Model #247288820 Craftsman lawn, tractor

Question and Answers

Q:

Lawn Tractor Model Number 247.288820 247288820 Craftsman Tractor

A:

Thank you for your question and I understand your concern.

A. How to check valve adjustment.

1. Remove the rocker arm cover(s) (valve cover(s)).
2. Rotate the engine clock wise, by hand, until the engine is at TDC (Top Dead Center) on the compression stroke.
3. The piston will be at the top of the cylinder twice, during the four strokes of the engine.
I. To determine if the engine is at TDC, on the compression stroke, note the position of the valves, when the piston is at the top of the cylinder.
II. When both valves are closed, and the piston is at the top of the cylinder, the engine is at TDC and there will be no tension on the rocker arms and the valves will be in the closed position.
III. When the valves are on rock (exhaust stroke), the exhaust valve will be closing and the intake valve will be opening, the engine is not at TDC.
This can be determined by rotating the engine a quarter of a turn each direction.
If the engine is at TDC the valves will not move, if the engine is on rock, one valve will close as the other one opens.
4. With the engine at TDC, rotate the engine a quarter of an inch counter clockwise.
5. Using a feeler gauge, measure the distance (the gap) between the top of the valve and the contacting surface of the rocker arm.
6. The correct gap is .004 to .006 (4 to 6 thousands).
7. If the distance (the gap) between the valve and rocker arm is within specs, .004 to .006, no adjustment is needed.
8. If the distance (the gap) between the valve and rocker arm is not within specs, .004 to .006, adjustment is needed.

B. How to adjust valves

1. With the engine at TDC, rotate the engine a quarter of an inch counter clockwise.
2. Loosen the lock nut, locking the rocker arm, then turn the set screw in the center of the locking nut to obtain the proper distance (the gap) .004 to .006.
3. It is recommended to set the distance (the gap), more than the .004 to .006 to allow the rocker arm nut to be secured.
4. The setting must be .004 to .006 when the rocker arm nut is secured. It may be necessary to readjust until the proper setting is obtained.
5. Torque rocker arm lock nut to 45 inch pounds.

I hope this information is helpful.
 

Read More
Joey S -
Sears Technician
June 02, 2014