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What is the proper main bearing installation procedure for Chrysler Hemi engines?

The AERA Technical Committee offers the following information regarding crankshaft main bearing installation procedures for 2003-’06 DaimlerChrysler 5.7L and 6.1L Hemi engines.

This procedure is for crankshafts previously removed from the cylinder block.

It is important to first clean all of the oil off the main bearing journals. Then, determine the maximum diameter of the journal with a 2"-3" micrometer. Measure at least at two locations 90° apart at each end of the journal (front to back on crank). The maximum allowable taper is .0004" (.008 mm) and maximum out of round is .0002" (.005 mm). Compare the measured diameter with the journal diameter specification (Main Bearing Fitting Chart). Select inserts required to obtain the specified bearing-to-journal clearance. Desired engine oil clearance is .0007"-.0029" (.020 – .074 mm).

The crankshaft main bearings are "select fit" to achieve proper oil clearances. For main bearing selection, the crankshaft counterweight has grade identification marks stamped into it. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4 and 5. Note: service main bearings are coded. These codes identify the size and color of the bearing.

Note: the main cap crossbolts (A-J) are torqued after final torque of the main cap bolts. Always use a new washer/seal on crossbolts.

After placing the crankshaft in the block, clean and oil all cap bolts. Install all main bearing caps (1).

Install all cap bolts and alternately tighten in two steps using the following sequence.

Step 1: Torque bolts to 20 ft.lbs. (27 Nm) in sequence.

Step 2: Turn main cap bolts an additional 90 turn°.

Step 3: Install the crossbolts (A-J) with new washer/gasket. Starting with crossbolt "A," torque each crossbolt to 21 ft. lbs. (28 Nm) torque.

Step 4: Repeat crossbolt torque procedure.

Are the two oil pressure relief valves on certain Navistar engines interchangeable?

The AERA Technical Committee offers an oil pressure relief valve caution on 1997-2004 Navistar 466E and 530E engines. These engines utilize two oil pressure relief valves in the engine and proper location is important.

There are two locations that use these valves, one is the side of the block and the other is the front of the engine. The valve that is located on the side of the cylinder block is actually called an oil pressure regulator and the one located in the front of the cylinder block is an oil pressure relief valve.

Simply by looking at them, it may be difficult to figure out which valve is which. Both valves look identical and can be easily installed in the wrong location. When looking at the valves, there should be an "FC" stamped on the face of the valve, which indicates that the valve is the oil pressure relief valve and should be installed in the front of the engine. The other valve is the oil pressure regulator valve and should be installed in the side of the cylinder block.

Figure 1 Hemi crossbolt torque sequence.

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