Parkerscottages Posted April 24, 2019 Report Share Posted April 24, 2019 I will test the temp gauge , I have a digital thermometer and can use in boiling water and measure the movement on the dial. I assume the reading is from about 50C to 120C? R Quote Link to post Share on other sites
Graham Harris Posted April 24, 2019 Report Share Posted April 24, 2019 I fitted the Revotech fan when I did my rebuild in 2012 and it has recently decided to make intermittent contact when it first comes up to fan temp, I think the adjustable fan controller is on the blink when I put power to the relay the fan starts instantly but when the thermo switch tries to come on it makes some nasty clicking and clacking noises. They are not cheap but I think I will have to replace it. Graham Quote Link to post Share on other sites
Lebro Posted April 24, 2019 Report Share Posted April 24, 2019 Mine did just the same, I removed it, &now use an "Otter switch" (bi-metalic) to bring the fan on. Bob. Quote Link to post Share on other sites
Waldi Posted April 24, 2019 Report Share Posted April 24, 2019 3 hours ago, Parkerscottages said: I will test the temp gauge , I have a digital thermometer and can use in boiling water and measure the movement on the dial. I assume the reading is from about 50C to 120C? R Hi Richard, You can take 2 or 3 temperatures, like 70,85 ,100 degr. C. If you test on the bench: make sure you use the 10V connection that the voltage stabilizer delivers, otherwise your readings will be off. If the gauge is still installed, that is no issue. I marked 2 temperatures with a permanent marker on the gauge glass. Waldi Quote Link to post Share on other sites
Graham Harris Posted April 25, 2019 Report Share Posted April 25, 2019 (edited) Bob, can you tell me what your Otter switch looks like and how you set it up? Edited April 25, 2019 by Graham Harris Quote Link to post Share on other sites
Lebro Posted April 25, 2019 Report Share Posted April 25, 2019 (edited) https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/cooling-system/cooling-fan-fittings/water-pipes-and-fan-switches.html I fitted the stainless pipe (between bottom hose & W pump) which has a threaded boss to take the Otter switch. I chose the 92° one, as I do not want the fan to come on under normal conditions, but it does come on well before boiling point. I also have an override switch, which I use if I know I will be stuck in traffic for a while. Bob. P.S. I retained the Revotech relay, switching it from either the Otter switch or the override switch Edited April 25, 2019 by Lebro Quote Link to post Share on other sites
Graham Harris Posted April 25, 2019 Report Share Posted April 25, 2019 Thank you, Bob I didn't realise Moss offered an alternative to the Revotech. Graham Quote Link to post Share on other sites
Lebro Posted April 25, 2019 Report Share Posted April 25, 2019 Not just Moss, these parts are available from Rimmers, TR shop etc. The Otter switches are commonly used on modern cars also. Bob Quote Link to post Share on other sites
BlueTR3A-5EKT Posted April 26, 2019 Report Share Posted April 26, 2019 23 hours ago, Graham Harris said: Thank you, Bob I didn't realise Moss offered an alternative to the Revotech. Graham Perhaps you could find one closer to home, although at AUS$48.00 they are not cheap. The threaded boss it screws into comes form the radiator repair shop. Then just a bit of TR owner skill for added value. https://tridon.com.au/products/Tridon/35/483/switches-and-sensors/2014/thermo-fan-switches#3 Cheers Peter W Quote Link to post Share on other sites
Parkerscottages Posted April 27, 2019 Report Share Posted April 27, 2019 (edited) Update i have wired in a manual switch and that operates the fan which is good i have also removed air from the system If I now run the engine I get the following 1. Hot thermostat housing 2. Hot water for the heater hoses 3. Cold top hose and cold stainless pipe in which the Revotec sender sits is cold which is not good but the temp dial is recording hot so is the thermostat the issue, it’s a new one from Moss Any ideas? thanks richard Edited April 27, 2019 by Parkerscottages Update Quote Link to post Share on other sites
Graham Harris Posted April 27, 2019 Report Share Posted April 27, 2019 Thanks, Peter W I did find the Tridon switches and yes they are costly. Graham Quote Link to post Share on other sites
Waldi Posted April 27, 2019 Report Share Posted April 27, 2019 Richard, I hope you forgive me for asking: how did you install the thermostat? The spring should be on the bottom, the flat side facing upwards. Hope that is the case? If not, the thermostat will not open. I have a Moss thermostat too, tested it in hot water, it started opening at around 80degr.C Waldi Quote Link to post Share on other sites
