Cummins N14 – Crankshaft – Installation - Diesel Engines Troubleshooting (2024)

The main bearing shells are three different widths. The narrow main bearing shells fit locations Nos. 2, 4, and 6. The wide main bearing shells fit locations Nos. 1, 3, and 5.
The widest main bearing shell fits the No. 7 location.

Caution: The upper main bearing shells have a groove and an oil hole to provide crankshaft lubrication. The lower main bearing shells do not. Both bearings are marked on the back to indicate the location and either standard (std.) or oversize (OS). The amount of OS is stamped on the back in U.S. customary inches.

The groove for the No. 7 shell is not in the center of the shell. The wider part of the No. 7 shell must be installed toward the flywheel end of the cylinder block.

NOTE: If used bearing shells are to be installed, each must be installed in its original location in the engine. The bearing journal numbers must have been marked on the bearing during disassembly.

Use a lint free cloth to clean the bearing and the mounting surface.

Align the ring dowel groove in the bearings with the counterbore in the cylinder block, and install the bearings.
Both ends of the bearing will be approximately 1.50 mm [0.060-inch] below the main bearing cap mounting surface when installed correctly.

Use clean Lubriplateா 105 or its equivalent to lubricate the upper bearing shells.

Use a lint free cloth to clean the crankshaft bearing journals.

The end of the crankshaft with the smallest diameter must point toward the front of the block. Install the crankshaft.

Use a lint free cloth to clean the thrust bearings, the main bearing shells, and the main bearing caps.

NOTE: If used thrust bearings are to be installed, each must be installed in its original location in the engine. The bearing journal numbers must have been marked on the bearing during disassembly.
Use clean Lubriplateா 105 or its equivalent to lubricate the upper thrust bearings.

Install the upper thrust bearings in the No. 7 main bearing saddle.
NOTE: Push the crankshaft toward the front of the engine to install the front bearing and to the rear of the engine to install the rear bearing.
The end of the thrust bearings must be even with the main bearing cap mounting surface.

Caution: Do not intermix the main bearing dowel ring and the main bearing capscrew washers. The hardened main bearing capscrew washer (1) is approximately 0.76 mm [0.030-inch] thicker than the soft main bearing dowel ring (2). Intermixing the capscrew washers and dowel rings will result in main bearing failure.

Install the dowel ring in the dowel ring counterbore of the cylinder block.
Install the lower main bearing shells as follows:
Use clean Lubriplateா 105 or its equivalent to lubricate the bearing shell to the crankshaft journal mating surface.

Align the dowel ring groove in the bearing with the dowel ring.

The dowel ring grooves (1) and (2) in the bearings must be engaged with the dowel ring (3).

Push on the side of the bearing shell opposite the dowel ring to install the bearing shell.

The end of the lower main bearing shell opposite the dowel ring must be engaged between the crankshaft and the cylinder block and be seated against the end of the upper bearing shell.
NOTE: If installed correctly, the ends of the bearing shells (1) will meet approximately 1.50 mm [0.060-inch] below the cylinder block main bearing mounting surface.

NOTE: If used thrust bearings are to be installed, each must be installed in its original location in the engine. The bearing journal numbers must have been marked on the bearing during disassembly.
Use clean Lubriplateா 105 or its equivalent to lubricate the lower thrust bearings.

Put the lower thrust bearings around the No. 7 main journal with the grooves facing the thrust surfaces on the crankshaft.
NOTE: The notch (1) on the outside diameter of the lower thrust bearings must align with the locating pins in the No. 7 main bearing cap.

Use clean 15W-40 oil to lubricate the capscrew threads and the flat washers.

Install the main bearing caps.
Align the capscrew holes in the cap with the holes in the cylinder block. Make sure the dowel ring and the lower bearing shell are in position.

Install the capscrews and the washers through the cap and into the cylinder block.
Use your hand to tighten the capscrews two to three threads.

Use both of the capscrews to pull the main bearing cap into position.
Use two wrenches. Tighten both of the capscrews at the same time.
Make sure the cap is touching the block. If it is not , check for a bearing out of location.

Tighten the main bearing capscrews in the sequence shown to the torque values listed in the two following steps:

Tighten the main bearing capscrews to the following torque values:
1. Tighten to 122 N•m [90 ft-lb].
2. Tighten to 230 N•m [170 ft-lb].
3. Tighten to 346 N•m [255 ft-lb].
4. Loosen completely.
5. Repeat steps 1 through 3.

After tightening all the main bearing capscrews, use your hands to turn the crankshaft. If it does not turn freely, loosen the main bearing capscrews one cap at a time.
This will help locate the bearing that is too tight.

Remove the main bearing cap and the bearing. Check for an incorrect or mislocated bearing or main bearing cap, an incorrect oversize bearing, or debris between the main bearing and the cap.

Tighten the main bearing capscrews in the sequence shown to the torque values listed previously in this procedure.

Measure the end clearance of the crankshaft.
Install a dial indicator to the rear face of the cylinder block.
Put the tip of the gauge against the end of the crankshaft.
Push the crankshaft toward the rear of the cylinder block.

Set the dial indicator to ‘‘0.’’ Push the crankshaft toward the front of the cylinder block. If the end clearance is less than 0.10 mm [0.004-inch], do the following:

Loosen the main bearing capscrews one turn.
Push the crankshaft toward the front and then toward the rear of the cylinder block.

Tighten the main bearing capscrews in the sequence shown to the torque values listed previously in this procedure.

Measure the crankshaft end clearance. The end clearance specification for a new or reground crankshaft with new thrust bearings is 0.10 mm [0.004-inch] to 0.45 mm [0.018-inch].

NOTE: Crankshafts that have been reground on the thrust bearing surfaces are marked for oversize thrust bearings on the rear crankshaft counterweight. If the crankshaft counterweight is marked, check the thrust ring part number to make sure the correct thrust ring size is used.
Example: F-.010 – Front 0.25 mm [0.010-inch]
Example: R-.020 – Rear 0.51 mm [0.020-inch]

If the crankshaft end clearance is more than 0.58 mm [0.023-inch], use oversize thrust bearings to adjust the end clearance to the correct specification.