Carl123 Posted January 15, 2020 Report Share Posted January 15, 2020 Hi. I have just took the water temp sender out of 1.8 bmc diesel I tried to get one some one said it was 1/2 bsp then took it to shop to get one they said it was unf. It's got to contacts on the top any idea. We're to get one from or can I convert. It to a modern sender thanks Link to comment Share on other sites More sharing options...
rusty69 Posted January 15, 2020 Report Share Posted January 15, 2020 Have you tries ASAP? Link to comment Share on other sites More sharing options...
Athy Posted January 15, 2020 Report Share Posted January 15, 2020 Or Calcutt Marina, who are BMC engine specialists? Link to comment Share on other sites More sharing options...
alan_fincher Posted January 15, 2020 Report Share Posted January 15, 2020 A temperature sensor also has to be correctly matched to the sender in use, or the gauge may not read correctly. I also think I have only seen sensors with a single terminal on BMC B series engines, and that having 2 terminals may be unusual. (I might be wrong though!) Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 15, 2020 Report Share Posted January 15, 2020 This is the one that Calcutt offer http://calcuttboatsshop.com/epages/c3a6cb0f-3e0f-4132-9636-974f7502e04d.sf/en_GB/?ObjectPath=/Shops/c3a6cb0f-3e0f-4132-9636-974f7502e04d/Products/A1FAR90412BULK Link to comment Share on other sites More sharing options...
WotEver Posted January 15, 2020 Report Share Posted January 15, 2020 6 minutes ago, ditchcrawler said: This is the one that Calcutt offer http://calcuttboatsshop.com/epages/c3a6cb0f-3e0f-4132-9636-974f7502e04d.sf/en_GB/?ObjectPath=/Shops/c3a6cb0f-3e0f-4132-9636-974f7502e04d/Products/A1FAR90412BULK Definitely different. Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted January 15, 2020 Report Share Posted January 15, 2020 (edited) What is the temperature gauge? Who made it? A picture would be good. Front side and any writing on the back. It may be possible to work backwards and deduce the sender from that. Do you have a vernier caliper by any chance. The outside diameter and pitch of the threads would help decide if it is BSP, or UNF. Or try running it in to a 1/2"BSP threaded something. Any suitable plumbing fitting, which will confirm it is that or not. Jenny Edited January 15, 2020 by Jen-in-Wellies Link to comment Share on other sites More sharing options...
jonathanA Posted January 15, 2020 Report Share Posted January 15, 2020 I doubt it’s 1/2 bsp they are often NPT which are very similar but slightly different thread. I have seen the strong in arm weak in head make them fit.... as Jen says try it in a proper BSP fitting. There are two specs for senders euro and us and the sender and gauge need to match. personally I would order a new gauge and sender off fleabay for about a fiver and and adapter for the sender if it’s not the right thread. is there a separate sender for the temperature warning light ? Link to comment Share on other sites More sharing options...
Carl123 Posted January 15, 2020 Author Report Share Posted January 15, 2020 Thanks. For all the replies. It's a strange one iv seen a few bmc engines. They all have 1 connecte on them some one else said it could of been retated out for that sender I'll have a look. For new clock and sender I think thank you all Link to comment Share on other sites More sharing options...
StephenA Posted January 15, 2020 Report Share Posted January 15, 2020 Looks like one of these Which is a domestic temp sensor from a central heating system Link to comment Share on other sites More sharing options...
WotEver Posted January 15, 2020 Report Share Posted January 15, 2020 2 minutes ago, StephenA said: Looks like one of these Yes it does. Link to comment Share on other sites More sharing options...
Boater Sam Posted January 16, 2020 Report Share Posted January 16, 2020 (edited) Why have you taken it out? Do you know it is faulty? Have you tested the gauge by shorting the wires together? What was the fault with the gauge? What make is the gauge, name on the dial? Edited January 16, 2020 by Boater Sam Link to comment Share on other sites More sharing options...
alan_fincher Posted January 16, 2020 Report Share Posted January 16, 2020 9 hours ago, StephenA said: Looks like one of these Which is a domestic temp sensor from a central heating system True, but ASAP supplies do supply a whole range of ones that look very similar for marine use, such as this one.... Available in a number of thread sizes. However most seem to be only in US spec, so unless OP knows his gauge is a US rather than a Euro one they may not work, even if a match is achieved on thread. Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 16, 2020 Report Share Posted January 16, 2020 Is the one in the photo the one the OP took out or one he has bought with maybe the wrong thread? Link to comment Share on other sites More sharing options...
WotEver Posted January 16, 2020 Report Share Posted January 16, 2020 56 minutes ago, ditchcrawler said: Is the one in the photo the one the OP took out or one he has bought with maybe the wrong thread? The OP reads that it’s the one which he took out. Link to comment Share on other sites More sharing options...
Tony Brooks Posted January 16, 2020 Report Share Posted January 16, 2020 Is he sure its a temperature sender? It looks a bit like a Landy type cooling fan switch to me. Link to comment Share on other sites More sharing options...
Carl123 Posted January 16, 2020 Author Report Share Posted January 16, 2020 The one in the photo. Is what I took out of the head its been a night mare to find one Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted January 17, 2020 Report Share Posted January 17, 2020 9 hours ago, Tony Brooks said: Is he sure its a temperature sender? It looks a bit like a Landy type cooling fan switch to me. Could the OP tell us what colour wires are going to the sender? There is always the possibility that they follow the old British Standard for car wiring colours. The loom for a 1.8BMC I helped with did. This may determine if it is the water temperature sender. Jen Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 17, 2020 Report Share Posted January 17, 2020 10 hours ago, Jen-in-Wellies said: Could the OP tell us what colour wires are going to the sender? There is always the possibility that they follow the old British Standard for car wiring colours. The loom for a 1.8BMC I helped with did. This may determine if it is the water temperature sender. Jen It could even be a hi temp alarm and a temp gauge sender combined like Beta fit Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted January 17, 2020 Report Share Posted January 17, 2020 58 minutes ago, ditchcrawler said: It could even be a hi temp alarm and a temp gauge sender combined like Beta fit A possibility. Comparing wire colours at the sender plug and where they go in to gauges and warning lights may give more clues.If the loom is home made, or has been seriously hacked about, then who knows! Jen Link to comment Share on other sites More sharing options...
jonathanA Posted January 17, 2020 Report Share Posted January 17, 2020 Most likely it’s not an ‘earth return’ sender like it should be for marine applications (but usually aren’t) if one of the wires is connected to -ve that would confirm Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 17, 2020 Report Share Posted January 17, 2020 It would help if the OP tells us the make of the gauge Link to comment Share on other sites More sharing options...
Carl123 Posted January 17, 2020 Author Report Share Posted January 17, 2020 13 hours ago, Jen-in-Wellies said: Could the OP tell us what colour wires are going to the sender? There is always the possibility that they follow the old British Standard for car wiring colours. The loom for a 1.8BMC I helped with did. This may determine if it is the water temperature sender. Jen Hi I'll have a look at the wires and see what colors. They are the boat was built 1980 ish Link to comment Share on other sites More sharing options...
ditchcrawler Posted January 17, 2020 Report Share Posted January 17, 2020 1 minute ago, Carl123 said: Hi I'll have a look at the wires and see what colors. They are the boat was built 1980 ish Also look to see what make the gauge is and do you have a high temperature alarm Link to comment Share on other sites More sharing options...
Carl123 Posted January 17, 2020 Author Report Share Posted January 17, 2020 There is no name on the gauge what I can see apart it's got vdo on the face of it there is no alarm on it Link to comment Share on other sites More sharing options...
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