The 616 motor I'm using for a project has two electrical senders along the head - along the axis of the glow plugs. My 240td has only one sender... the one towards the rear of the motor. what is the other one? both look identical, with the same plug-on style connection.

Thanks.

From threads about converting older style loop plugs to newer pencil plugs, it has been reported that there is some other sensor related to the functioning of the early loop style plugs. Perhaps this additional sensor is what you see.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

On my 80 240, it origionally had (and still now has) the pencil type plugs, it had 2 sensors along the head, first one between #1&2 glow plugs, 2nd one between #3&4. One of those sensors will be marked with "NTC" in the etching along the brass nut faces. One of the sensors controls your temp gauge on the dash, the other one controls the timing of the GP relay in relation to engine heat. I can't remember offhand without dashing out to look, but I believe the NTC one was for the relay. you should be able to look at your TD to see which one is used for the dash gauge.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale

That's correct. I can't remember which does what either. Both my 79 616 and 80 617 turbo had two sensors.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine