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42hW-201601
CHAPTER 2 ENGINE 3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
VALVE SHEET
▶
Modifying the valve sheet
- When modifying the valve sheet, if necessary,
replace the valve guide.
- Modify the sheet width and sheet angle according
to the specification by special tools or valve
grinder.
•
INTAKE VALVE
SEAT ANGLE
EXHAUST VALVE
SEAT ANGLE
60° 45°
If the valve’s difference is more than limit, replace
the valve sheet.
SPECIFICATION 0.7 mm
LIMIT 1.0 mm
K20W258A
K25W286A
Stem seal assembling quality affects to oil
consumption.
•
CAUTION
VALVE SPRING
▶
Squareness, free-length, transformation, etc. of
valve spring are direct cause of damage such as
valve stem uneven wear, etc. Therefore check
certainly it when disassembling.
If the measurement value is over the limit, replace
ITEM SPECIFICATION LIMIT
Free length (A) 46 mm -
Inclination (B) - 1.2 mm
Spring load 12.2 kg / 39.6 mm -
K20W260A
CYLINDER HEAD ASSEMBLY
▶
Clean the cylinder head.
Replace the new valve stem seal and assemble
the stem seal to the valve guide by special tool
1.
2.
Assemble the valve after putting the oil on valve
stem and valve guide.
Assemble the valve spring and valve retainer.
Assemble the valve cotter by special tool.
Beat it slightly by Urethane hammer and check it.
3.
4.
5.
6.
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