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Wendell,

I'd try the one I referenced from Autometer, whose whole business is after-market gauges. JC Whitney, which is out here in Illinois, maybe a 90 minutes drive from me, is a dicey supplier. I've had my own fights about non-airplane-part with them. They frankly don't know what the heck they have, so trying to get info from their clerks is just impossible. And what they ship you might be different than what's in the catalog. It's inexpensive but it's a pig in a poke. But I digress...

I think "BSPT" is an abbreviation for British Standard Pipe Thread, which is different than the American NPT or National Pipe Thread.

Barry

----- Original Message -----

From: Wendell Voto

To: Rotary motors in aircraft

Sent: Sunday, April 02, 2006 11:33 PM

Subject: [FlyRotary] Re: Oil pressure port size

I ordered an adapter (10.0x1) from ACS. This is the size I got off this list as to what is needed for the oil pressure gauge post. Well... it doesn't fit, the threads are finer on the oil pressure gauge sender unit. Sooo.. what is the real thread size for the Oil pressure gauge port on the 13B? What is a good source for an adapter to go from the oil pressure port to pipe thread?

Wendell

Hi Wendell,

Sorry if I'm the one that steered you wrong on this. I have a note that M10x1.0 fits, and I'm sure it did fit the ones I've tried. There was at least one other case where one of my noted sized didn't fit someone else's housing, so it's possible they do change from one year to the next.

Just to be sure, are you talking about the actual threaded hole in the rear housing? Seems I recall that the stock arrangement used a straight fitting that extended out from the housing to the sender. If I'm remembering that correctly, then the sender could be different from the threaded hole in the housing.

Good luck,

Rusty (just back from a family reunion)

Rusty, I'll let you take the blame.

The oil pressure sending unit on my '87 13B appears to be 10x something. The adapter diameter is right but threads are too course on the purchased adapter. Barry mentions a 1/8 BSPT which I have never heard of (haven't heard of a lot of things). I went to JC Whitney site and they show a 1/8x28 BSP adapter. Barry,is this what you're referring to?

The port for the temp sensor just forward of the oil pressure sensor port on my engine is smaller than the oil pressure port and I have no idea what it is, but am going to use the original temp sending unit case, drilled out to accept my solid state sensor in this location.

It might be better to get an original Mazda oil pressure sending unit (original one seeps oil) to fill the hole and use a gauge that will be compatible with it and get oil for the re-drive from some other source. Does anyone know if the Mazda sending unit is compatible with after market gauges?

Could try getting kit from JCW and see if any will work. Already wasted more on the one from ACS.

Wendell

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