Centinel System – Repair Manual – 001-006   Bearings, Main

CAUTION  The cylinder block saddle and the cap mating surfaces must be clean and dry when the bearing shells are installed. Used bearings must be installed in their original location or engine damage can occur.

CAUTION  The bearing tang must fit into the slot in the bearing saddle or engine damage can occur.

CAUTION  Do not use a capscrew or any hard metal object to install bearings, as this can damage the crankshaft and cause an engine failure.

Use clean Lubriplate™ 105 multi-purpose lubricant, or its equivalent, to lubricate the upper main bearing shell to crankshaft journal mating surface.

Start the bearing into the upper saddle by hand. Slide the bearing into position. Take care to
not damage the crankshaft journal while installing the bearing.

Use clean Lubriplate™ 105 multi-purpose lubricant, or its equivalent, to lubricate the inside diameter of the bearing shells and the liner side of the upper thrust bearings.

Align the lower main bearing shell and push it into place.

CAUTION  Make sure the bevel side is toward the crankshaft journal. Incorrect thrust bearing installation will result in engine damage.

Use clean Lubriplate™ 105 multi-purpose lubricant, or its equivalent, to lubricate the liner side of the lower thrust bearings.

Install the lower thrust bearings in the number four main bearing cap as shown.

CAUTION  Make sure the bevel side is toward the crankshaft journal. Incorrect thrust bearing installation will result in engine damage.

Install the upper thrust bearings in the number four main bearing saddle.

Push the crankshaft toward the rear of the engine to install the front thrust bearing and toward the front of the engine to install the rear thrust bearing.

CAUTION  Only use Loctite™ 518 thread sealant on the main cap joint mating surface. Other sealants can become hard, brittle, and allow oil and debris into the main bearing/block joint, causing engine damage.

CAUTION  The bead must be 3 to 5 mm [0.12 to 0.20 in] wide and must not enter the main bearing shell inside the main bearing shell inside diameter. Sealant in the main bearing can cause engine damage.

Apply a bead of Loctite™ 518 thread sealant to the two main bearing cap surfaces on each main bearing cap as shown.

Use clean 15W-40 engine oil to lubricate the capscrew threads and flat washers (or the underside of the capscrew heads if washers are
not used).

Drain the excess oil from the capscrews before installing them.

CAUTION  The main bearing caps are marked with a `V.’ Position the `V’ mark so that it points to the front of the engine. Incorrect positioning will result in severe engine damage.

Align the capscrew holes in the cap with the holes in the cylinder block. Make sure the lower bearing shell is in position.

Install the capscrews through the cap and into the cylinder block.

To reduce the possibility of bore size issues, clearance issues, or both, the main bearing capscrews
must be tightened within 15 minutes of the Loctite™ 518 thread sealant application.

Make sure the bearing shell does
not move.

Tighten the capscrews in far enough to use a heel bar to pry the caps into place.

Tighten both of the capscrews on a main bearing cap to 203 N•m [150 ft-lb].

Loosen both capscrews completely.

The remaining main bearings do
not have thrust bearings.

It is recommended to use an air impact wrench and socket, Tool Numbers 3163059 and 3163060, to rotate the capscrews an additional 180 degrees.

Use the torque plus angle method to tighten the main bearing capscrews in the sequence shown.

To measure the end clearance of the crankshaft, install a dial indicator onto the oil pan flange.

Place the tip of the gauge against the crankshaft counterweight.

Push the crankshaft toward the rear of the cylinder block.

Set the dial indicator at “0” (zero).

Push the crankshaft toward the front of the cylinder block.

If the end clearance is less than 0.10 mm [0.004 in], loosen all 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 sequence.

Block Main Bearing Capscrews

Measure the crankshaft end clearance.

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: F0.010 = front 0.25 mm [0.010 in]

Example: R0.020 = rear 0.51 mm [0.020 in]

If the crankshaft end play is more than 0.50 mm [0.020 in], the engine
must be removed to allow for replacement of the crankshaft.
Refer to Procedure 000-001 (Engine Removal) in Section 0.