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Did you in fact find some seals made from Viton as Bob suggests or are they like what I have in the photo ? |
seals
yes they are close enough seals are seals and we only run 2700 rpm as long as you have room for the seal at max lift on the valve if not it will smash the seal
good luck |
Viton seals
![]() ![]() Found some Viton stem seals today at the local cylinder head re-manufacturer for 20 bucks. These ones fit snugly over the guide so I decided to go with them. To get the valve springs off I made a fitting for the lower plug hole and pumped compressed air into the cylinder with the piston at the bottom of its travel and both valves closed. This held the valve up nicely while I removed the springs and collets with a modified spring compressor tool thats used on cars. It all worked a treat and took less than 15 minutes per cylinder to do. Now to see if my $20 investment makes any difference to the oil consumption or not :D Cheers Graham |
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So what was the outcome of the addition of the oil seals on your engine? Charlie |
OIL CONSUMPTION
ALL THE ENGINES I HAVE HAD EXPERIENCE WITH WILL USE THE FIRST 1 TO 3 QUARTS RAPIDLY UNTIL IT FINDS THE LEVEL IT LIKES. AND THEN THE CONSUMTION STABILZES YOU MAY HAVE THE SAME ISSUE. LYCOMING EVEN AGREES WITH THIS YOU DO NOT HAVE TO KEEP THE OIL SUMP FULL
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The lycoming flyer you reference says use AD oil for break in on the "H" engine, or am I missing something?
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I have flown about 40hrs since fitting them and can only see a small reduction in consumption. They certainly didn't fix the problem totally. I think the cylinders are probably near the outer limits as mentioned in one of the previous posts. I will probably run them a while longer and change them out with new cylinders if consumption increases. |
Are the combustion chambers wet with oil? If the cylinders are burning the oil they will be wet. If not then the cylinders aren't the cause of the consumption.
Cylinders can be in limits, but as said, what limits. You need to keep the ring gaps in the new limit range and the skirt clearance at less then .012. Good Luck, Mahlon "The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk." |
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Cheers Graham |
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