the splines will misalign.
  3. Fit a cord…

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