1-S48
L4400 , WSM
ENGINE
Valve Recessing
1. Clean the cylinder head surface, valve face and valve seat.
2. Insert the valve into the valve guide.
3. Measure the valve recessing with a depth gauge.
4. If the measurement exceeds the allowable limit, replace the
valve.
5. If it still exceeds the allowable limit after replacing the valve,
replace the cylinder head.
W10768800
Clearance between Valve Stem and Valve Guide
1. Remove carbon from the valve guide section.
2. Measure the valve stem O.D. with an outside micrometer.
3. Measure the valve guide I.D. with a small hole gauge, and
calculate the clearance.
4. If the clearance exceeds the allowable limit, replace the valves.
If it still exceeds the allowable limit, replace the valve guide.
W10311740
Valve recessing
Factory spec.
0.05 (protrusion) to
0.15 (recessing) mm
0.0020 (protrusion) to
0.0059 (recessing) in.
Allowable limit
0.40 (recessing) mm
0.0157 (recessing) in.
(1) Cylinder Head Surface
(A) Recessing
(B) Protrusion
Clearance between
valve stem and valve
guide
Factory spec.
0.040 to 0.070 mm
0.00157 to 0.00276 in.
Allowable limit
0.10 mm
0.0039 in.
Valve stem O.D.
Factory spec.
7.960 to 7.975 mm
0.31339 to 0.31398 in.
Valve guide I.D.
Factory spec.
8.015 to 8.030 mm
0.31555 to 0.31614 in.
KiSC issued 07, 2007 A
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland
