[AT] John Deere power unit

[Charlie V]

I will add that with my L, I timed mag by the book as Dean has laid out.
Then I checked it out against #1 piston position.  As I recall it was
almost 1/2 stroke from TDC.  Whoa.  That ain't gonna work too well.  I
retimed the Mag with #1 at TDC.  Then when I looked through the flywheel
peep hole I find that someone at some time hand scribed a line on the
flywheel within about two degrees from where I was at and marked it with a
zero.  Strange things can happen in 70 plus years.  Long story short, the
engine started easy and ran well with that timing.

Charlie V.

If the link below works, this is about what you want to hear.


http://www.youtube.com/watch?v=EA6l7qAgCqs


On Tue, Jul 9, 2013 at 8:40 PM, Dean VP <deanvp at att.net> wrote:

> Greg,
>
> Spark Plug Gap = 0.025"
> Point Gap 0.015"
>
> Timing Magneto:
>
> 1. Loosen timing Hole Cover screw and swing cover off timing hole
> 2.) Remove bakelite cover from end of magneto
> 3.) Rotate crankshaft slowly clockwise until magneto impulse occurs, then
> rotate
> counterclockwise until spark mark on flywheel appears in the timing hole
> and lines up with
> mark on centerline of timing hole.
> 4.) Examine magneto points. They should be just beginning to open at this
> point. If points
> are not beginning to open or are well open , loosen magneto attaching nuts
> and rotate top
> of magneto either outward to close points or inward to close points, until
> points just
> begin to open.  PS: The position of the rotor arm should be at about 17
> minutes to the
> hour when the points are beginning to open.
>
>
> If you find the magneto is way off I'll give the manual's instructions on
> how to start
> over by removing the distributor and re-installing it in the right
> position.
>
> There is also a section in the manual on how to time the valves and also a
> section on
> adjusting the tappets. Intake at 0.008" when cold and exhaust at 0.010"
> when cold. 0.002
> less when hot.
>
> Dean VP
> Snohomish, WA
>
> A gun is like a parachute. If you need one, and don't have one, you'll
> never need one
> again.
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com [mailto:
> at-bounces at lists.antique-tractor.com]
> On Behalf Of Dean VP
> Sent: Tuesday, July 09, 2013 4:28 PM
> To: 'Antique tractor email discussion group'
> Subject: Re: [AT] John Deere power unit
>
> Greg,
>
>   I have an original Operators Manual for the JD LUC engine OM-H11 dated
> 8-1946.
>
> I will dig it out and see if there is anything in there that can be of
> help.
>
>
>
>
> Dean VP
> Snohomish, WA
>
> A gun is like a parachute. If you need one, and don't have one, you'll
> never need one
> again.
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com [mailto:
> at-bounces at lists.antique-tractor.com]
> On Behalf Of Greg Hass
> Sent: Tuesday, July 09, 2013 3:48 PM
> To: Antique tractor email discussion group
> Subject: [AT] John Deere power unit
>
> 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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