Crankshaft Rear Oil Seal – Oil Leak – 2012-2013 Buick Cadillac Chevrolet GMC

#14-06-01-002A: Crankshaft Rear Oil SealOil Leak – (Dec 1, 2014)

Subject: Crankshaft Rear Oil SealOil Leak
Models: 2012-2013 Buick Enclave, LaCrosse
2012-2013 Cadillac CTS, SRX
2013 Cadillac ATS, XTS
2012-2013 Chevrolet Camaro, Captiva, Equinox, Impala, Traverse
2012-2013 GMC Acadia, Terrain
Equipped with 6 CYL, 3.0L — RPO LFW
Equipped with 6 CYL, 3.6L — RPO LFX or LLT

This Bulletin has been revised to add certain Model Year 2012 vehicles, change the Special Tool in Step 6 to GE-6125-1B, change the Special Tool in Step 18 to EN-45059-A and to remove the Build Breakpoint date. Please discard Corporate Bulletin Number 14-06-01-002.


 

Condition

Some customers may comment on an engine oil leak under their vehicle.

Upon inspection, the Service Technician may observe an engine oil leak between the engine and transmission mounting surfaces.

 

Cause

This may be caused by the crankshaft #3 thrust bearing wing separating from the thrust bearing, resulting in excessive crankshaft end play and damaging the crankshaft rear oil seal and housing.

 

Correction

The Service Technician can check for excessive crankshaft end play by removing the accessory drive belt and checking for excessive crankshaft movement.

Use a pry tool on the crankshaft pulley/dampener, being careful not to damage the crankshaft front cover seal.

If excessive crankshaft end play is observed, the engine oil pan will have to be removed for further diagnosis of the crankshaft #3 thrust bearing. Go to Step 1.

Crankshaft Rear Oil Seal

Crankshaft Rear Oil Seal

 

Another check that can be performed if the transmission has been removed for crankshaft rear oil seal and housing replacement, is to inspect the crankshaft rear oil seal and housing for friction rub marks.

If the crankshaft rear oil seal and housing display friction rub marks, the engine oil pan will have to be removed for further diagnosis of the crankshaft #3 thrust bearing. Go to Step 1.

Notice: The Crankshaft Rear Oil Seal Housing Replacement, Engine Oil Pan Replacement, Engine Front Cover Replacement and Transmission Replacement procedures vary from vehicle to vehicle. It is critical that the Service Technician refers to the appropriate document and its related documents for that specific vehicle.

  1. Perform the actions for the vehicle in order to remove the crankshaft rear oil seal and housing. Refer to Crankshaft Rear Oil Seal and Housing Replacement.
  2. Perform the actions for the vehicle in order to remove the oil pan. Refer to Oil Pan Replacement.
  3. Remove the bolts and the oil pan scraper from the oil pan and the oil pump suction pipe. Refer to Oil Pan Disassemble.
  4. Remove any gasket material or sealant from all oil pan and engine block gasket surfaces as needed, using the EN 28410 Gasket Remover. Clean the oil pan, oil pan scraper and oil pump suction pipe. Refer to Oil Pan Cleaning and Inspection.

thrust bearing

thrust bearing

  1. Typical view of a good crankshaft #3 thrust bearing with both thrust wings in place and a view of the crankshaft #3 thrust bearing (1) with one wing (2) broken off. The thrust bearing wing (2) is usually found in the engine oil pan, sometimes under the oil pan scraper. Ensure the failed thrust bearing wing is removed from the engine oil pan.

main bearing cap

 

  1. The crankshaft does not have to be removed to replace the #3 thrust bearing. Remove the inboard, outboard and short/inner side bolts of the main bearing cap. Remove the crankshaft #3 main bearing cap (3) using the GE-6125-1B (1) and the EN 49102 Crankshaft Bearing Cap Remover (2).
  2. Discard the lower thrust bearing half.

lower thrust bearing half

Notice: The crankshaft is removed in this graphic in order to provide a clear view for this Step.

  1. Use a 0.40 in feeler gauge or an equivalent tool to push down on the thrust bearing on the opposite side (2) of the bearing notch tab (1) that is seated in the engine block bulk head notch relief. This action will push the thrust bearing out far enough to grab and remove it. If the bearing does not rotate far enough to grab it, turn the crankshaft until the bearing moves completely out of the block.
  2. Discard the upper thrust bearing half.
  3. Clean all oil from the backside of the new thrust bearing halves. Apply crankshaft prelube or clean engine oil to the upper and lower bearing surfaces. Refer to Adhesives, Fluids, Lubricants and Sealers for recommended lubricant.

