Robert Bohl Posted October 17, 2019 Share #1 Posted October 17, 2019 Does anyone know the thread size for the 240Z water temp sensor? I want to update / replace the gauge but rather not change the fitting on the engine. Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/ Share on other sites More sharing options...
Captain Obvious Posted October 18, 2019 Share #2 Posted October 18, 2019 I don't know off the top of my head, but I'll check when I get a chance. I can tell you that it's a straight thread, and not a taper thread. I suspect that will complicate your project a little. Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-585880 Share on other sites More sharing options...
duffymahoney Posted October 18, 2019 Share #3 Posted October 18, 2019 I have an updated sensor I would sell cheap that I have left over for it. Shoot me a message. Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-585892 Share on other sites More sharing options...
zKars Posted February 24, 2020 Share #4 Posted February 24, 2020 The temp sensor is a straight thread, not a tapered pipe thread. The temp sensor is a two part deal like a brake fitting. Finding an adapter will be a trick. I feel quite bad not knowing the thread spec off by heart.... Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593036 Share on other sites More sharing options...
Firepower Posted February 24, 2020 Share #5 Posted February 24, 2020 (edited) It looks to be M16 x 1.75 I can measure the 1.75 thread pitch, but I don't have a bolt that big to check it fits. Looks like an M16 as a 16mm deep socket takes it off, and the threads are nearly the same size width as the ‘head’ But as I said, just buy one, it’s like $10 Rockauto-temperature-sender-1T1181 It fits all these Nissan cars: Nissan cars & trucks: 200SX 1977-1983 240Z 1970-1973 260Z 1974 280Z 1975-1978 280ZX 1979-1983 B210 1974-1978 F10 1976-1978 Maxima 1982-1983 Pick Up 1968-1985 Pulsar 1986 Sentra 1982 Stanza 1982, 1984-1986 210 1979-1982 310 1979-1982 510 1968-1973, 1978-1981 610 1973-1976 710 1974-1977 810 1977-1981 1000 Series 1968-1973 2000 Series 1968-1970 Edited February 24, 2020 by Firepower Bolt size and links Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593038 Share on other sites More sharing options...
foosman Posted February 24, 2020 Share #6 Posted February 24, 2020 The one I pulled from my '71 a few months ago measures M16 x 1.5, not 1.75. Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593056 Share on other sites More sharing options...
grannyknot Posted February 24, 2020 Share #7 Posted February 24, 2020 This temp sensor is from an early 72, it is M16x1.5, straight threads no taper. Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593058 Share on other sites More sharing options...
Captain Obvious Posted February 24, 2020 Share #8 Posted February 24, 2020 And although nobody asked (rarely stops me), here's some additional info about those sensors. The original sensors are actually two pieces. A steel threaded portion and a brass sensor portion. The steel part uses a straight thread and the reason they can get away with a straight thread (not tapered) is because that's not what holds back the coolant liquid. The liquid sealing surface actually has nothing to do with the threads. The liquid is sealed by the small beveled edge further down the sensor. Taking liberties with Granny's photo: Some of the newer aftermarket sensors are all one piece brass like the below. Note that the O-ring does not hold back the coolant. All it does is keeps dirt and junk out of the threads. The same beveled surface is what keeps the coolant in: 4 Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593069 Share on other sites More sharing options...
Av8ferg Posted February 25, 2020 Share #9 Posted February 25, 2020 I just confirmed this week that the temp sensor is a M16 x1.5. I went to specialty bolt shop to buy two plugs for my housing since it from a ZX and has extra holes. The guy measured all the holes for me. That’s what he measured for the temp sensor. Sent from my iPhone using Tapatalk Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593125 Share on other sites More sharing options...
Captain Obvious Posted February 25, 2020 Share #10 Posted February 25, 2020 I like those plugs. Are they flat bottoms? Like made to be used with a crush washer seal of some sort? Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593166 Share on other sites More sharing options...
Zed Head Posted February 25, 2020 Share #11 Posted February 25, 2020 They look like oil pan plugs. Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593176 Share on other sites More sharing options...
Av8ferg Posted February 25, 2020 Share #12 Posted February 25, 2020 They are pretty nice plugs. I went to several places including Fastenal and nobody had anything other than a typical bolt. So they do look like a pan plug and have a flat flange base with a rubber o-ring. They were like $2.50 each. CO if you need some let me know and I’ll grab them for you. I need to reduce my beer tax I have going with you so far. Sent from my iPhone using Tapatalk 1 Link to comment https://www.classiczcars.com/topic/63011-71-temp-sensor-thread-size/#findComment-593179 Share on other sites More sharing options...
dspillman
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