How to Replace Rear Main Seal on Buick LaCrosse?

Rear Main Seal replacing details are as follows:---
Its for both 3.6L engine and 3.8L Engine.Refer both Procedures.


Rear Main Seal
REMOVAL & INSTALLATION Procedure is mentioned below:----

3.6L Engine

1. Before servicing the vehicle, refer to the Precautions Section.
2. Remove the transaxle.
3. Remove the engine flywheel bolts and discard.
4. Remove the engine flywheel from the crankshaft.
5. Remove the oil pan.
6. Remove the crankshaft rear oil seal housing bolts.
7. Using the pry points located at the edge of the crankshaft rear oil seal housing shear the RTV sealant.
8. Remove and discard the crankshaft rear oil seal housing.

To install:

 

Fig. Install the 6mm (0.236 in.) guides from kit EN 46109 into the 2 crankshaft rear oil seal housing corner bolt holes of the engine block-3.6L engine

1. Install the 6mm (0.236 in.) guides from kit EN 46109 into the 2 crankshaft rear oil seal housing corner bolt holes of the engine block. 
   
   
   
   Fig. Install seal tools EN-47839 with the J-42183 (1, 2) onto the rear of the crankshaft flange-3.6L engine
2. Install seal tools EN-47839 with the J-42183 (1, 2) onto the rear of the crankshaft flange. 
   
   
   
   Fig. Place a 3mm (0.118 in.) bead of RTV sealant, GM P/N 12378521 (Canadian P/N 88901148) or equivalent, to the NEW crankshaft rear oil seal housing as shown (1) -3.6L engine
3. Place a 3mm (0.118 in.) bead of RTV sealant, GM P/N 12378521 (Canadian P/N 88901148) or equivalent, to the NEW crankshaft rear oil seal housing as shown (1).
   
   NOTE

   DO NOT allow any engine oil on the area where the crankshaft rear oil seal housing is to be installed.
4. Install the crankshaft rear oil seal housing to the engine block.
5. Remove the guides from the engine block.
6. Install the crankshaft rear oil seal housing bolts. Tighten the crankshaft rear oil seal housing bolts to 89 inch lbs. (10 Nm).
7. Remove the seal tool from the crankshaft flange.
8. Install the oil pan.
9. Place the engine flywheel in position on the crankshaft.
10. Install 2 NEW bolts in location at the top and bottom of the engine flywheel bolt pattern allowing the engine flywheel to hang in position.
11. Install the remaining NEW engine flywheel bolts.
    
    
    Tighten the NEW engine flywheel bolts to 22 ft. lbs. (30 Nm)

    Tighten the NEW engine flywheel bolts an additional 45°
12. Install the transaxle.

3.8L Engine

1. Before servicing the vehicle, refer to the Precautions Section.
2. Remove or disconnect the following:
   
   WARNING

   Do not damage or scratch the sealing surface of the crankshaft or the seal bore.
   
   
   
   
   Transaxle assembly

   Flexplate from the crankshaft

   Rear main seal from engine block by inserting a small flat-bladed prytool through the dust lip at an angle, then pry out the crankshaft rear oil seal. Repeat as necessary around the seal until it is removed.

To install:

1. Lubricate new rear main with clean engine oil prior to installation.
2. Slide the oil seal on the mandrel of seal installer tool J-38196 until the back of the seal is seated squarely against the collar of the tool.
3. Attach the seal installer to the rear of the crankshaft with the 2 mounting bolts, then turn the T-handle until the oil seal is fully seated into the rear of the engine.
4. Loosen the T-handle of the tool completely.
5. Remove both bolts and the tool.
6. Install or connect the following: 
   
   
   Flexplate. Torque the bolts to 11 ft. lbs. (15 Nm), plus an additional 50°.

   Transaxle 
   
    
   

   Fig. Rear main oil seal and rear cover-3.8L engine

These details will help.

Thanks.

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html