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  #1  
Old 07-02-2003, 10:41 PM
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two temp sending units? 617 turbo

While I was pulling parts off a junker in a boneyard I noticed that it had two temp sensors. (300D) where mine (a bastard) has only one.

On the junker there was one on the back of the thermostat housing and one on the block behind the IP. Mine is using the one behind the block on the IP as the temp sensor. Is this water temp or oil temp being sensed at this port?

Also I noticed there are two areas around the thermostat housing where water temp sensors are installed on 617's. One area (like the junker 300D) is behind the thermostat and the other is on the face of the thermostat houseing. (I have a plugged port here but not one behind the thermostate)

why is there two in the first place and why the variety of locations for sensors around the thermostat ? In fact is that a third temp sensor next to the one in back of the thermostat that has pressure/vaccum?? lines going to it?

Thanks a mucho

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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels

Last edited by coachgeo; 07-02-2003 at 11:55 PM.
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  #2  
Old 07-02-2003, 10:46 PM
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Coolant temp sensor is behind the IP, the one on the thermostat housing is the 212F switch for the aux fan. Some are located in the upper hose side, some in the bypass, why I don't know.

If you don't have an electric fan, you won't have the temp switch.

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #3  
Old 07-02-2003, 10:47 PM
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Quote:
Originally posted by psfred
Coolant temp sensor is behind the IP, the one on the thermostat housing is the 212F switch for the aux fan. Some are located in the upper hose side, some in the bypass, why I don't know.

If you don't have an electric fan, you won't have the temp switch.

Peter
Make since... what about that third temp sensor? next to the one in back of the thermostat that has pressure/vaccum?? lines going to it?
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels
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  #4  
Old 07-02-2003, 10:49 PM
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Quote:
Originally posted by psfred
...
If you don't have an electric fan, you won't have the temp switch.

Peter
at what temp does this one switch....? I snagged the one off the 300D. Might be usefull once I found a way to add an aux. cooling ffan.
__________________
"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels
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  #5  
Old 07-02-2003, 10:54 PM
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The one with vac lines is probably a vac switch for the EGR.

Fan switch closes at 212F, you only need to add a relay to run the fan, don't try to switch directly, it will fry.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #6  
Old 07-02-2003, 10:57 PM
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Quote:
Originally posted by psfred
The one with vac lines is probably a vac switch for the EGR.

Fan switch closes at 212F, you only need to add a relay to run the fan, don't try to switch directly, it will fry.

Peter
Thanks thats perfect for me. What's the difference between a "relay switch" and a "solinoid switch" Just trying to learn all this
__________________
"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way".
by JerryBro


The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue

My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair

62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels
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  #7  
Old 07-02-2003, 11:07 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
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Nothing if the "solenoid switch" is operates a set of contacts to close a high current circuit.

A relay is a solenoid that pulls a contact against a spring to close (or open) a set of contacts. When curent flows through the coil, the contacts are either closed (normally open relay) or opened (normally closed relay).

A solenoid can operate other things, though -- such as the pressure control valve in an automatic transmission for electric kickdown, etc.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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