Water temp sending unit

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Water temp sending unit

Postby Berger » Tue Nov 12, 2019 11:54 am

Hi All I broke the tab off my SW temp sender that screws into the expansion tank. Brian at AD said the new ones will not read the same as the old ones so does anybody have one for sale?
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Re: Water temp sending unit

Postby Richard Werner » Tue Nov 12, 2019 1:25 pm

Can you solder a wire on the remaining exposed metal and put a push on connector on the end of the wire?
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Re: Water temp sending unit

Postby Berger » Tue Nov 12, 2019 4:23 pm

I'm going to try
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Re: Water temp sending unit

Postby Bob Lowe » Tue Nov 12, 2019 8:04 pm

Try an auto parts store or tractor shop. Take the old one in with you.
Good luck,
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Re: Water temp sending unit

Postby boatalec » Thu Nov 14, 2019 2:42 pm

when you get the new sender, install it into the engine block instead of the expansion tank. There is a bolt in that spot waiting for it. If you have low water in the engine it will become low in the expansion tank exposing to air the sender, you will never know if it over heats. A critical issue with a diesel engine.
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Re: Water temp sending unit

Postby Berger » Thu Nov 14, 2019 3:01 pm

One of our own, Chesapeake is graciously sending one to me. Thanks Chesapeake
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Re: Water temp sending unit

Postby Joker » Tue Nov 19, 2019 7:29 am

Hi all

Just be aware that the unit that is screwed into the expansion tank on a Lehmann SP 135, is the “cold start switch,” that controls the “excess fuel solenoid.”

The temp. sender, and the temp switch that triggers the high temp. alarm, are positioned at the top of the block, close to the expansion tank.
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