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#1
05-12-2021, 04:50 PM
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CH18S Oil leak - source? 1864 W/CH18S
Hey guys:
Trying to get my 1864 running. Got it running with new head gaskets, valves, etc, plus coils. Now with it running (just sitting on the frame) for a minute I get a pool of oil under the flywheel. I pulled the flywheel thinking the new seal must be cockeyed, but it looks straight and dry. All the oil is on the starter side of the flywheel, from about 1:00 (lower cyl. fines) to 5:00 and dripping from there. The inside of the flywheel is dry, which would seem to preclude a main seal leak. Is there anywhere else in this area that could be spitting oil, and maybe transferring? Suggestions welcome. Photo doesn't show the oil, but might help visualize it. I'm going to remount the flywheel and run it while we look for oil. 
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#4
05-13-2021, 10:36 AM
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not the valve cover
Not the valve covers, which do have molded gaskets, more like O-rings.
The breather cover is in the center of the vee, in front of the carburetor. It has an oil sensor screwed into it, and is held down by four bolts. Roughly rectangular. The Kohler manual said to use silicone on one side only, which I did. It leaked. Now it's sealed with Aviation Permatex. I don't think it will leak anymore.
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#5
05-13-2021, 03:20 PM
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Gotcha, I know you said breather cover in front of the carb, I just couldn't visualize that and was only thinking about my old style valve covers that were prone to leaking.
Glad you got it fixed and one more step closer to getting your 1864 going. Keep us posted on your progress, I'm particularly interested since I have an 1864 too.
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