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CB466f
MCTID:
Stick the Valve in an electric drill (cordless or mains) with a light spring behind it (between the valve guide and the reverse head of the valve) and 'Bobs yer Uncle' - done in no time and with minimal effort.
K2-K6:
--- Quote from: Oddjob on November 11, 2019, 08:53:02 PM ---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
--- End quote ---
Same 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.
paul G:
--- Quote from: K2-K6 on November 11, 2019, 09:08:01 PM ---
--- Quote from: Oddjob on November 11, 2019, 08:53:02 PM ---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
--- End quote ---
Same 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.
--- End quote ---
This is what I use but the velcro still needed ;D
Trigger:
--- Quote from: Erwin83 on November 11, 2019, 02:21:35 PM ---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).
--- End quote ---
Was the wire brush you used Brass or steel that is copper colour ? If it is steel then you may have damaged the faces. Easy way to clean valves is drop them in thinners for 24hr and the carbon will wipe off.
Lapping in valves is a final process after you are sure the seats have no pitting and the valve face is good and the valve is not bent. If a valve doesn't lap in after the first grind ( a minute ) then something is wong. A valve can appear to be seated on a leak test but, turn the valve 90, 180 degrees and it could leak.
I re grind the seats and re face the valves and it will only take me a couple of minutes to lap in as, I already have a good matching surfaces.
Erwin83:
They're brass. Nothing got damaged fortunately.
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