Jeffds1360 Posted July 15, 2020 Report Share Posted July 15, 2020 Got the car warmed up properly for the first time since purchase yesterday and my idle revs were about 1100, throttle stop was screwed right back and the choke quadrant was clear. Could not get it to slow down. Unscrewed damper a touch and it reved even higher! What is worn lads? seriously getting me down now. Do not suppose there are any old triumph specialists just north east of Hadrian's wall Link to comment Share on other sites More sharing options...
NonMember Posted July 15, 2020 Report Share Posted July 15, 2020 High idle is often caused by air leaks. It only needs a really tiny leak. However, increased idle speed as you unscrew the damper (I presume you mean the black plastic dashpot cap) seems odd - it might suggest wear in the upper body or piston. Do the usual carb condition tests first:- check the piston lifts cleanly and drops sharply (makes a clonk); check the throttle shaft rotates smoothly and returns fully, and that it has no significant end- or side-play. Is there any movement of the carb body, if you try to lift it? Obviously don't try to jack the car up on it, but you can give it a decent tug. Movement suggests loose fixings, either the manifold to engine or the carb to manifold. Either would cause air leaks. Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 15, 2020 Report Share Posted July 15, 2020 apart from air leaks in the breather system it may have a diaphragm problem it may be fitted with the location lugs out of place , worn throttle spindles can be felt with s wiggle but unlikely to raise the idle that much remove the top cover have a look if the diaphragm is all wrinkled /baggy wash it in petrol to reform it the holes in the base of the air piston must be facing the engine side i guess this is a CD150 with what call thames barrier type choke arrangement Pete Link to comment Share on other sites More sharing options...
Jeffds1360 Posted July 15, 2020 Author Report Share Posted July 15, 2020 Thanks guys. I replaced the diaphragm last week and am happy it is 'in its slots. there is 'tiny' movement in the spindle but nothing much at all, Piston drops well and no movements anywhere. Guess it is a worn body then. Just like mine! I guess with 126k (engine only has 26K) the CD150 is nearly 50yrs old so will need attention. What is best way to refurb? can I get parts and DIY?...............the list is getting longer, my temper shorter, my pockets emptier and my wife is getting ignored Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 15, 2020 Report Share Posted July 15, 2020 you must first be clear there are no air leaks from manifolds or breather systems !!!!!!!!!!!!! if nothing else a squirt of engine oil on the joints or any expected wear leak will get sucked in when idling if its a leaker many suppliers have some parts Burlen fuel systems probably the most as for wear the spindle wears a lot more than the body and easy to replace i have used the carb exchange in leighton buzzard good guy no frills or bullsshine http://www.carbex.demon.co.uk/ some do lots of shiny but the rest is problematic , got pleant of tee shirts for sorting hi costing cock ups youre a bit too far away for a visit pete Link to comment Share on other sites More sharing options...
Jeffds1360 Posted July 15, 2020 Author Report Share Posted July 15, 2020 Just double checked and maybe the diaphragm body lug was a touch out. Hey! I have a tickling stick on the carb!!! No need to take air filter off and use a thin screwdriver. Very handy. No mention of that in the manual. No chance to test it when warmed up as it was raining and I'm not waterproof! What exactly is the breather system? The vacuum pipe to distributor seems a bit manky, might replace that. Time for T again. Enough today Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 15, 2020 Report Share Posted July 15, 2020 breather system the hoses and any valve starting at the rocker cover and ends up into the manifold often with a smiths emission valve in between dont think 13/60 had a smiths valve just a hose from rocker to filter lifting pins are fitted to all SU and Strombergs until emissions started to creep in to designs and twiddling was made difficult if you remove the air filter you wreck any hope of them showing wahts going on as you have upset the depression in the carb, and mixtures are all upset the trick with lifting pins is touchy feely ,, lift to just contact the air piston inside , then raise the piston a few mm if you yank it up it will just stop so a small light lift 2mm you are looking for a hint of change if revs pick up +50 rpm for a short its rich if it drops 50rpm its weak if no change its fine so get the filters on and tickle it........... its not a wam bang thankyou job Pete Link to comment Share on other sites More sharing options...
Jeffds1360 Posted July 15, 2020 Author Report Share Posted July 15, 2020 Yes Pete, gotcha. The rocker cover has a breather to air filter but it is not air tight. That is just emissions 'control' surely, not related to mixture ?? I have checked mixture via about 1/16 inch lift and all is well. I have sensitive finger tips and can feel the piston no problem Jeff Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 15, 2020 Report Share Posted July 15, 2020 so its a std 13/60 open breather , you cant pre judge whats been fitted over the years , many engines have a sealed breather which is fed to the manifold so any air in ups the idle you dont have that complication it could be lacking adjustment with the butterfly not centralised or even worn side edges to the disc a new spindle and throttle plate might be on the cards have you checked the timing , over advanced will increase idle speeds Pete Link to comment Share on other sites More sharing options...
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