The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
Manxmodder:
That's great progress,Brian.
Nice to see the scale of the motor compared to your hand,I look forward to more of your posts in the near future......OZ.
Brian Rupnow:
I haven't abandoned ship--Just been very busy. This afternoon I made up the knurled adjuster knobs that fit on the ends of the camshafts, but then found out I was out of #8 socket head capscrews of the correct length. I stuck two in the place that the much shorter ones will go in when I get them. On the right you can see the true meaning of "Make it up as you go." I forgot to lap the valves, and cut the long piece of parent metal off that I generally use for a handle when lapping the valves and seats together. So---I made up a pair of extended 1/4" "handles", counterbored them 1/8" to suit the valve stems, and cross drilled them together with a 1mm (.039") drill for a drive pin to connect them. The valves needed to be cross drilled anyways, so it kills two birds with one stone. I will lap the valves tomorrow and start the final assembly of everything.
Brian Rupnow:
This morning I got up early and lapped both of the valves into the seats. I first lapped them with 400 grit carborundum paste, then after a good cleaning, lapped them again with 600 grit. Everybody seems to do this a different way. In an earlier post you will see the "handles" that I attached to the valve stems. (Normally I leave the parent material from which the valves are cut long enough to be a "handle" and then cut it off after lapping is completed). The valve seat and valve face are coated with the carborundum paste (it doesn't take very much) and then the "handle" is gripped between my thumb and finger and revolved back and forth while pulling the valve into the seat. I do this ten times back and forth, then lift the valve off the seat,rotate it a quarter turn, and then repeat. I do this a total of ten times. Never use a power tool to do this. This is a job for "finger twiddling" only. After a thorough cleaning of both valves and seat areas, the valve springs and brass keepers were installed and the .039" cross pins installed. This as a job that always makes me wish for a third arm and hand, but I manage with the two I have. I am now at the point where I can't really go any further until I can buy a tube of Molycote grease tomorrow for the big end needle bearing. (Do you suppose turkey grease would work?--It's thanksgiving here today.) The valves open and close very nicely, which is always pleasing to see. I hear my wife up now preparing a feast for hoards of children and grand children, so being a firm believer in self preservation I had better get upstairs out of my machine shop and help her.--All you other Canadians following this thread---Happy Thanksgiving!!!---Brian
dsquire:
Hi Brian
Looks like your getting close to the end on this one and it's looking good.
;Have a good Thanksgiving with family and friends. :D :D
Cheers :beer:
Don
Brian Rupnow:
Thanks Don---
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