Standard Procedure - Main Bearing Replacement

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Main Bearing Identification

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The main bearings are serviced in-vehicle. They must be replaced one-at-a-time in order to properly support the crankshaft. The upper and lower main bearing shells are NOT interchangeable. The upper and lower main bearings are "select fit" to achieve proper oil clearances. Refer to STANDARD PROCEDURE .

Fig 2: Driveline Support Fixture

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Disconnect and isolate the negative battery cable.
Position (special tool #8534B, Fixture, Driveline Support) (1) over the engine bay.

Fig 3: Engine Support Fixture & Adapters
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Install Adapters 8534-11(3) and 8534-13 (2) between the Engine Support Fixture 8534B (1) and the engine front cover. Carefully lift the engine to remove weight from both right and left engine mount isolators.

Fig 4: Left Engine Mount Isolator & Fasteners
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Remove the left engine mount isolator (1). Refer to INSULATOR, ENGINE MOUNT, LEFT, REMOVAL .

Fig 5: Right Engine Mount Isolator & Fasteners
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Remove the right engine mount isolator (1). Refer to INSULATOR, ENGINE MOUNT, RIGHT, REMOVAL .

Fig 6: Main Bearing Cap Bolts From Windage Tray Removal Sequence
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Remove the oil pan, oil pump pick-up and engine oil pump. Refer to PUMP, ENGINE OIL, REMOVAL .
Remove the eight main bearing cap bolts from the windage tray in the sequence shown in illustration and remove the windage tray (1).

Fig 7: Main Bearing Tie Bolts Removal Sequence
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NOTE:
Typical V6 engine configuration shown in illustration.
Remove the eight main bearing tie bolts in the sequence shown in illustration.
CAUTION:
DO NOT use a number stamp or a punch to mark main bearing caps, as damage to main bearings could occur.

NOTE:
Main bearing caps are not interchangeable and are marked to insure correct assembly.
Mark the main bearing cap positions using a permanent ink marker or a scribe tool.

Fig 8: Main Bearing Caps, Bolts, Crankshaft & Engine Block
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NOTE:
Typical V6 engine configuration shown in illustration.

CAUTION:
Replace only one main bearing at a time while all other main bearing caps remain properly tightened. If all main bearing caps are removed, the weight of the unsupported crankshaft will damage the crankshaft oil seals.

NOTE:
Replace the main bearings in the following order; 2, 3, 1, 4.
Remove the two cap bolts (2) and remove the main bearing cap (1).
When removing the No. 2 bearing cap, also remove the thrust washers (5).
Slide the upper main bearing half (6) out from between the crankshaft and the engine block.
If required, select fit new main bearings to the engine block. Refer to STANDARD PROCEDURE .
Lubricate the upper main bearing half (6) with clean engine oil and slide the bearing into position.

Fig 9: Thrust Washer Installation
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NOTE:
Typical V6 engine configuration shown in illustration.
When installing thrust washers (1) at the No. 2 main bearing location, use the following procedure:
1. Move the crankshaft forward to the limit of travel. Lubricate and install the front thrust washer (1) by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface.
2. Move the crankshaft rearward to the limit of travel. Lubricate and install the rear thrust washer by rolling the washer onto the machined shelf between the No. 2 upper main bulk head and crankshaft thrust surface.
Fig 10: Checking Cylinder Head Bolts For Stretching (Necking)
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CAUTION:
The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.
Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.

Fig 11: Main Bearing Caps, Bolts, Crankshaft & Engine Block
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NOTE:
Typical V6 engine configuration shown in illustration.
Lubricate and install the lower bearing half (3) onto the main cap (1).
Install the main bearing cap (1) with two inner main bearing cap bolts (2) tightened to 20 N.m (15 ft. lbs.) plus 90°.
Repeat the previous steps for main bearings 3, 1 and 4.
Measure crankshaft end play. Refer to STANDARD PROCEDURE .

Fig 12: Windage Tray With Main Bearing Cap Bolts Installation Sequence
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Install the windage tray with eight main bearing cap bolts. Tighten the bolts in the sequence shown in illustration to 21 N.m (16 ft. lbs.) plus 90°.

Fig 13: Main Bearing Tie Bolts Installation Sequence
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NOTE:
Typical V6 engine configuration shown in illustration.
Install the eight main bearing tie bolts. Tighten the bolts in the sequence shown in illustration to 28 N.m (21 ft. lbs.).
Install the engine oil pump, oil pump pick-up and oil pan. Refer to PUMP, ENGINE OIL, INSTALLATION .

Fig 14: Left Engine Mount Isolator & Fasteners
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Install the left engine mount isolator (1). Refer to INSULATOR, ENGINE MOUNT, LEFT, INSTALLATION .

Fig 15: Right Engine Mount Isolator & Fasteners
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Install the right engine mount isolator (1). Refer to INSULATOR, ENGINE MOUNT, RIGHT, INSTALLATION .
If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to STANDARD PROCEDURE .
Connect the negative battery cable and tighten nut to 5 N.m (45 in. lbs.).
Operate the engine until it reaches normal operating temperature.