Notice: Ensure that the upper bearing insert contains the oil transfer hole and groove.

  1. Install the upper half of the thrust bearing by rotating it back into position, turning the crankshaft if necessary. The bearing notch tab MUST engage in the engine block bulk head notch relief. The bearing must fit flush with the upper crankcase.
  2. Install the lower half of the bearing into position in the main bearing cap. The bearing must fit flush with the bearing cap.

main bearing cap

 

  1. Install the main bearing cap with the arrow pointing towards the front of the engine.

Caution: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

  1. Loosely install the 2 NEW inner main cap bolts.
  2. Loosely install the 2 NEW outer main cap bolts.
  3. Tap the main bearing cap with a soft-faced hammer.
  4. Loosely install the 2 NEW short/inner side main cap bolts
  5. Tighten the main bearing cap bolts using the EN 45059-A Angle Meter in the following sequence:

following sequence

  1. Tighten the inboard main cap bolts (3 and 4) first, in two passes.

19.1. Tighten the inboard bolts to 20Y (15 lb ft) on the first pass.

19.2. Tighten the inboard bolts an additional 80 degrees on the second pass.

second pass

 

  1. Tighten the outboard main cap bolts (11 and 12) second, in two passes.

20.1. Tighten the outboard bolts to 15Y (11 lb ft) on the first pass.

20.2. Tighten the outboard bolts an additional 110 degrees on the second pass.

19 and 20

  1. Tighten the short/inner bolts (19 and 20) third, in two passes.

21.1. Tighten the short/inner bolts to 30 Y (22 lb ft) on the first pass.

21.2. Tighten the short/inner bolts an additional 60 degrees on the second pass.

  1. Ensure that the crankshaft turns without binding or noise.

guides

  1. Install the 6 mm (0.236 in) guides from the EN-46109 Guide Pin Set into the 2 crankshaft rear oil seal housing corner bolt holes of the engine block.

 

Crankshaft Rear Oil Seal Installation Tool

  1. Install the EN-47839 Crankshaft Rear Oil Seal Installation Tool and the EN-42183 Handle (1, 2) onto the rear of the crankshaft flange.

bead of RTV sealant

  1. Apply a 3 mm (0.118 in) bead of RTV sealant (1) to the NEW crankshaft rear oil seal housing.

Notice: DO NOT allow any engine oil on the area where the crankshaft rear oil seal housing is to be installed.

  1. Install the crankshaft rear oil seal housing to the engine block.
  2. Remove the EN-46109 Guides from the engine block.
  3. Install the crankshaft rear oil seal housing bolts.

Tighten the crankshaft rear oil seal housing bolts

 

  1. Tighten the crankshaft rear oil seal housing bolts in the sequence shown to 10Y (89 lb in).
  2. Remove the EN-47839 and EN-42183 from the crankshaft flange.

oil pump suction pipe seal

Notice: DO NOT reuse the old oil pump suction pipe seal.

  1. Install a NEW oil pump suction pipe seal (1) on the oil pump suction pipe.
  2. Install the oil pump suction pipe and tighten the bolts to 10 Y (89 lb in).
  3. Install the oil pan scraper and tighten the bolts to 10 Y (89 lb in).

RTV sealant

  1. Apply the proper size bead (1) of RTV sealant on the block pan rail, the crankshaft rear oil seal housing and the engine front cover as specified for that vehicle. Refer to Oil Pan Replacement.
  2. Install the oil pan and tighten the oil pan bolts in the specified sequence to the proper torque. Refer to Oil Pan Replacement.
  3. Assemble and install any remaining parts and fluids as needed to complete the repair.

 

Parts Information

Part Number Description Quantity
12643668 Bearing Kit – Crankshaft Thrust 1
12637710 Seal, Crankshaft Rear Oil 1
12566837 Seal, Oil Pump Suction Pipe 1
11609410 Bolt – Crankshaft Bearing Cap 2
12560272 Bolt – Crankshaft Bearing Cap 2
11518861 Bolt – Crankshaft Bearing Cap 2

 

 

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