R75 V8 Inhibitor Switch

[MarkVoisey]

Hi does anyone know if this is a ford or rover part as I’m struggling to find one?

[DeeJ]

Originally Posted by MarkVoisey

Hi does anyone know if this is a ford or rover part as I’m struggling to find one?

May I ask exactly what it is you are looking for and why?
Do you (think) it is the selector position sensor that prevents the engine cranking, other than when in P or N?
The fuel cut-off switch behind the glovebox maybe?
Maybe the immobiliser unit (the one that often gets water damage)?
Unless you really know for certain which, it's perhaps best to describe the symptoms you are having.

[MarkVoisey]

Hi when I put it in p sometimes when I go to start the car it won’t turn over so I put it in N then it starts and the AA man said it the inhibitor

[DeeJ]

Originally Posted by MarkVoisey

Hi when I put it in p sometimes when I go to start the car it won’t turn over so I put it in N then it starts and the AA man said it the inhibitor

He could be right then, but it could also be the linkage from the selector lever forward to the gearbox selector arm. That is simply a stainless M6 threaded rod with 10mm ball joint nylon sockets fitted at the ends, totalling about 18cm in length. The joints often seize, break or distort, which could prevent accurate selection of "P".
The Rover part is NLA (if it ever was available), but can be easily repaired by replacing the ball-joints:
https://www.sgs-engineering.com/b9-metal-ball-socket.

Generally, but not always, failing to start some of the time in "P" is a inhibitor switch problem; never starting in "P" is a selector rod mal-adjusted or damaged.
Inability to select any gear position, "N" or "P", is a broken ball joint, generally the one at the gearbox end of the threaded rod.

The inhibitor is a Ford part, and is actually called a "Neutral Safety Switch".
Ford Part-number MOTORCRAFT SW5713

https://www.rockauto.com/en/catalog/...ge+sensor,4584
https://www.rockauto.com/en/moreinfo...t=4584&jsn=942

This video is for a Ford F-150 truck, but it has a very similar gearbox to the Rover 75V8 (4R70W instead of 4R75W), and uses the same Neutral Safety Switch.
https://www.youtube.com/watch?v=zNG2G-51K0g

Lots more information over on the The Two Sixties, specifically for and by ZT260 and Rover 75V8 owners. You really should join; it will save you a bomb in the end. Did for me.

David