Author Topic: `51 gearbox  (Read 953 times)

Offline jimmy

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`51 gearbox
« on: 23.01. 2010 11:50 »
G`day, the gearbox on my `51 has no oilseal on the output shaft, it has a steel plate that is a close fit to the sprocket boss, it appears to be original. Does this type leak oil, or should fit a plate with a real seal on it?
regards Jim
1961 Shooting Star on the road   1951 Golden Flash on the bench

Offline muskrat

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Re: `51 gearbox
« Reply #1 on: 23.01. 2010 20:04 »
G'day Jimmy,
                 They do leak a bit. the original sprockets had a spiral groove in the boss to work the oil back in.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline trevinoz

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Re: `51 gearbox
« Reply #2 on: 24.01. 2010 06:20 »
Jimmy,
             As Muskrat says. If your sprocket is worn out, replace it with the later type and fit an oil seal.
Trev

Offline jimmy

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Re: `51 gearbox
« Reply #3 on: 24.01. 2010 10:44 »
Thanks Muskrat and Trev, my sprocket doesn`t have the reverse scroll which tricked me,so I`ll do as you say, regards Jim
1961 Shooting Star on the road   1951 Golden Flash on the bench

Offline BSA_54A10

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Re: `51 gearbox
« Reply #4 on: 24.01. 2010 11:54 »
The 2 different sprockets are also different sizes, the latter oil seal type being slightly bigger than the early oil slinger type so you will know if it is wrong as the sprocket will be too tight in the box
Bike Beesa
Trevor