Harald/Austria 5 Posted March 8, 2015 Report Share Posted March 8, 2015 Good Evening, I was doing my Chargecooler Impeller today ... see how it was look like - there was all blades gone. What makes me wonder is that the Impeller Housing isnt all round look at the Picture on 12o Clock Position. Are this just Lotus Tolerance or is it a bad part from Factory ? Regards Harald Quote Link to post Share on other sites
Bibs 11,109 Posted March 8, 2015 Report Share Posted March 8, 2015 It's "eccentric", that's how it's meant to be. You'd be much better off going to an electric pump as most people do but either way make sure you give the system a very, very good flush to get the old, disintegrated blades out if you can. Quote 88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport Evora NA For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. Link to post Share on other sites
glynherron 9 Posted March 8, 2015 Report Share Posted March 8, 2015 Been playing with mine today and starting to reassemble the engine when a though occured to me as to why these impellors fail. According to the manual, when working on the timing you have to back up 90 degrees. Well the rubber impellor doesnt enjoy going backwards and puts a lot of pressure on it. This could be a mode of failure... Glyn Quote Link to post Share on other sites
ramjet 1,085 Posted March 9, 2015 Report Share Posted March 9, 2015 Eccentric as Bibs said is normal. You are absolutely correct Glyn. The impeller is not designed to go backwards at all. There is a part pf me that would suggest removing the impeller to do the timing and then reassemble once done. A pain, but.......... Quote All we know is that when they stop making this, we will be properly, properly sad.Jeremy Clarkson on the Esprit. Opinions are like armpits. Everyone has them, some just stink more than others. Link to post Share on other sites
glynherron 9 Posted March 9, 2015 Report Share Posted March 9, 2015 I pulled the pump out of mesh with the drive ☺ Quote Link to post Share on other sites
ramjet 1,085 Posted March 9, 2015 Report Share Posted March 9, 2015 Same effect and easy solution. Saves breaking the pump open. Quote All we know is that when they stop making this, we will be properly, properly sad.Jeremy Clarkson on the Esprit. Opinions are like armpits. Everyone has them, some just stink more than others. Link to post Share on other sites
lotus4s 24 Posted March 10, 2015 Report Share Posted March 10, 2015 When changing a timing belt, the belt should already be disengaged from the pulleys when you rotate the engine back 90 degrees. The impeller should never be rotated backwards.... Quote 1995 S4s Link to post Share on other sites
Chillidoggy 4,340 Posted March 10, 2015 Report Share Posted March 10, 2015 What's the speed range of the impeller? Quote Margate Exotics. Link to post Share on other sites
Zolder 11 Posted March 10, 2015 Report Share Posted March 10, 2015 What's the speed range of the impeller? As it runs off the redundant distributor shaft, I have always assumed one revolution of the pump equals one engine revolution..... I might be wrong though..... Quote Link to post Share on other sites
glynherron 9 Posted March 10, 2015 Report Share Posted March 10, 2015 When changing a timing belt, the belt should already be disengaged from the pulleys when you rotate the engine back 90 degrees. The impeller should never be rotated backwards.... Correct! However there may be occasions when it is accidentally rotated, for instance when loosening the crank pulley bolt... Quote Link to post Share on other sites
Gold FFM Escape 776 Posted March 11, 2015 Gold FFM Report Share Posted March 11, 2015 As it runs off the redundant distributor shaft, I have always assumed one revolution of the pump equals one engine revolution..... I might be wrong though..... In a 4-stroke, the distributor and camshafts run at half the engine speed (pulleys twice the size), so the impeller should be rated to about 4000rpm. Quote I have made many mistakes in my life. Buying a multiple Lotus is not one of them. Link to post Share on other sites
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