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MG MGB Technical - Gearbox shims

When removing the gearbox 1st motion shaft cover plate, to renew the oil seal, the circular shim around the end of the bearing had worn away so only fragments of it were left.
How do I determine what thickness of shim I replace it with, as these come in different thicknesses and it said to replace as required.
Thanks Trev
Trevor Harvey

read the manual!
Chris at Octarine Services

The manual I have does not mention them.
Trevor Harvey

Both the Leyland and Haynes manuals cover it -"Measure A the depth of the bearing register (recess) in the front cover and add .012 to represent the compressed gasket. Measure B how much the first motion shaft bearing protrudes from the casing. Fit shims to make B .000 to .001 greater than A." .002 (6K778) and .004 (6K779) shims are mentioned, several of the usual suspects seem to stock them, although the larger one is .005 which makes more sense in getting .000 to .001 than .002 and .004 shims do.
P Hunt

Go to Chris's website and download his 'MGB 4 synchro overdrive gearbox servicing guide". Excellent shorthand list of what to do and how to do it. The Haynes manual says much the same.
Richard Coombs

I have created a DVD for the MGA / MGB 3 Synchro Gearbox Rebuild. Please visit my web site for details at http://PrimeHawkInnovations.com
CM Merenuk

This thread was discussed between 02/01/2010 and 08/01/2010

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