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John T (Yo Clooney, u got more to help here?)
11-20-2002 07:30:34
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Re: Crank Timing in reply to Jim, 11-19-2002 16:41:11
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Jim, well no one else is hitting on this lol so I will at least discuss it. If you absolutely can not find a mark or punch on the crank gear, I have timed cam to cranks before, simply by looking at where what valves were at the proper time, but Im sure you can figure that withiout any advice. I would study number one left cylinder and see if you can time the crank to where the intake valve opens when the piston just starts down on its intake stroke, and is totally closed, of course, when it gets to the bottom. Then as you know, the piston will come back to top (no valves will open or be open) and go all the way back down (and just start back up) before the exhaust valve opens, which is then, again of course, closed at top. If it does all that, you are surely within a gear tooth of being right. Then, when the left piston is at TDC on its power compression stroke, the governor to cam gear is timed so its female drive cog slot (that mag fits into and is driven) should be flat horizontal. Other timings are the clutch disk versus the flywheels placement on the correct splines. They often have a v mark or a dot that lines up. If you get the flywheel on the right spline, its LH Impulse mark should be horizontal at 3 O Clock lined up with a mark on side of tractor when left piston is at TDC on compression stroke. Other thigns regardign timing are the clutch disks and flywheels heavy out of balance sides MUST be 180 opposite from each other to avoid serious vibration. This is about all the smarts I have concernign the subject, and as Forrest Gump says, Thats all I have to say about that. Good luck, Ol John T
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