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I was taught when in training never to use an electric drill as it could ruin the valve face, long time ago now but I think it was due to the speed it went at and how it was easy to cut too much off as a result. Might be wrong but eleccy drill was a big no no back in the day
Quote from: Oddjob on November 11, 2019, 08:53:02 PMI was taught when in training never to use an electric drill as it could ruin the valve face, long time ago now but I think it was due to the speed it went at and how it was easy to cut too much off as a result. Might be wrong but eleccy drill was a big no no back in the daySame here, taught that to run it continuous in one direction risked putting "tram tracks" in both components as the cutting particals weren't moved out of line. Method taught was oscillations with a lift out occasionally to redistribute the cut, resulting in smooth lapped surface. You could get those drill driven oscillating gearbox with sucker on then to convert drill rotation into the right movement to facilitate if you had a lot to complete too.
While I am getting bored, waiting for the cylinders to get bored, (see what I did there... haHAA), a good moment to revamp my cylinder head.A question about the valves:First of all, off course I've kept valves very neatly ordered per cylinder.Next, I've cleaned the valves with the wire brush (brass) and cloth, and the seats as well. Next I cleaned the set (valve and seat) by adding a light rubbing cleaning compound (just household cleaning, this stuff is way too light to actually cut any metal) to the valve and turning the valve in the seat (using a drop of machine oil and a rubber hose on the stem to connect to a drill.Result is a clean valve seat and uhmm. bum (?). the part that hits the seat at least.Next, I've checked for leaks by dropping the valves back in the head, and filling the combustion chamber with fuel.To my surprise, 4/8 are (slowly) leaking fuel. 2 exhaust valves and 2 intake valves.Is this to be expected? After all, the valves are only closed by gravity, and gravity doesn't affect these teeny tiny valves very much.Before putting in the time and effort of installing the springs to double check, I'd love to hear from your experiences.thanks in advance.(picture is obviously of before the cleaning, there is quite some carbon build-up on the exhaust valves).