thrust washers and overdrive

[J81293@aol.com]

I am somewhat new to the triumph world so can someone please explain to me
the importance of the thrust washer, what it does and what to look for that
indicates the need for replacement.

Next, am I correct in my assumption that when you switch to overdrive you
should enage the clutch.

Thanks for the help

Jeff Horowitz 
1976 TR6