the new one on the right is available from SNGB. any one installed one? comments, criticisms.

 

Looks exactly like my overdrive solenoid. Maybe interchangeable? Mine works just fine. Maybe rod lengths & treatment vary?

 

My first aftermarket solenoid like this lasted about 2 years. I was told by the font of all knowledge on the DG gearbox - Graham Whitehouse of :: G. Whitehouse Autos Ltd :: - that correctly adjusting the length of the rod is crucial to their long life. And in order to do that properly, the rear extension has to be removed. So, I'm hoping for a bit longer from my second aftermarket one fitted last year. All that said, apparently, these aftermarket items are never likely to last as long as the original part.

I don't think they are interchangeable with the overdrive solenoid. They certainly have always had different part numbers.

 

Thanks Orlando, I know the P/N's have always been different but when I look at the internet they seem to be offered interchangeably today. Which made me wonder about their respective activation & holding current draw.

Overdrive solenoid:

 

Ah. I'd not noticed that. The Lucas part number for the speed hold solenoid is 76533 and I've not seen anyone offering a new item that covers that part number and the O/D solenoid (76517, 76522). Then again, the difference may just be the rod.

 

I'm sure your expert Graham Whitehouse warns of correct adjustment because if the solenoid does not move from it's initial high current (activation) phase to a much lower holding current phase it will ultimately burn out the main solenoid winding.

e.g. in overdrive application

Holding Current = 1 to 1.5 amps
Activation Current = 18 to 20 amps.

 

Yes, exactly that.