New Rear Main Seal Installation for 1995-2004 GM 3.8L Engines - Engine Builder Magazine
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New Rear Main Seal Installation for 1995-2004 GM 3.8L Engines

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Affects 1995-2004 GM models with with 3.8L V6 Engines (VINs K, 1,2, 4 – RPOs L36, L67, L26, L32)

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Crankshaft Rear Oil Seal and Housing Removal

1) Remove oil pan assembly as outlined in the appropriate Service Information Manual.

2) Remove the crankshaft rear oil seal housing bolts.

3) Remove the crankshaft rear oil seal housing and gasket (Figure 1).

4) Place the crankshaft rear oil seal housing face down on a clean surface and support with blocks of wood.

5) Use a suitable driving tool and hammer and lightly tap around the outer edge of the seal to remove it (Figure 2).

6) Clean and Inspect the crankshaft rear oil seal housing making sure it is free of any foreign material.

7) With all bolts removed from the housing, place it face up on a flat clean surface.

Crankshaft Rear Oil Seal and Housing Installation

Tools:

EN 47623 Rear Main Seal installer

J 8092 Drive Handle

J 45059 Angle Meter

Do
not apply or use any oil lubrication on the rear main oil seal, rear
main oil seal housing or rear main seal installer EN 47623. Do not
touch the sealing lip of the rear main oil seal once the protection
sleeve is removed. Doing so will damage/deform the seal.

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Clean
crankshaft sealing surface with a clean, lint-free towel. Inspect
lead-in edge of crankshaft for burrs/sharp edges that could damage the
rear main oil seal. Remove burrs/sharp edges with crocus cloth before
proceeding.

1) Carefully remove protection sleeve from new rear  oil seal assembly.

Notice
the direction of the rear oil seal. The new design seal is a reverse
style as opposed to what has been used in the past. THIS SIDE OUT has
been stamped into the seal as shown in the graphic (Figure 3)

2.)install the seal onto EN 47623 by placing the seal on an angle and using a twisting motion until it is fully seated.

3)
Place EN 47623 along with J8092 onto the housing as shown and apply a
constant downward force until the seal is fully seated (Figure 4).

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Do
not use a sealant or adhesive when installing this component. Use of a
sealant or adhesive can cause improper sealing. A component that is not
sealed properly can leak, leading to extensive engine damage.

4)
Install the crankshaft rear oil seal housing gasket and housing onto
the engine. Make sure to use a new oil seal housing gasket.

The
plastic inserts in the crankshaft rear oil seal housing bolt holes are
used to aid assembly only. The inserts are not required for service
(Figure 5).

5) Install the crankshaft rear oil seal housing bolts and finger tighten.

6)
Place a straight edge on the engine block oil pan flange and the
crankshaft rear oil seal housing flange. Use a feeler gage to ensure
there is no more than 0.004? (0.10 mm) step on each side. If necessary,
gently rotate the crankshaft rear oil seal housing to make the step
equal on each side (Figure 6).

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7)
Tighten the crankshaft rear oil seal housing bolts. Tighten the
crankshaft rear oil seal housing bolts to 11 ft.lbs. (15 Nm). Use J
45059 to tighten the bolts an additional 50 degrees.

8)
Recheck the step height on each side to ensure the crankshaft rear oil
seal housing did not move. If the step height is beyond specification,
re-install the crankshaft rear oil seal housing and measure the step
again. Replace the crankshaft rear oil seal housing if the clearance Is
still beyond specification.

9) Continue with oil pan installation as outlined in the Service Information Manual.

Some or all of the technical information was provided by the
Automotive Parts Remanufacturers Association (APRA). For more
information on technical bulletins available through APRA call
703-968-2772 or visit www.AutoBulletins.com.
figure 1figure 2figure 3figure 4figure 5Figure 6

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