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I assumed it was a timing mark I wasn't familiar with, but the original post made sense - a mark for the timing, a mark for TDC.
I wonder...what is commonly wrong in these engines that is causing this discrepancy? Maybe it is that push rod, I'll look into that as well. And maybe an analog voltmeter works better, but I've not had a problem getting the points to open dead on with the S mark using my decent DVOM. My engine just doesn't want it set there. I hear knocking, see excess exhaust fumes and know it isn't right, no matter what it "should" be. I'm happy, Cub's happy. :) It's not that I doubt that Matt's method is correct, I just know that in my particular application it doesn't fly. Valve adjustment did fix the slight miss after warmup, though - I should note that. Intake was too tight by several thousandths, exhaust was too tight by just a hair. Feels like all I do is fix previous owner's "fixes".... So yeah, I'd check valve clearances too - after breaking in the engine it'd be a good idea anyway. |
So I pulled the motor and checked the keyway and the valves. Key was fine, the intake valve was about .002 to tight. Still didn't fix the issue. The flywheel definatly has a dc mark and an st which could be sp its a little worn. Anyways it'll only run on the dc mark. It runs better but not perfect. So it still drops in rpm and stalls if u put a load on the engine and hunts when u try to rev it back up so I thought ill reset the governor. Loosened the bolt start to turn the shaft and snap! I could hear something fall down to the oil pan. Not good.
Is this going to be a big pain to replace the gear and cross shaft? Curt |
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The Cross Shaft and governor gear are the "first" things to be put into a motor and the last things to come out due to their location. It's not a really bad job to break the engine down to get to them tho. If you get in that far, I would replace the governor gear, and put a new cross shaft and cross shaft bushing back in. Download the Kohler service manual located in the Tractor Technical library. It will show you how to disassemble the motor and the governor gear location. Here is a pic of my 12hp motor with the new gear installed. http://i210.photobucket.com/albums/b...r/DSC01897.jpg |
Ouch. I'm got a K301 sitting in the shed with that very problem (cross shaft tab). Since that was the first part I put in when I rebuilt my current K301, I figured it would just become a "buildable block". The rest is in really good shape I think.
On the timing issue, I have a set of points that just won't work with my engine. I think they might be Chevy points. They just won't open far enough IIRC. Bought from someone I will never buy parts from again. |
Yeah this really ticked me off, I don't even have 30 hours on the engine yet. Hopefully she'll come apart and go back together again quickly. I'd like to get it done this weekend, but we'll see. I wish I had the time to engineer an electronic adjustable rev limiter for the engine. I really like the pointslayer electronic ignition module I put on it sure would be nice to expand upon that.
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