Parkerscottages Posted April 28, 2019 Report Share Posted April 28, 2019 The thermostat is vertical with the spring pointing into the body of the housing facing towards the car Is that correct? Quote Link to post Share on other sites
Lebro Posted April 28, 2019 Report Share Posted April 28, 2019 Yes, that is correct. I would take it out & check that it opens up in hot water above its operating temp (stamped on the base) around 82 - 88 °C Bob Quote Link to post Share on other sites
BlueTR3A-5EKT Posted April 28, 2019 Report Share Posted April 28, 2019 (edited) 36 minutes ago, Parkerscottages said: The thermostat is vertical with the spring pointing into the body of the housing facing towards the car Is that correct? Images from sales catalogues For TR2-3-4 item 22 https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/cooling-system/water-pumps-fittings/water-pump-thermostat-fittings-tr2-4a.html For TR250/5/6 item 43 https://rimmerbros.com/Item--i-GRID600026 Peter W Edited April 28, 2019 by BlueTR3A-5EKT Quote Link to post Share on other sites
Waldi Posted April 28, 2019 Report Share Posted April 28, 2019 The thermostat should have a small vent hole, normally with a little rivet rattling in it to avoid it plugs up. If the hole is not there, it is more difficult to remove the entrapped air towards the radiator (where it will stay as flow is downwards). If the stat is surrounded by semi-hot air, it will take longer to open. But some stats are supplied without that hole, so I’m not sure if this is very important. It certainly helps. If there is no hole, I would drill a 3 mm (1/8”) hole in the flat round part of the stat. Waldi Quote Link to post Share on other sites
Parkerscottages Posted April 28, 2019 Report Share Posted April 28, 2019 Quote Link to post Share on other sites
Parkerscottages Posted April 28, 2019 Report Share Posted April 28, 2019 I will remove the little bugger this morning and test it in hot water to see if it opens, watch this space..... Quote Link to post Share on other sites
Z320 Posted April 28, 2019 Report Share Posted April 28, 2019 Hi, air trapped in the system, in the cylinder head or in the thermostat housing is the common told story. But it is all fiction, wishfull thinking of not existing problems. Don't care about that. Ciao, Marco Quote Link to post Share on other sites
Motorsport Mickey Posted April 28, 2019 Report Share Posted April 28, 2019 14 minutes ago, Z320 said: Hi, air trapped in the system, in the cylinder head or in the thermostat housing is the common told story. But it is all fiction, wishfull thinking of not existing problems. Don't care about that. Ciao, Marco So what is the problem area then Marco ? Mick Richards Quote Link to post Share on other sites
Parkerscottages Posted April 28, 2019 Report Share Posted April 28, 2019 I have now tested the thermostat in hot water with a digital temp probe At 82 C it opens about 2-3mm is that enough R Quote Link to post Share on other sites
BlueTR3A-5EKT Posted April 28, 2019 Report Share Posted April 28, 2019 (edited) 40 minutes ago, Parkerscottages said: I have now tested the thermostat in hot water with a digital temp probe At 82 C it opens about 2-3mm is that enough R Yes starting to open at 82 is good if that is the number stamped on the thermostat centre wax capsule or somewhere else. That will mean the water is starting to circulate past the thermostat and into the radiator via top hose. Does it fully open? What temp is it fully open at? Will probably be from 86-90 C. ie spring compressed and valve open 1/2" or more. Cheers Peter W Edited April 28, 2019 by BlueTR3A-5EKT Quote Link to post Share on other sites
Z320 Posted April 28, 2019 Report Share Posted April 28, 2019 2-3 mm is not enought. Quote Link to post Share on other sites
Z320 Posted April 28, 2019 Report Share Posted April 28, 2019 (edited) 1 hour ago, Motorsport Mickey said: So what is the problem area then Marco ? Mick Richards I don't know, but never air. Air is always the easy explanation when there is no other idea. Edited April 28, 2019 by Z320 Quote Link to post Share on other sites
Parkerscottages Posted April 28, 2019 Report Share Posted April 28, 2019 Update the rad now gets ( to hot to rest my hand on) but the stainless pipe in to which the Revotec sits is not so hot that I cannot rest my hand suggestions greatly fully received thanks R Quote Link to post Share on other sites
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