SpitfireGeorge Posted April 29, 2023 Report Share Posted April 29, 2023 Hi Guys, Working on the final million jobs to do on my mk3 Spitfire before I can use it again. The o/d solenoid seems very stiff and the brass lever seems to catch on the thread of the pull-on pull-off piston. Also when I turn it off it does not fully go back to its original position. Does the o/d oil pressure force it back when being switched off. Cheers Brett Link to comment Share on other sites More sharing options...
johny Posted April 29, 2023 Report Share Posted April 29, 2023 No assistance from oil pressure when the solenoid is de-energised, there must be a spring in the solenoid that pushes its plunger back out although this isnt shown in the manual. Be careful that its operating correctly as when fully operated the current the solenoid draws should drop to 2A from the initial 20A and if this doesnt happen the coil will quickly burn out.... Link to comment Share on other sites More sharing options...
SpitfireGeorge Posted April 29, 2023 Author Report Share Posted April 29, 2023 I have an ammeter wired in the solenoid operating system which shows about 2A when switched on. It never goes to to 20A at all. Cannot get a 3/16 in drill in to set it up though so will try something a little smaller on Sunday. The whole solenoid movement is definately not smooth though. Link to comment Share on other sites More sharing options...
johny Posted April 29, 2023 Report Share Posted April 29, 2023 Think a 3/16" shaft has to enter or theres something wrong with the adjustment. I wonder if the solenoid itself needs overhauling - theres been some good previous posts on here about doing that.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 29, 2023 Report Share Posted April 29, 2023 its not uncommon for the solenoid armature/ plunger to get corroded and sticking there is a solid state switch in the end that cuts the current when its fully travelled and it doesnt have to move much i would remove the sol and clean it up , you cant service the switch very early ones were accessible but often a mend it to destruction as jonny say there is no crossover of hydraulics to the sol. the 3/16 drill alignment just set the lever up to ensure the HYD valve is lifted worth a check take off the top cap nut remove the ball and spring and withdraw the needle it has a tiny hole down its middle which can get blocked Pete Link to comment Share on other sites More sharing options...
SpitfireGeorge Posted April 29, 2023 Author Report Share Posted April 29, 2023 Thanks for the help guys. I will give your suggestions a try. Cheers Brett Link to comment Share on other sites More sharing options...
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