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My Mamod SE3+.
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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