wayne taylor Posted July 6, 2013 Report Share Posted July 6, 2013 After a shortish run (10miles) I find that the water pump bolt at the front is very very hot. I also notice that the dynamo is hot (too hot to touch for long)and also (what I would term) excessive heat is transferred to the fat fan belt. Is this normal? Quote Link to post Share on other sites
peejay4A Posted July 6, 2013 Report Share Posted July 6, 2013 (edited) Normal. Assume you have an 88 degree thermostat. Now try dipping a finger in water at 88 degrees. Actually, don't do that. Edited July 6, 2013 by peejay4A Quote Link to post Share on other sites
wayne taylor Posted July 6, 2013 Author Report Share Posted July 6, 2013 What I find strange is that the front end of the water pump pulley (the nut end) is only about 'x' inches from the radiator so it should be getting cool air passing over it. Secondly when I touch my main cars alternator and especially its fan belt - it is cool to the touch. The belt is ambient temperature. Is this really right that the dynamo on the TR4 should be too hot to touch? Quote Link to post Share on other sites
Alec Pringle Posted July 6, 2013 Report Share Posted July 6, 2013 Both dynamo and water pump will get pretty hot, yes. Do check the belt tension . . . . if it is too tight then you will put an additional load on the bearings, dynamo and pump alike, which will generate extra heat and knacker both units ! Cheers Alec Quote Link to post Share on other sites
AlanT Posted July 7, 2013 Report Share Posted July 7, 2013 What did the books used to say about fan-belts, before we had thin toothed ones? 1/2 in free play in the longest side I think. Quote Link to post Share on other sites
terry Posted July 7, 2013 Report Share Posted July 7, 2013 Haynes say 3/4 of an inch,...i run mine between 3/4 and i inch,never less,.. if you are running with 1/2" you could be asking for trouble with your dynamo and your pump beariings, regards Terry Quote Link to post Share on other sites
AlanT Posted July 7, 2013 Report Share Posted July 7, 2013 There you go nice slack belt may halp. If you take the field connection off the dyno it wont do anything electrical. So any heat will be coming from the engine. The ignition will be discharging the battery but this wont matter for 15mins or so. Quote Link to post Share on other sites
wayne taylor Posted July 7, 2013 Author Report Share Posted July 7, 2013 Fan belt tension is perfect, it's actually 1/2" either way making it a total of 1" along its longest length. We've wandered off topic a little. What are your front extremity of the water pump and the dynamo temperatures like please chaps - simples! Quote Link to post Share on other sites
stuart Posted July 7, 2013 Report Share Posted July 7, 2013 Fan belt tension is perfect, it's actually 1/2" either way making it a total of 1" along its longest length. We've wandered off topic a little. What are your front extremity of the water pump and the dynamo temperatures like please chaps - simples! I wouldnt want to put my hands anywhere near after a hard run. Stuart. Quote Link to post Share on other sites
RogerH Posted July 7, 2013 Report Share Posted July 7, 2013 Hi Wayne, don;t forget the cooling air through the radiator will be quite warm on exiting the rad. Roger Quote Link to post Share on other sites
terry Posted July 7, 2013 Report Share Posted July 7, 2013 (edited) post deleted Edited July 7, 2013 by terry Quote Link to post Share on other sites
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