Inertia switch for PI fuel cutoff

[JimB]

Hello!

Has anyone got one spare, please? The one in my PI has seen better days and I'd rather not have to swap it out for a modern solution.

Thanks

[kevinw]

Several years ago, I hunted high and low to find a replacement for the inertia switch on my TR6. The one fitted was cosmetically clean, but intermittent in operation, despite being cleaned. Eventually, I was able to locate a replacement from a trader on ebay who dealt in Stag parts (I don't know why a Stag should have an inertia switch, but apparently it did). I was advised that these switches are even rarer than rocking horse droppings and were a little used part even when in production with the last production vehicle to use this design being early injected Ford Sierras.

An alternative maybe is to hide a modern inertia switch somewhere and keep the original as a cosmetic part. I ran mine for a short while with no inertia switch, but didn't like doing so.

Kevin

[Jonathan Lewis]

Hi Jim,

If the usual Triumph sources can't help, there is a very similar (perhaps identical) unit used on early Jaguar XJ12 and XJ-S EFI installations. Jaguar p/n C41220, and s/h units apparently available via E-bay. Be careful, though, as both Rimmers and Moss (and probably others as well) use a variation of the same part number for a modern alternative.

Hope this helps.

Regards,

Jonathan

[Mike Stevens]

The Stag uses the same switch as it has an electric fuel pump, unlike the mechanical one on the big saloons.

Jim, you can easily take them apart and clean them. The important bit is the brass (copper?) band around the plunger and the contacts below. My current PI kept cutting out due to fuel pressure drop but a clean of the contacts restored running and it hasn't gone wrong since.

Am I now going to regret saying that?

Cheers,
Mike.

[CAR]

Everytime I open the pi bonnet I give the cut off switch a quick pull up and down. Keeps the contacts clean.
As Mike says they are fairly simple inside and usually easy to clean.

Colin

[TedTaylor]

There is an item in the Service Notes about this.

MUT