Dougie Swan 1 Posted March 10, 2023 Share Posted March 10, 2023 (edited) Hi Can anyone help with a crankshaft for either of the above engines? Anyone got a scrap engine lying about Thanks Dougie Edited March 10, 2023 by Dougie Swan 1 Quote Link to comment Share on other sites More sharing options...
John Wagg Posted March 11, 2023 Share Posted March 11, 2023 I presume that the pin has snapped off ? Mine pin snapped off due to miss-handling but I was fortunate to purchase the last one from Just Engines. I believe the pin is pressed in so it might be possible to press out the old bit and fit in a new one. Problem is finding someone to do it. ? Quote Link to comment Share on other sites More sharing options...
Dougie Swan 1 Posted March 11, 2023 Author Share Posted March 11, 2023 Thanks for that John Yes, that's what happened If it's pressed in then I can probably machine a new pin and do it myself Regards Dougie Quote Link to comment Share on other sites More sharing options...
John Wagg Posted March 11, 2023 Share Posted March 11, 2023 If you do I would be interested in the outcome. Quote Link to comment Share on other sites More sharing options...
David Davis 2 Posted March 12, 2023 Share Posted March 12, 2023 I have one of these. If it's a common fault you could probably set up a little sideline in repairing crank pins Dougie! Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 12, 2023 Share Posted March 12, 2023 22 hours ago, Dougie Swan 1 said: Thanks for that John Yes, that's what happened If it's pressed in then I can probably machine a new pin and do it myself Regards Dougie Hi Dougie. The crank pin could be just a cut down roller as used in roller bearings . Many engines used these . Very cheap and could save you some machining time. Better still check if an OS 30 fs crank will fit . The Asps were copies of the OS engines and cranks from the OS 52 fits the ASP 52 and 60 engines exactly . They are far better quality and run much smoother . Good luck and hope you get it running. Quote Link to comment Share on other sites More sharing options...
John Wagg Posted March 12, 2023 Share Posted March 12, 2023 What we need is a "how to". I can imagine pressing out the old pin but fitting a new one would be critical. I assume that heat and cold would be utilised? Quote Link to comment Share on other sites More sharing options...
Dougie Swan 1 Posted March 13, 2023 Author Share Posted March 13, 2023 Thanks for the replies How lucky am I, a long time ago I rebuilt another 30fs and while looking for an old carb I came across the old crankshaft so I have a replacement On the subject of replacing the crank pin I had a good look and if it is pressed in then it must be into a blind hole That might mean drilling from the back to punch the old one out I will keep you updated Dougie Quote Link to comment Share on other sites More sharing options...
Jon H Posted March 13, 2023 Share Posted March 13, 2023 15 minutes ago, Dougie Swan 1 said: On the subject of replacing the crank pin I had a good look and if it is pressed in then it must be into a blind hole I think they press the pin and then finish turn the crank so the hole is virtually invisible. I repaired a 52 for someone once and was messing about with the bent crank left over. It looked like one piece but i pressed in the general area of the middle of the pin and it eventually popped out. Quote Link to comment Share on other sites More sharing options...
Dougie Swan 1 Posted March 13, 2023 Author Share Posted March 13, 2023 Did it take much force to get it done Dougie Quote Link to comment Share on other sites More sharing options...
Jon H Posted March 13, 2023 Share Posted March 13, 2023 yea i had to lean on it quite hard which is not really a surprise as it needs to be a tight fit to stop the blasted thing falling out. Quote Link to comment Share on other sites More sharing options...
Dougie Swan 1 Posted April 29, 2023 Author Share Posted April 29, 2023 Hi So I finally got to the 30 with the broken crank pin I made a little jig to push it out, lined it up in the vice and bingo Now the issue is making a new pin It's a stepped pin, 5.25mm in the rear and 5mm for the con rod end My other thoughts are to remove the bronze bush from the con rod and make a new one 5.25mm dia then I don't need to make a stepped pin Any thoughts Dougie 1 Quote Link to comment Share on other sites More sharing options...
Jon H Posted April 29, 2023 Share Posted April 29, 2023 3 hours ago, Dougie Swan 1 said: My other thoughts are to remove the bronze bush from the con rod and make a new one 5.25mm dia then I don't need to make a stepped pin i would be tempted to just stuff a reamer through it rather than make a new bush. Quote Link to comment Share on other sites More sharing options...
Dougie Swan 1 Posted April 29, 2023 Author Share Posted April 29, 2023 Yes, but 5.25mm reamers don't come cheap Either way I have to decide if its worth it I bought it as broken, knowing that the crank pin was snapped but it was also missing the piston and liner, pushrod, conrod and gudgeon pin that I wasn't told Dougie Quote Link to comment Share on other sites More sharing options...
Dougie Swan 1 Posted April 29, 2023 Author Share Posted April 29, 2023 But, 7/32" reamers are much cheaper!! Dougie Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted April 30, 2023 Share Posted April 30, 2023 (edited) Id opt for a straight roller pin as the step seems to be the root / weak spot and cause of this common problem. Just ensure there is enough room in the big end to take a larger bush ; and if you havs to make another con rod to take the bigger big end make sure there is enough room/ clearance in the crank case .👍 Very naughtie of the seller removing all the inards 🤬 Hope you didnt pay much. Edited April 30, 2023 by Engine Doctor Quote Link to comment Share on other sites More sharing options...
J D 8 Posted April 30, 2023 Share Posted April 30, 2023 Purchased an Enya 40ss on the Fleabay the other day, described as good compression and good condition which it is. Photos looked good but were clever in that the missing exhaust bolt and broken off fuel nipple did not show. Still cheap enough at ££40 and snags easy for me to sort. Still a case of byer beware. Quote Link to comment Share on other sites More sharing options...
J D 8 Posted April 30, 2023 Share Posted April 30, 2023 Just ran the 40ss and going nicely.👌 Quote Link to comment Share on other sites More sharing options...
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