oil pressure switch interchangeability

[sydgross 0]

I have a bad oil sentry pressure switch on my '86 417-A. I can't find an original pn for it. Can anyone direct me to an interchangeable part?

[BOWTIE 226]

HELLO, CAN YOU SEND ME PICTURE OF SWITCH? WHAT DO MEAN BY THE PIN IS THAT THE ELECTRICAL CONNECTOR. I CAN USUALLY COME UP WITH COMMON REPLACEMENT. THANKS

BOWTIE@COLUMBUS.RR.COM

BOWTIE IN OHIO

[tunahead72 2,543]

I think sydgross meant pn, as in part number.

[sydgross 0]

Part number is correct. The part appears to be nothing more than an oil pressure switch like those on automotive engines. It threads into the engine case with a 1/16" NPT. I have seen Kohler oil sentry parts for different engines listed at $42 which breaks down to about $10 for the part and $30 for the OEM name.

[bowtieguy 334]

Back in 07, I bought a 417-A at an auction....engine would not run so I thought it was probably a fuel problem....got it home and discovered that someone has replaced the oil pressure switch with an automotive pressure switch...AND the wire going to it was NOT connected. I connected the wire and oil light came on and stayed on....not good...engine would turn over but not run...so I figured I just blew a bunch of money on a junk engine. At the time I was not aware that this series II engine carried high oil pressure.

Not knowing exactly what to do, I ordered a Kohler oil switch from my Toro dealer...removed the automotive switch and installed the Kohler switch....engine started, red oil light went off ....wow, sweet running engine!

Short of story....made me a believer to use OEM parts once in a while (like using the correct WH belts instead of cheap aftermarket belts).

I can not verify that Toro sold me the correct switch....but here is the P/N as marked on the invoice (and Kohler package)....25 099 27-S ...invoice price was 7.76 each

[sydgross 0]

Thank you bowtieguy, that is exactly what I was looking for and the price is in keeping with the market. I agree with you, on many OEM parts there is no substituting without compromising quality. However, I have competed with OEMs for most of my life in the turbomachinery market. Without competition, their prices for spare parts can be obscene.

[KC9KAS 4,744]

Without competition, their prices for spare parts can be obscene.

Yes, a little competition keeps everyone "honest" on their prices.

[BOWTIE 226]

HELLO, I SEE YOU GOT A LOT OF SUGGESTION. IF YOU GO WITH THE AUTOMOTIVE SWITCH PART NUMBER IS (PS15) STANDARD MOTOR PRODUCTS. IT IS A COMMON SWITCH FOR INLINE 6 CYLINDER CHEVY'S FROM THE 60'S-70'S. A 250 CUBIC INCH. I USED ONE IN MY 1999 CH14S KOHLER. THE SWITCH TURNS OFF THE LIGHT AT 3-7 PSI. THE THREADS IS 1/8" NPT GOOD LUCK

BOWTIE IN COLUMBUS

[bowtieguy 334]

But remember, the series II engine on a 417-A carries about 35 psi oil pressure. (I think I'm correct with that statement)....I thought I was wrong one time but I was mistaken!!

[BOWTIE 226]

Bowtieguy, I don't know what kind of pressure my 1999 CH14S carries. The switch I used was for automutive use. So it can handle pressure up 60 or so pounds. I have never heard of 1/16" national pipe thread on a oil switch.

Bowtie in Ohio

[sydgross 0]

You are correct about the sensor NPT, it is 1/8". The block is drilled and tapped to 1/16" and has a reducer installed to go from 1/8 to 1/16". Thank you all for your responses. They have been helpful and informative.