The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Gearbox, Clutch, Primary => Topic started by: a101960 on 21.08. 2017 16:57

Title: Gearbox plunger thread
Post by: a101960 on 21.08. 2017 16:57

Can anyone tell me what the gearbox case plunger thread size is please? I need to buy a tap to give it a clean up. The plunger was quite tight when I unscrewed it and it does not want to screw all the way back in.
John

Title: Re: Gearbox plunger thread
Post by: JulianS on 21.08. 2017 18:39

It is 5/8 inch x 20 tpi cycle thread.

Title: Re: Gearbox plunger thread
Post by: a101960 on 21.08. 2017 19:32

Thanks for your help Julian. I must say the taps took a bit of tracking down. The obvious vendor Tracey Tools didn't have any in stock. I managed to order a set from RGD Tools. Once again thanks for your help mate.
John

Title: Re: Gearbox plunger thread
Post by: a101960 on 23.08. 2017 15:36

Julian, the taps arrived in the post this morning. I ran a tap throught the plunger hole and the thread cleaned up nicely, so the plunger is back in the box now. Once again thanks for the heads up on the thread size.
John