O-ring sizes for 4 speed transmissions
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
There is one O-ring used with the 4 speed transmissions: the O-ring for sealing the outer body of the throw out bearing assembly to the rear cover. There are two variations: one for 20 mm diameter outer bodies (early transmissions) and one for 22 mm diameter outer bodies (later transmissions).
O-ring to fit 20 mm diameter outer bodies
These measurements were made to the best of my ability (I do not know the original specification).
- O-ring for the 20 mm diameter outer body of the throw out bearing assembly (MG# 90706150): 15.3 mm ID × 2.4 mm wide
- 0.549 inch ± 0.007 inch ID × 0.755 inch OD × 0.103 inch cross-section. Nominal dimensions are 9⁄16 inch ID × 3⁄4 inch OD × 3⁄32 inch cross-section.
O-ring to fit 22 mm diameter outer bodies
These measurements are accurate to the original specifications.
- O-ring for the 22 mm diameter outer body of the throw out bearing assembly (MG# 90706170; OR 3068): 17.13 mm ID × 2.62 mm wide