There is no earth for the reverse switch. You will see 12V on one side and 0V on the other. When the reverse switch is activated 12V will flow from one terminal to the other. That is how the other rotary gearboxes work. I'd imagine your one will be no different.
When I tested my reverse lamps last update I jumpered between the 2 terminals to simulate the reverse switch until I complete the wiring to the gearbox. Make sense, the switch completes the 12V circuit ?
So, no the green wire will carry 12V when switch is in the on position. Colour coding looks the same as Rx3.
Ah. That makes sense. I thought that it was a switch with one colour denoting a path in and the other colour denoting a path out, with the gearbox earthed or something like that.
Hmmmm, from your pics and info collection:
1. Is the position for the clutch slave push rod the same for both forks?
2. Are both the throw-out bearings the same thickness - the 626 bearing looks thicker?
If the 626 bearing is thicker, would that then take the 929 retaining spring out of the equation.
Maybe the spring is just a way to give the old bearing positive location to the fork? Also, maybe
the missing fork return spring was to give the clutch pedal, feel?
3. From memory, the only difference between VC & MA clutches was the overall diameter
and possibly friction plate thickness, but i'll double check that tonight.
1. Yep. They are identical, the only difference is that there is more "meat" past the dimple for the clutch slave piston on the 929 fork.
Spac told me to be careful as apparently there is an early 626 clutch fork and a later clutch fork, but the ones I have are the same.
2. Yes, the 626 bearing is a lot thicker. One of the guys at work said to use the larger bearing as it would make clutch operation easier, but I don't want to damage the pressure plate with the wrong bearing. I think that the 626 bearing locator tabs are a lot more elegant and easier, but the spring holds the 929 bearing on to the fork a lot tighter.
Hmmmm, hadn't thought about the missing fork spring, interesting that the replacement clutch slave cylinder doesn't have the ring cast into it to mount the fork spring, the old one didn't either which makes me think that the old clutch slave was a replacement too.
I noticed that the old clutch slave didn't have an adjustable piston/rod, neither did the new one that I bought. However the 929 manual clearly shows how to adjust it....
3. In the Exedy book the clutches are the same size, same part number, but the pressure plate is different. Not sure why.
I nearly bought a complete MA and 5spd on the weekend but the wrecker wanted 250 for the gearbox alone so I passed.
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