Mechanical tach drive assembly

[Healey Nut]

Does anyone have a parts drawing of the mechanical tach drive assembly for a BT7 Tri Carb .
I cant find one on any of the supplier sites .
im looking for the top oil seal and the tach drive spindle and gear . The one that goes in the side not the main cam gear .

 

[John Turney]

Are you looking for parts #118 and #125 on this page: https://mossmotors.com/austin-heale...rformance/internal/internal-engine-100-6-3000?

 

[Healey Nut]

Are you looking for parts #118 and #125 on this page: https://mossmotors.com/austin-heale...rformance/internal/internal-engine-100-6-3000?

Thats the ones , perfect tks

 

[Healey Nut]

Taking a second look at this , does anyone have a close up pic of the “thrust button “ that goes holds the pinion gear in thrust and also is the tach drive pinion gear the same as the speedo pinion gear on the the 100/6 gearboxes ? .

 

[British_Recovery]

Speedo pinions are not the same, and also vary between 22% and 28% overdrives.