| Greg,
It's the ball bearing / plunger / spring at the OD hydraulic pump.  See the 
picture at the start of Part 2 - 
http://www.team.net/www/healey/tech/big_hly/od/delborder_od.html
Have you hooked up a pressure gauge to the OD yet?
Bob
Greg Lemon wrote:
> 
> Anyway I read a good article about the hydraulic part of the O/D that talks 
> about weak non return valve springs being a likely  fix for low pressure. 
> However neither the article http://www.ntahc.org/techtips/OVERDRIVE1.html 
> nor my factory workshop manual identifies this part.  Can anybody help point 
> this part out and can it be removed, service, withought completely 
> dismanteling the O/D?  That and any other thoughts on the problem are 
> welcome, still hoping it is electrical, but that hope is dwindling as I test 
> and diagnose.
> 
> Greg Lemon
> 54 BN1
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