jackb_ms Posted May 11, 2009 Share Posted May 11, 2009 Quick question Should there a some kind of o ring seal between the water temperature sender and the water rail? If yes, what kind should it be? would a motor factor have one or is it a Caterham car special? Cheers Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
Gingerbread Man Posted May 11, 2009 Share Posted May 11, 2009 I fitted a new water temp sender a few months back. I wound a bit of PTFE on the threads and screwed it right in. Link to comment Share on other sites More sharing options...
tweeky Posted May 11, 2009 Share Posted May 11, 2009 I think you`ll find the threads tapered so it seals Tweeky In a purple haze Link to comment Share on other sites More sharing options...
7 wonders of the world Posted May 11, 2009 Share Posted May 11, 2009 Tapered thread as previously mentioned - make sure you don't over tighten it though or you'll shear the little bugger off ☹️ Too young to be old ! Link to comment Share on other sites More sharing options...
CageyH Posted May 11, 2009 Share Posted May 11, 2009 Which temp sender? The ECU or the temp gauge? Only dead fish go with the flow....! Link to comment Share on other sites More sharing options...
Myles Posted May 11, 2009 Share Posted May 11, 2009 or you'll shear the little bugger off Ah-yes! Been there I did just that - and had to fit the 'R500' submarine instead - but managed to remove the stub in the end. From memory, both the ECU sender and certainly the instrument sender can be sealed with just PTFE. I think the ECU sender thread is straight (rather than tapered) - but I might be wrong there. The tapered thread is definitely a case of tighten-lightly, run the engine, check for leaks. Then - if and only-if you've got a leak - tighten a little more. 🙆🏻 🙆🏻 🙆🏻 🙆🏻 🙆🏻 Alcester Racing 7s Ecosse™ 🙆🏻 🙆🏻 🙆🏻 🙆🏻 🙆🏻 Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
jackb_ms Posted May 11, 2009 Author Share Posted May 11, 2009 Cheers Gentlemen It the sender for the gauge. Will try to fit the new rail tomorow. The gasket for the rail, is it handed? It is not the same size as the end of the water rail. Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
Myles Posted May 11, 2009 Share Posted May 11, 2009 The gasket for the rail, is it handed? Not that I remember. There have been various designs of water-rail for the 7, but I don't believe the block has changed (1.4s excepted, possibly). I assume that this dates back to the discussion we had regarding easing a bit of sealant in to cure a leak without removing the whole thing...? The important thing is that the *holes* in the gasket aren't smaller than those in the block/rail - but I'm fairly sure that the gaskets I had matched pretty-well... 🙆🏻 🙆🏻 🙆🏻 🙆🏻 🙆🏻 Alcester Racing 7s Ecosse™ 🙆🏻 🙆🏻 🙆🏻 🙆🏻 🙆🏻 Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Gingerbread Man Posted May 11, 2009 Share Posted May 11, 2009 Having just put my engine back in yesterday, the water rail gasket does have an wrong and right way. Two bolts hold it on which are at diagonals from each other. Also the bottom right of it has a slight notch. Basicly yes it's handed but obvious to which way it goes. I'm talking K series. Link to comment Share on other sites More sharing options...
jackb_ms Posted May 11, 2009 Author Share Posted May 11, 2009 Yes Miles, You are correct. This is the gasket i have this gasket I have place it on the water rail and as far as I understand the squared part of the hole is closer to the back of the engine. Is it what you mean Gingerbread Man? Cheers Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
Gingerbread Man Posted May 11, 2009 Share Posted May 11, 2009 I think the notched bit is bottom right, closer to the bell housing. Does this tie in with what you think? Link to comment Share on other sites More sharing options...
David Brown Posted May 12, 2009 Share Posted May 12, 2009 If you use PTFE tape on the sender, don't use much as it needs to earth thru' the thread to the rail in order to work. David Link to comment Share on other sites More sharing options...
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