Yanmar 4BY, Service Manual, Page: 120 / 275

ENGINE
BY Service Manual 5-65
Cylinder Block and Crankshaft
Crankshaft Specifications
Main Bearing
Journals
Specification
Standard Yellow
59.977 - 59.983 mm
(2.3613 - 2.3615 in.)
Standard Green
59.970 - 59.976 mm
(2.3610 - 2.3613 in.)
Standard White
59.964 - 59.969 mm
(2.3608 - 2.3610 in.)
Undersize 1 (U 0.25)
Yellow 59.727 - 59.733 mm
(2.3514 - 2.3517 in.)
Undersize 1 (U 0.25)
Green 59.720 - 59.726 mm
(2.3512 - 2.3514 in.)
Undersize 1 (U 0.25)
White 59.714 - 59.719 mm
(2.3509 - 2.3511 in.)
Undersize 2 (U 0.50)
Yellow 59.477 - 59.483 mm
(2.3416 - 2.3418 in.)
Undersize 2 (U 0.50)
Green 59.470 - 59.476 mm
(2.3413 - 2.3416 in.)
Undersize 2 (U 0.50)
White 59.464 - 59.469 mm
(2.3411 - 2.3413 in.)
Crankshaft Bearing
Clearance, Radial 0.019 - 0.052 mm
(0.0007 - 0.0020 in.)
Connecting Rod
Journals
Specification
Standard
45.00 -0.009 / -0.025 mm
(1.7716 -0.0004 / -0.0010 in.)
Size 1
44.75 -0.009 / -0.025 mm
(1.7618 -0.0004 / -0.0010 in.)
Size 2
44.50 -0.009 / -0.025 mm
(1.7520 -0.0004 / -0.0010 in.)
Radial Bearing Play
0.015 - 0.050 mm
(0.0006 - 0.0020 in.)
Thrust Bearing Specification
Standard
25.00 +0.020 / +0.066 mm
(0.9842 +0.0008 / +0.0026 in.)
Size 1
25.2 +0.020 / +0.066 mm
(0.9921 +0.0008 / +0.0026 in.)
Size 2
25.4 +0.020 / +0.066 mm
(1.000 +0.0008 / +0.0026 in.)
Crank-
shaft End Play 0.06 - 0.25 mm
(0.0024 - 0.0098 in.)