SpitfireGeorge Posted June 20, 2018 Report Share Posted June 20, 2018 Hi Guys, Can anybody recommend a decent piston gudgeon pin removal tool. I have taken my Spitfire Mk3 engine apart to rebuild and found that some of the land between the first and second ring on one piston has broken off and I now need a new set of pistons! I don't want to pay loads of money for one though as I will probably never use it again. Cheers, Brett Link to comment Share on other sites More sharing options...
DerekS Posted June 20, 2018 Report Share Posted June 20, 2018 I've never done any work on pistons Brett but previous experiences with alloy usually involved dunking it in really hot water for a few minutes, it expands a lot quicker than steel making the pin a loose fit. Could be worth a try... Link to comment Share on other sites More sharing options...
NonMember Posted June 20, 2018 Report Share Posted June 20, 2018 Are they interference fit or circlip type? When I swapped con-rods on my Vitesse the gudgeon pins were circlip type and just pushed out with a soft dowel (once the circlips were removed, obviously). Interference ones should respond to Derek's "very hot water" trick. Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 20, 2018 Report Share Posted June 20, 2018 I agree, in the old days it was as Derek mentioned a dunk in a bucket of hot water and they slide out easy Pete Link to comment Share on other sites More sharing options...
SpitfireGeorge Posted June 20, 2018 Author Report Share Posted June 20, 2018 Thanks Guys, They are circlip type so I will try the dowel first followed by dunking if unsuccessful. Cheers, Brett Link to comment Share on other sites More sharing options...
PeteH Posted July 6, 2018 Report Share Posted July 6, 2018 Hi An alternative, when re assembling, is to lightly oil the pins and put them in the freezer overnight. Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 6, 2018 Report Share Posted July 6, 2018 go back to the old school experiment with a ring and a ball the bore always expands radially more then the Pin and the hot alloy piston will expand far more the the frozen pin will shrink have faith in the bowl of hot water Pete 1 Link to comment Share on other sites More sharing options...
PeteH Posted July 6, 2018 Report Share Posted July 6, 2018 I would not disagree, and likely far more convenient for a Triumph. I have chilled the likes of wheel bearings before to-day to make fitting into cast housings easier, If it isn't already vac; packed, pack it into a Freezer bag, suck the air out with a straw, quite often they fall into place. It worked very well in marine practice, especially when the gudgeon pin is in excess of 100mm dia, and the piston is 450mm dia and weighs in in excess of 250kg.! And you are working in 40degC.! Pete Link to comment Share on other sites More sharing options...
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