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September 29th, 2008

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Q & A: Gearbox Oil Leak

Monday January 02nd, 2006
Q & A, MGA, MGB, MGC, MG T-Type, Midget
John,

I have a 1969 MGB with the original, nonoverdrive gearbox. My problem is that transmission oil leaks past the oil seal on the speedometer pinion gear shaft. I have replaced the oil seal several times, but to no avail. The pinion shaft appears to be in good condition with no visible damage, and the oil seal fit is good, but I cannot stop the leak. This is a particular problem since sources such as Moss Motors indicates that the speedometer pinion is an obsolete part. The right angle drive on the transmission has recently given up and I am suspecting it has plastic gears that have been ruined by the oil leakage. Have you run across this sort of thing before, and do you have any suggestions? Thanks so much for the service you provide to the MG hobby.

John
John!

Despite the fact that it's bathed in oil, the speedo pinion "never" leaks. That is to say, I simply cannot remember the last time I saw one leak! So, I would suggest that you change the housing altogether.
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