Maestro Turbo Oil Pressure Switch

[Sussex Pete]

Can some please point me in the right direction for a supplier for the correct type of normally open oil pressure switch used on Turbo's. Mine has decided to leak through the body, not round the threads, so its not a case of just tightening it up a little more!

[Andy]

Good luck. I ordered a few this year which I thought and was told where the correct ones but weren't. John very kindly send me out a used one which is working spot on (for the few miles I have used it this year ha) If you find one that does actually work could you post up here please as I would like a spare I can trust to work. Cheers Andy

http://maestro.org.uk/forums/forum/t...-maestro-turbo

[Sussex Pete]

Hopefully for final clarification, the oil pressure switch for use on the Maestro and Montego Turbo engines is Intermotor 50670 or Unipart GPS134 (which supercedes GPS129).

Looks like I was a bit lucky with my 'bay purchases yesterday, as I had selected a GPS192 part, but the seller confirmed this morning that he can't find them and so has returned my payment. As it turns out to have been the wrong one, I'm not that fussed!

[mgdavid]

Pete, googling that Intermotor reference finds several on ebay from a fiver upwards....

[Doctordiesel77]

There is a way around this, if it ever becomes an insoluble problem. Get a standard 12v changeover relay, connect one side of the coil to an ignition feed, the other side to the oil pressure switch. Connect the common to earth and the oil pressure switch to the normally closed contact. Ignition on, no oil pressure with a normal nc switch, coil is energised, and wire that used to go to switch is not connected to earth, when oil pressure switch opens, relay is de-energised and wire is earthed via the nc contacts. With this modification you can use any sort of switch, if you get the correct switch, just move wire from nc side, to no side, or reattach it to the switch. Not as good as the correct switch, but it saves any hassle with incorrect switches.

[Jeff Turbo]

Read the last part of Andys thread. Wilcox had 12 in stock at the time and I also put the correct part number on it as your part numbers are not correct pete. GPS136 is the correct part number so I don't know where you're getting those from. Buy from wilcox , not ebay and you'll get the correct part. Btw I've also told you the part number before when you asked so also refer to that thread when the car had crank sensor problems.

[Sussex Pete]

Read the last part of Andys thread. Wilcox had 12 in stock at the time and I also put the correct part number on it as your part numbers are not correct pete. GPS136 is the correct part number so I don't know where you're getting those from. Buy from wilcox , not ebay and you'll get the correct part. Btw I've also told you the part number before when you asked so also refer to that thread when the car had crank sensor problems.

Jeff, I got the part numbers from the EPC using the Metro as the source, as the Montego information for the turbo, I think, is suspect. Looking at that again, GPS136 is shown as being for 2.0 carb engines with A/C on the Montego and is a supercession of GPS134. On the Maestro there is a supersession from GPS 132, to GPS134 and GPS 136 for 1600's with electric fuel pumps. On the Metro turbo which uses the same N/O switch the parts numbers are GPS129-132-134. On that basis I could assume that as 134 is superceded by 136 then either is OK. Just bothered about the engine specs that they were recorded against for Montys and Maestros.

[Jeff Turbo]

As per one of your old threads pete

[Sussex Pete]

As per one of your old threads pete

Damn! I did a search for any previous threads and didn't find that one, hence my new question.

Also new O/P switch (intermotor one) arrived today. Did test before fitting and its a normally closed one, even though advertised as for MG Metro Turbo, so its going back. Just about to phone Wilcox as you suggested.

[Doctordiesel77]

I seem to remember the epc and microfiche containing a variety of misinformation on turbo oil pressure switches...

[ian drew]

Pete, if you go get one and it's the correct one could you let me know exactly what you ordered as I think having a spare wouldn't be a bad idea!
Cheers,
Ian

[Sussex Pete]

Pete, if you go get one and it's the correct one could you let me know exactly what you ordered as I think having a spare wouldn't be a bad idea!
Cheers,
Ian

I eventually got one from Wilcox, as per Jeff's prompting. The Intermotor one from ebay turned out to be the wrong one as well, so got returned as an incorrect description. If you can bear with me until next weekend as that will be the first time I shall be starting the engine again after fitting. Car is currently garaged and under wraps while I try and make some progress on my daughters Mini, my Allegro Equipe and an engine rebuilt for a mates Cavalier track car!

[ian drew]

Quite a collection of cars!
Do Wilcox have an on-line method of checking stock or is it just a case pf phoning them up with a part number each time?
Cheers,
Ian

[Sussex Pete]

You just need to phone them Ian. John Wilcox in spares is a very friendly and knowledgeable guy.