10-23
HRX217HYA • HRX217HZA
CAM PULLEY/CRANKSHAFT/ PISTON/CYLINDER
VALVE SEAT RECONDITIONING
Thoroughly clean the combustion chamber and valve seats to
remove carbon deposits (
Apply a light coat of Prussian Blue or erasable felt-tipped marker
ink to the valve seat.
Insert the valve, and snap it closed against its seat several times.
Be sure the valve does not rotate on the seat. The transferred
marking compound will show any area of the seat that is not
concentric.
Measure the valve seat width of the cylinder head.
If the measurement is more than the service limit, recondition the
valve seat.
Check whether the valve seat contact area of the valve is too high.
If the valve seat is too high, recondition the valve seat.
Prepare a thick paper cylinder or equivalent material with a large
enough diameter to fit against the cylinder wall of the cylinder.
Insert the thick paper into the cylinder to protect the cylinder wall
during valve seat reconditioning.
Valve seat cutters/grinder or equivalent valve seat re-facing
equipment is recommended to correct a worn valve seat.
Turn the cutter clockwise, never counterclockwise. Continue to
turn the cutter as you lift it from the valve seat.
STANDARD:
0.7 – 0.9 mm (0.03 – 0.04 in)
SERVICE LIMIT:
1.8 mm (0.07 in)
VALVE SEAT
WIDTH
VALVE SEAT
TOO HIGH
THICK
PAPER
VALVE
SEAT
CUTTER
Summary of Contents for HRX217K6HYA
Page 3: ...ii NOTES ...
Page 35: ...2 28 SERVICE INFORMATION HRX217HYA HRX217HZA NOTES ...
Page 53: ...3 18 MAINTENANCE HRX217HYA HRX217HZA NOTES ...
Page 54: ...4 1 4 ROTO STOP DRIVE BELT 1 ROTO STOP 4 2 2 DRIVE BELT 4 10 ...
Page 66: ...6 1 6 MUFFLER 1 REMOVAL INSTALLATION 6 2 6 ...
Page 75: ...7 8 RECOIL STARTER HRX217HYA HRX217HZA NOTES ...
Page 91: ...8 16 FUEL SYSTEM HRX217HYA HRX217HZA NOTES ...
Page 131: ...10 26 CAM PULLEY CRANKSHAFT PISTON CYLINDER HRX217HYA HRX217HZA NOTES ...
Page 149: ...12 10 VARIABLE MOWING SYSTEM MOWER DECK WHEELS HRX217HYA HRX217HZA NOTES ...
Page 150: ...13 1 13 TRANSMISSION 1 REMOVAL 13 2 2 INSTALLATION 13 4 ...