TK 3.88 Diesel Engine Specifications (Rev 1/97)
14
Valve Train (continued)
Standard Dimensions
Wear Limit
Valve Seat Width
Intake
0.57 in. (1.44 mm)
.078 in. (1.98 mm)
Exhaust
.070 in. (1.77 mm)
.089 in. (2.27 mm)
Push Rod Length
5.551-5.591 in. (141.00-142.00 mm)
Rocker Arm Bushing Inside Diameter .4724-.4732 in. (12.000-12.020 mm)
.4760 in. (12.090 mm)
Rocker Arm Shaft Outside Diameter
.4711-.4718 in. (11.966-11.984 mm)
.4707 in. (11.955 mm)
Rocker Arm Bushing to Rocker Arm
Shaft Clearance
.0006-.0021 in. (0.016-0.054 mm)
.0053 in. (0.135 mm)
Tappet Outside Diameter
.8239-.8252 in. (20.927-20.960 mm)
.8240 in. (20.930 mm)
Tappet Bore Inside Diameter
.8268-.8276 in. (21.000-21.021 mm)
.8287 in. (21.050 mm)
Tappet To Tappet Bore Clearance
.0016-.0037 in. (0.040-0.094 mm)
Camshaft
Cam Lobe
1.3366-1.3406 in. (33.950-34.050 mm) 1.3287 in. (33.750 mm)
Camshaft Journal
Timing Gear End
1.5724-1.5732 in. (39.940-39.960 mm) 1.5689 in. (39.850 mm)
Middle
1.5713-1.5722 in. (39.910-39.935 mm) 1.5689 in. (39.850 mm)
Flywheel End
1.5724-1.5732 in. (39.940-39.960 mm) 1.5689 in. (39.850 mm)
Camshaft Bearing Inside Diameter
Timing Gear End Bearing Insert
1.5748-1.5774 in. (40.000-40.065 mm) 1.5787 in. (40.100 mm)
Middle Bearing
1.5748-1.5758 in. (40.000-40.025 mm) 1.5787 in. (40.100 mm)
Flywheel End Bearing
1.5748-1.5758 in. (40.000-40.025 mm) 1.5787 in .(40.100 mm)
Camshaft Journal to
Camshaft Bearing Clearance
Timing Gear End
.0016-.0049 in. (0.040-0.125 mm)
Middle
.0026-.0045 in. (0.065-0.115 mm)
Flywheel End
.0016-.0033 in. (0.040-0.085 mm)
Camshaft Deflection
.001 in. (0.02 mm)
Camshaft End Play
.002-.006 in. (0.05-0.15 mm)
.016 in. (0.40 mm)
Piston, Piston Rings, and Wrist Pin
Piston Outside Diameter Measuring
Point (From Bottom of Piston)
.31 in .(8.0 mm)
Piston Outside Diameter
Standard
2.8316-2.8328 in. (71.922-71.952 mm) 2.8272 in. (71.810 mm)
1st Oversize
2.8414-2.8426 in. (72.172-72.202 mm) 2.8370 in. (72.060 mm)
2nd Oversize
2.8513-2.8524 in. (72.422-72.452 mm) 2.6469 in. (72.310 mm)
Piston to Cylinder Wall Clearance
.0019-.0043 in. (0.048-0.108 mm)