High water temperature sensor

[Jon Schneider]

Ah, okay, I thought I vaguely recognized the number.  I ordered that part last year with the same result (just the one hole).  Guess I'll go the drill-n-tap method.  Now, at least when I screw up, I'll have a back up ;)

[Steve W10]

Sorry to bring up an older thread, but the topic is just about right.

Does anyone know of an appropriate Temperature Switch? (I'll be drilling and tapping my older Thermostat Housing and would like to keep the hole as small as I can)

I've seen some automotive applications such as "Auto Meter" for about $20, but they look wide and shallow.

The Cole Hersee switch and/or kit has a 3/8" thread. http://www.colehersee.com/home/item/cat/225/84251/

Westerbeke's  30125 seems perfect with the 1/8" thread.  But I was a little surprised at the cost from Toressens $49, and even more here in Canada $67.

Also, I've never tapped NPT (tapered) before, guess I need to get me an NPT tap., I've only got NPS.

Suggestions?

Steve

[Rick Johnson]

Steve,

I'm in the same situation and really feel $50 for the switch is out of line.  Since the switch is only open or closed, I don't see why you could not use the Cole Hersee 84251 ($15).  I may go ahead and wire it up and see what happens.  I've been talking to Seaward Products so I'll try to run it past them also.

Cheers,

Rick

[Ken Juul]

As you said it is just an on/off switch.  check with your local auto parts store...with a little research you should be able to find one that works at the appropriate temp.  Might beat the Cole Hersee price.

[Steve W10]

A quick check on outside diameter of these NPT fittings shows that for 1/8" NPT, the OD is .405" and for the Cole Hersee 84251, 3/8" -18 thread it would be .675".  That's a pretty big hole!
http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html

I'll go by my auto parts shop and see what the guys can come up with, but it seems now-a-days they want a model and year for their parts look-up.

Will advise.

[Stu Jackson]

Steve, I hear ya about parts lookups these days in auto stores.  We have two kinds of auto stores around here:  the big box Kragen/Napas of the world, and still one or two "family owned" or smaller chains that actually have guys behind the counter who know something about real parts.  I buy my filters at Napa, and use the smaller, knowledgeable guys for the more interesting parts sourcing.  Jamestown and McMaster Carr are reported to have a wealth of "stuff," too.

[Rick Johnson]

Steve,

Thanks, I totally missed the size difference and would have been surprised when it showed up.  Now I'm have trouble finding a 1/8" npt temperature switch. I might be stuck ordering the $50 part.

Cheers,

Rick

[Steve W10]

Hey Rick, I did find a few other suppliers in the US that you could consider.  Unfortunately some won't ship to the great white north.

The one for $25 almost seems too good to be true; not sure if it is a trusted source.  They won't ship to Canada, but it may work for you.

Torresen's $49 + $1 connector + $2 isolator + Shipping.
http://shop.torresen.com/ships_store/?p=details&ident=144022&mfc=Westerbeke&sku=30125&prod_name=Temperature+Switch&sectionid=Westerbeke%20Parts

Ace Marine Diesel $44.80 plus...   (may only ship UPS)
http://www.acemarinediesel.com/westerbeke-temp-switch-30125-p-91.html

Conanicut Marine online chandlery has it for $25.00 Ships to USA only!
http://www.conanicutmarina.com/online-chandlery/engine-shop/westerbeke-parts/westerbeke-alarm-sender-30125.html

Discount Marine Source in Michigan has it for $44.80
http://www.discountmarinesource.com/p-2353-westerbeke-switch-temperature-030125.aspx

http://www.clrmarine.com/ sells for $44.80, but their distributor uses only UPS, however, email with Chuck and he can make it work by having their distributor mail it USPS.

Good luck, oh and if my hint about an NPT tap wasn't too obvious it's something you'll need otherwise the effective threads will be limited to only a few.  Although there's only what ,13 PSI in the system, may as well do it right.

By the way my parts guys couldn't come up with anything, so I'll likely order from clrmarine.

S