COUPLING-EXHAUST 7N2277 - Caterpillar

Illustration 1 g01349782
Typical example
(1) Crankshaft gear
(2) Crankshaft
(3) Crankshaft thrust washers Maximum permissible temperature of the gear for installation on the crankshaft ... 180 °C (356 °F)The end play of a new crankshaft ... 0.17 to 0.41 mm (0.0067 to 0.0161 inch)Standard thickness of thrust washer ... 2.69 to 2.75 mm (0.1059 to 0.1083 inch)Oversize thickness of thrust washer ... 2.89 to 2.95 mm (0.1138 to 0.1161 inch)
Illustration 2 g01349784
Typical example
Table 1
The Undersize Diameter of the Crankshaft Journals
Dimension 0.25 mm (0.010 inch) 0.51 mm (0.020 inch) 0.76 mm (0.030 inch)
A 83.756 to 83.736 mm (3.2975 to 3.2967 inch) 83.502 to 83.482 mm (3.2875 to 3.2867 inch) 83.248 to 83.228 mm (3.2775 to 3.2767 inch)
B 71.746 to 71.726 mm (2.8246 to 2.8239 inch) 71.492 to 71.472 mm (2.8146 to 2.8139 inch) 71.238 to 71.218 mm (2.8046 to 2.8039 inch)
C 38.165 mm (1.5026 inch) 38.165 mm (1.5026 inch) 38.165 mm (1.5026 inch)
D 35.38 mm (1.3929 inch )maximum 35.38 mm (1.3929 inch )maximum 35.38 mm (1.3929 inch )maximum
E 35.5 to 35.7 mm (1.3976 to 1.4055 inch) 35.5 to 35.7 mm (1.3976 to 1.4055 inch) 35.5 to 35.7 mm (1.3976 to 1.4055 inch)
F Do not machine this diameter. Do not machine this diameter. Do not machine this diameter.
Table 2
Minimum Width of machined Area of Crankshaft Web
Web 1 2 to 9 10 and 11 12
25.11 mm
(0.9886 inch) 22.86 mm
(0.9000 inch) 23.15 mm
(0.9114 inch) 26.86 mm
(1.0575 inch) If necessary, machine the thrust face in order to remove damage. Refer to Table 2 for information.
Illustration 3 g01283112
(4) Journal #1
(5) Journal #2
(6) Journal #3
(7) Journal #4
(8) Journal #5
(9) Journal #6
(10) Journal # 7 Refer to Table 3 for the run out of the crankshaft journals.
Table 3
Journal Run Out of the Journals
(1) Mounting
(2) 0.05 mm (0.0020 inch)
(3) 0.1 mm (0.0039 inch)
(4) 0.15 mm (0.0059 inch)
(5) 0.1 mm (0.0039 inch)
(6) 0.05 mm (0.0020 inch)
(7) Mounting The radii of all the crankshaft journals must be machined. This machining must return the crankshaft to the original standard. The radii must give a smooth transition from the journal to the side machined face.
Illustration 4 g01283119
Typical example
The edge of the oil holes (11) must be machined to the original standard after machining of the crankshaft.Oil hole The maximum radius of the edge of the oil hole ... 0.5 mm (0.0197 inch)Surface finish of all journals ... Ra 0.2 micronsSurface finish of all radii ... Ra 0.4 micronsInspect the crankshaft for structural cracking after machining.Refer to the Specifications Module, "Connecting Rod Bearing Journal" topic for more information on the connecting rod bearing journals and connecting rod bearings.Refer to the Specifications Module, "Main Bearing Journal" topic for information on the main bearing journals and for information on the main bearings.