Posted by KEB1 on December 25, 2008 at 19:38:55 from (63.231.76.249):
In Reply to: Re: My W6 won't run posted by trutherf on December 25, 2008 at 19:14:52:
The pause-snap motion on the rotor is the impulse on the magneto doing its thing. At cranking speeds the magneto isn't turning fast enough to generate much of a spark, so there's a spring mechanisms that holds the shaft for part of a turn and then releases it to "snap" to the next position, thereby turning fast enough to make a good spark.
If none of the valves are moving, then the camshaft isn't turning even though the camshaft gear is. You'll need to pull the timing gear cover to see what's going on. Sounds like you sheared a key where the cam gear mounts to the camshaft, or broke the camshaft itself. It'll never run like that.
Some of the valves are held in the open position by the camshaft. In a higher compression engine, you'd have had pistons banging into the open valves, and at the very least would have bent valves to deal with as well. However, I believe there's enough clearance in these engines to avoid that problem.
Don't bother checking compression. If the valves aren't opening and closing, you won't have any...
Time to pull the timing cover and take a look. Not a trivial undertaking. I have a WD-6 (diesel), and assume that getting to the timing cover on a gas engine would be similar. You'll have to remove the radiator along with all the front sheet meta just to get access to the front of the engine. I don't have my manual handy, so not sure what else would have to come off the front of the engine to get to the timing cover.
Might be time to call a mechanic if you're not real confident in your own abilities and/or don't have a good service manual, or really need the tractor right away.
I know this isn't what you want to hear, but you're looking at some relatively major engine work.
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