Re: Setting Valves

Posted by Jim Allen on March 23, 2006 at 02:53:15 from (209.173.160.22):

In Reply to: Setting Valves posted by Donny on March 23, 2006 at 01:13:34:

Donny,

I haven't worked on a great many tractors but I've adjusted the
valves on a bazillion cars and trucks. I have an 826 and recently
adjusted the valves the way I outline below. I suspect you were
out of sequence. so I would either double check yourself or use
my method below. Anyway, there is another way to do it. I don't
say its better than the way the book says, but I find it less
confusing and I'm just plain used to it!

Go by the firing order. To make it easier to grasp the concept,
on a scrap of paper, draw a circle. Put a big dot in the center.
Equally spaced around that circle in a clockwise rotation, write
down the firing order of the engine: 153624. Now draw lines
connecting the cylinders in the firing order that are directly
opposite: 1-6, 5-2, 3-4, making sure that line intersects the dot
in the center. The cylinders opposite each other share the same
piston position at any point in the engine rotation, but the valves
are 180 degrees apart in the firing order.

Next, spin the engine around in clockwise rotation, watching the
rocker arms until you find two rockers on any cylinder at the
overlap point. Overlap is when one rocker is coming back up
(exhaust valve closing) and the other is just starting down
(intake opening). Move the engine until you find that center
point between the one coming up and the other starting down.

Next, find the cylinder opposite the one on overlap and adjust
the valves because that cylinder is on Top Dead Center and the
ignition point where the engine would fire. The lifters are on the
base circles of the cam.

Say you found #2 on overlap ... you would adjust the valves on
#5. Now that you have found which cyinder is on TDC, you know
that if you rotate the engine clockwise, #3 will be the next
cylinder in the firing order to go to TDC and fire, so watch the
rockers on #4 for the overlap point. When you reach it, adjust
the vlave on #3. Continue around until you have adjusted the
valves on all cylinders. You will make one full engine rotation
from the point you started in 60 degree increments.

CAUTION: Always turn the engine in the normal rotation
(clockwise for most) because some injection pumps can be
ruined going backwards a substantial distance. I don't actually
know if this is the case with the pump on the 826, hence my
caution. I'd prefer not to put my injection shop tech's kids
though college needlessly! Also, I made sure the engine kill rod
was pulled out and secured that way so that it wouldn't
accidentally start. It isn't likely, but I had it happen on a boat
engine of mine while I was spinning it over to adjust the valves.

I won't argue with anyone whether this is easier or harder than
the way in the manual. You turn the engine the same amount,
but in shorter distances. I just find it easier to keep it all straight
in my head .

Replies:

• Re: Setting Valves Donny 07:44:04 03/23/06 (0)

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