Detroit Diesel MBE 4000 Service Manual page 174

1.17 PISTON, PISTON RING, AND CONNECTING ROD
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bore) to the center of the bushing (small-end bore). The measurement must be within
255.970 to 256.030 mm (10.0775 to 10.0799 in.).
[b] Measure the difference in axial parallelism (Dimension B in see Figure 1-98) between
the bearing bore and the inner surface of the bushing, at 50 mm (2 inches) from the
connecting-rod centerline (Dimension C in see Figure 1-98). The maximum allowed
difference is 0.030 mm (0.0012 inch).
[c] Measure the diameter of the connecting rod basic bore, with the bearing shells
removed. The diameter of the basic bore must be between 99.000 to 99.022 mm
(3.8976 to 3.8985 in.).
[d] Measure the maximum permissible out-of-round in the bearing bore, with the bearing
shells removed. The maximum permissible is 0.01 mm (0.0004 in.).
5. Calculate the connecting rod end play, or axial play, (fore-to-aft movement) on the
crankshaft.If the end play is less than 0.130 mm (0.0051 inch), or more than 0.292 mm
(0.0115 inch), replace the connecting rod. Listed in Table 1-28.
[a] For each bearing journal, note the width (thickness) of the bearing journal. Example:
W = 1.8120 inches.
j
[b] For each connecting rod, note the width (thickness) of the rod.
Example: W
[c] From the value for the journal width, subtract the value for the connecting rod width.
This result is the end play. Example: W
6. Remove the bolts and bearing cap when ready to install the piston.
7. Install the piston. Refer to section 1.17.2.
1.17.3.3 Connecting Rod Radial Play Measurement
Measure the connecting rod radial play as follows:
1. Remove the piston. Refer to section 1.17.1.
2. Using a chamois cloth, clean the bearing bores in both the connecting rod and the bearing
cap.
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= 1.8050 inches.
r
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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—W = 0.0070 inch.
j r
All information subject to change without notice.
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