TK 3.88 Diesel Engine Specifications (Rev 1/97)
15
Piston, Piston Rings, and Wrist Pin (continued)
Piston Ring Groove Width
Top Ring Groove .0616-.0622 in .(1.565-1.580 mm)
Middle Ring Groove .0598-.0604 in. (1.520-1.535 mm)
Bottom Ring Groove .1382-.1388 in. (3.510-3.525 mm)
Piston Ring Width
Top Ring .0579-.0587 in. (1.470-1.490 mm)
Middle Ring .0579-.0587 in. (1.470-1.490 mm)
Bottom Ring .1366-.1374 in. (3.470-3.490 mm)
Piston Ring to Ring Groove Clearance
Top .0030-.0043 in. (0.075-0.110 mm) .0079 in. (0.200 mm)
Middle .0012-.0026 in. (0.030-0.065 mm) .0079 in. (0.200 mm)
Bottom .0008-.0022 in. (0.020-0.055 mm) .0079 in. (0.200 mm)
Piston Ring End Gap
Top Ring .004-.010 in. (0.10-0.25 mm) .059 in. (1.50 mm)
Middle Ring .010-.016 in. (.025-.040 mm) .059 in. (1.50 mm)
Bottom Ring .006-.014 in. (0.15-0.35 mm) .059 in. (1.50 mm)
Wrist Pin Bore Inside Diameter .8268-.8271 in .(21.000-21.009 mm) .8276 in. (21.020 mm)
Wrist Pin Outside Diameter .8264-.8268 in .(20.991-21.000 mm) .8258 in. (20.975 mm)
Wrist Pin to Wrist Pin Bore Clearance 0-.0007 in. (0-.018 mm) .0018 in. (0.045 mm)
Connecting Rod
Wrist Pin Bushing Inside Diameter .8278-.8283 in .(21.025-21.038 mm) .8307 in. (21.100 mm)
Wrist Pin to Wrist Pin Bushing
Clearance .0010-.0019 in .(0.025-0.047 mm) .0043 in (0.110 mm)
Side Clearance (Crank to Rod) .008-.016 in .(0.20-0.40 mm) .022 in. (0.55 mm)
Twist per 4 in. (100 mm) .002 in. (0.05 mm) .003 in. (0.08 mm)
Parallelism per 4 in. (100 mm) .002 in. (0.05 mm) .003 in. (0.08 mm)
Crankshaft and Crankshaft Bearings
Main Journal Outside Diameter
Standard 1.7311-1.7315 in. (43.970-43.980 mm) 1.7291 in. (43.920 mm)
Undersize 1.7213-1.7217 in. (43.720-43.730 mm) 1.7193 in. (43.670 mm)
Main Bearing Inside Diameter
Standard 1.7323-1.7339 in. (44.000-44.042 mm) 1.7350 in. (44.070 mm)
Undersize 1.7224-1.7241 in. (43.750-43.792 mm) 1.7252 in. (43.820 mm)
Main Bearing Clearance .0008-.0028 in .(0.020-0.072 mm) .0059 in. (0.150 mm)
Rod Journal Outside Diameter
Standard 1.5736-1.5740 in. (39.970-39.980 mm) 1.5717 in. (39.920 mm)
Undersize 1.5638-1.5642 in. (39.720-39.730 mm) 1.5618 in. (39.670 mm)
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