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| My Mamod SE3+. |
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| Stilldrillin:
--- Quote from: shoey51 on May 05, 2009, 03:23:40 PM ---I must have been sleeping to miss this thread great job there David and beeing one that has actually seen your first engine I was mightily impressed. wont miss any more of these goings on thats for sure :) cheers Graham --- End quote --- Heyup Graham! Thanks for that..... :thumbup: Looking forward to seeing you and Jilly, seeing it again....... :D David D |
| Stilldrillin:
Continuing....... As mentioned, I made up a set of plastic pistons..... You all know about them....... ::) But, as I was installing them & reassembling the crankshaft, I noticed the loctite had let go in the centre crank. :scratch: Hmmmmm...... Cleaned up, restuck, rebuilt, reset...... 4 hours running at Lincoln..... Bit of a clonk, again! Whenever no1 cylinder "fires". The loctite`s gone again! :bang: Holding onto no1 & no3, the crank will twist! Also the centre crank can be moved up / down. Too much bearing play..... But, it is only a toy! Nowt for it, but to rebush the mains..... ::) I line drilled the first 3 bearings 13/64", but the drill was too short to reach no4...... Sooo..... I drilled a hole through a bolt & locknutted it to the drill, allowing me to hand drill through no4. Turned some brass bushes .1" long & loctited into place. All nicely in line. :thumbup: The top piece of crankshaft is original, & worn. I was surprised at the wear on the other 1/2 crankshaft, a piece of silver steel installed last year, worn -.003" or so! :bugeye: Nice shiney new silver steel shafts. Running in..... No wobble..... No clonk..... Fingers crossed..... Well I`ve ONLY got to sort the burner now......... ::) Incidentally....... I`ve had another idea about those pistons! :wave: To be continued...... |
| sbwhart:
Nice fix David look forward to next instalment Stew |
| bogstandard:
David, I think I mentioned to you that the pistons needed to be threaded onto the rod before being stuck with Loctite. PTFE is too slick to be held in a hole by itself. John |
| Stilldrillin:
--- Quote from: bogstandard on May 06, 2009, 03:36:18 AM ---David, I think I mentioned to you that the pistons needed to be threaded onto the rod before being stuck with Loctite. PTFE is too slick to be held in a hole by itself. John --- End quote --- Sorry John, I missed posting this pic on "Stainless Pistons"..... Finished at 5/16" dia o/d. They are screwed 1/8"bsw & loctited...... My present thoughts are to screw the original brass piston 1/4bsw. Less volume of ptfe. Less expansion...... David D |
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