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78762, LW-10207, LW-10208 pistons indicates the piston weight is within the limits specified for any group of pistons *=HighCompression.
and may be substituted for any like piston on a particular engine. Other pistons are manufactured within weight limits
Cylinder Barrel: N=nitride hardened, C=chrome plated. that do not require any weight controlled piston for
replacement. To find the average out-of-round, measure diameter of cylinder in an area 4" above bottom of barrel: First, measure Piston diameter at top is measured at top ring land (between diameter at right angles from plane in which valves are top and second compression ring grooves) at right angle to located. Second, measure diameter through the plane in piston pin hole; diameter at bottom of piston is measured at whichvalves are located. Difference betweendiametersmust the bottom of the piston skirt at right angles to the piston not exceed .0045 inch. pin. See Service Instruction No. 1243 for illustration.
SERVICE TABLE OF LIMITS
PART IV VERTICAL ENGINES
SECTION II CYLINDERS
Ref. Ref. Chart New Old
Nomenclature
Exhaust Valve Seat and Cylinder Head (Flat Seat)
Exhaust Valve Seat and Cylinder Head (Allison Seat)
0. D. Exhaust Seat (Allison Seat)
0. D. Exhaust Seat (Flat Seat)
I. D. Exhaust Seat Hole in Cylinder Head (Allison Seat)
I. D. Exhaust Seat Hole in Cylinder Head (Flat Seat)
Intake Valve Seat and Cylinder Head
0. D. Intake Seat (Allison Seat)
0. D. Intake Seat (Flat Seat)
0. D. Intake Seat
I. D. Intake Seat Hole in Cylinder Head (Allison Seat)
I. D. Intake Seat Hole in Cylinder Head (Flat Seat)
I. D. Intake Seat Hole in Cylinder Head
Exhaust Valve Guide and Cylinder Head
0. D. Exhaust Valve Guide (1/2 in. Exhaust Valve)
0. D. Exhaust Valve Guide (7/16 in. Exhaust Valve)
I. D. Exhaust Valve Guide Hole in Cylinder Head (1/2 in. Exhaust Valve)
I. D. Exhaust Valve Guide Hole in Cylinder Head (7/16 in. Exhaust Valve)
Intake Valve Guide and Cylinder Head
0. D. Intake Valve Guide
Dimensions Mfr. Min. & Max. Serv. Max. Mfr. Min. & Max. Serv. lax.
.0065T .O1OT (A)
.0075T .O11T (A)
1.9355 1.937
2.0965 2.098
1.926 1.928
2.088 2.090
.0065T .010T (A)
2.1675 2.169
2.3145 2.316
2.2885 2.290
2.159 2.161
2.306 2.308
2.280 2.282
.OO1T .0025T (A)
.6633 .6638
.5933 .5938
.6613 .6623
.5913 .5923
.001T .0025T (A)
.5933 .5938
SERVICE TABLE OF LIMITS
PART IV VERTICAL ENGINES
SECTION II CYLINDERS
Ref. Ref. Chart Nomenclature Dimensions Clearances
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