[AT] John Deere power unit

[Mike]

Sure sounds like a timing problem, hopefully some John Deere guys will 
jump in and help you out. Mike M
On 7/9/2013 6:47 PM, Greg Hass wrote:
> At an estate auction recently my brother bought a John Deere LUC power
> unit that had been on a pull type combine.  It was sold as is because
> the mechanic hired by the family to get everything running had been
> unable to get it started. The mechanic said that it had spark, but that
> an exhaust valve was stuck open but he ran out of time to go any
> further. After getting it home, my brother was able to get the valve
> working without removing the head. The gas bowel was leaking gas to bad
> to use but he was able to get a little smoke by squirting gas in the
> carburetor,but after fixing the bowel gasket; no fire. I helped him take
> apart the carburetor and we could tell the previous owner had never
> gotten it running, although it appears he tried as it had a new muffler,
> had been nicely painted, and he had made a new gas bowel gasket
> (unfortunately he made it out of corrugated cardboard,thus the leak.) A
> few days ago my brother installed a kit in the carb and cleaned it up.
> He has gotten some smoke out the exhaust and also actual fire out of the
> carb; the air cleaner is unhooked while he tries to get it started. I
> was there a couple of nights ago when he cranked it any we both think it
> is a timing problem (could be bad valves but we don't really think so at
> this point.) The problem is,at this point we have no idea of what the PO
> might have done. Did he have the mag out and got the timing off putting
> it back on, is the mag tilted wrong, are the wires reversed; or is the
> mag off half a turn? Also we don't understand this engine as to how it
> fires. Is it even or does it have that odd JD firing order; we have
> always been IH people but lately my brother has started jumping ship. My
> question to the list is this; any help on how to set the timing on this
> engine would be greatly appreciated.
>                   Greg Hass
>
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