GM 89060436
Rear Main Seal

The Crankshaft rear oil seal and housing replacement requires removing the transmission from the engine and then unbolting the Flywheel to separate it from the motor. First, remove the Crankshaft rear oil seal housing bolts but replace them with two bolts in the jackscrew holes to take off the cover from the block. Next is Crankshaft removal to access the rear oil seal housing so you can extract the oil seal from the Crankshaft snout. The rear seal installer (J 44227) assists in Crankshaft rear oil seal installation by guiding the process. After sealing it in position remove the installer tool. Use 3 mm (0.12 inch) gm p/n 12378521 adhesive to coat the rear oil seal housing. Insert cover alignment pins (J 44219) into the block while you utilize the plastic installation sleeve provided with the new seal. This sleeve should separate after the installation is complete. Set the Crankshaft rear oil seal housing over the alignment pins and Crankshaft before you install the housing bolts except for the guide pins. After removing the guide pins install the remaining housing bolts and apply 10 nm torque to all elements. The bottom of the Oil Pan sealing area needs its extra material removed before installing the Flywheel with bolts while following a 25 nm (18 ft. Lbs.) sequence for tightening. To finalize the transmission installation use the torque angle meter (J 36660-A) for tightness control on the bolts by adding 50 degrees to their turning angle.

The Crankshaft Front Oil Seal Installer (J 41478) serves as the necessary tool to replace crankshaft front oil seal (140) for all models outside of RPOs LC9, LMG, LY2, and LY5. Start the replacement procedure by disconnecting the crankshaft balancer. After removing the crankshaft front oil seal (140) from the front cover proceed with the next step. Oiling the oil seal sealing surface should be avoided as well as reusing the crankshaft front oil seal. Apply clean engine oil to both the outer portion of new oil seal (140) and bore of front cover oil seal surface. The crankshaft front oil seal (140) should be mounted onto the J 41478 guide before inserting the J 41478 threaded rod (along with nut, washer, and guide, and oil seal) into the crankshaft end. Follow these steps to install the oil seal into the cover bore using the J 41478 while applying one wrench to the hex on its installer bolt and the other wrench to turn its installer nut clockwise for complete seal insertion. Check that the front cover bore receives the complete and uniform installation of the oil seal after you take off J 41478. Finally, reinstall the crankshaft balancer.

To replace the crankshaft rear seal, you should first remove the engine's Flywheel then remove crankshaft rear oil seal from the back seal. Before installing the new oil seal, make sure the Flywheel spacer (if necessary) is removed, and do not lubricate in the inside diameter (ID) of the oil seal or the surface of the crankshaft, as the replacement of the crankshaft rear oil seal is prohibited. Start by lubricating the outside diameter (OD) of the new oil seal with fresh clean engine oil and avoid any rubbing of the lubricants with the od of the seal. Next, grease the rear cover oil seal bore with clean engine oil, without touching the crankshaft surface. Install the (J 41479) crankshaft rear oil seal installer and bolts the tapered cone onto the rear of the crankshaft, tightening the bolts just until they are tight but not over tightening. Smear the rear oil seal on the tapered cone and apply pressure towards the rear cover bore. Threading j 41479 threaded rod into the tapered cone until tool contacts the oil seal, insert oil seal into the tool. Set the handle of the toll before the seal engages the rear cover and rests on the cover bore. Last but not the least, replace the j-41479 and the engine Flywheel.

To remove the crankshaft rear oil seal, first, remove the automatic transmission flex plate. Finally, remove the old crankshaft rear oil seal (141). For installation, reverse-lip aspect of the oil seal should face in the away from the engine with the part number marks turned in that direction. Start by checking out the seal's correct orientation. Change the tractor back to normal sitting position, install the J 41479 Crankshaft Rear Oil Seal Installer (J 41479) cone and bolts onto the rear of the crank shaft, teasing the bolts tight without overtightening. Then, deposit the rear oil seal over the tapered cone and push it into the rear seal bore. The J 41479 threaded rod should be threaded into the tapered cone until it makes contact with the oil seal, positioning the oil seal into the tool. Turn the handle of the tool clockwise so that the seal becomes fully seated in the rear cover bore. Lastly, remove the J 41479 and install the automatic transmission flexplate.

In order to replace the crankshaft rear oil seal, do the following: remove the engine fly-wheel, and then remove the crankshaft rear oil seal from the rear cover. As part of installation, make sure that the Flywheel spacer (if it exists) is off, and do not lubricate the inside diameter (ID) of the oil seal or the surface of the crankshaft; the crankshaft rear oil seal should not be reinstalled. Apply a clean engine oil to lubricate the outside diameter (OD) of the oil seal, making sure there is no oil or any other dressings on the oil seal surface. Also apply some clean engine oil to the bore in the rear cover to prevent it from touching the surface of the crankshaft. Next, mount j 41479 tapered cone and bolts on the rear of the crankshaft and tighten until snug without overtightening them. Mount the rear oil seal onto the tapered cone and press it to the rear cover bore. Thread the j 41479 threaded rod through the tapered cone until the contact of the tool with the oil seal, then align the oil seal into tool. Twist the handle of the tool clockwise until the seal comes into the rear cover and bottoms thereinto the cover bore. Lastly, take out the j 41479 and install the engine Flywheel again.

Service of the front crankshaft seal requires removing the crankshaft balancer first. The first step should be to remove the front crankshaft oil seal from its position. The Engine Front-Cover Oil Seal Installer (J 41478) should be used to put in the new front crankshaft oil seal followed by crankshaft balancer reinstallation.

You should begin by removing the engine Flywheel and follow it up by removing the crankshaft rear oil seal from the rear cover. Check that you remove any Flywheel spacer before continuing while skipping oil lubrication on both the inside diameter of the oil seal and crankshaft surface because the original crankshaft rear oil seal needs replacement. Apply clean engine oil to the outside diameter (OD) of the oil seal but keep the seal surface free from oil and other lubricants. After liberally applying clean engine oil at the rear cover oil seal bore you must ensure that the crankshaft surface remains free of oil. Install j41479 tapered cone and bolts to the crankshaft rear where you should tighten each bolt equally until they are just tight enough. The tapered cone guides the rear oil seal as you push this component into the rear cover bore. It is necessary to thread the j41479 threaded rod through the tapered cone so the tool comes into contact with the oil seal prior to sealing it into position. Twist the tool's handle toward yourself while inserting the seal into the cover bore until the seal reaches its bottom position. You should remove the j41479 and reattach the engine Flywheel as the final step.

To replace the crankshaft rear oil seal, it is necessary first to take off the Flywheel. Next, take a flat-tipped screwdriver and use it to pry the seal away from the housing into the access notches, discarding the old seal after doing so. Clean any dirt or rust on the site and put 2 to 3 drops of clean engine oil on the bore of the housing, the outer diameter of engine pilot flange, on the outside diameter of the Flywheel pin, and the Crankshaft Seal side which also helps in protection on the seal surface. Make sure that the new seal is correctly positioned, and the word "this side out" is stamped on it. Analyze the j 35621-b (J 35621-B) flange for any imperfection that could cause destruction of the new seal, contact the new seal with a fine grade emery cloth to remove minor flaws. Do not let oil or any lubricants come into contact with the seal lip surface. Take off the sleeve from the seal and add 2-3 drops of clean engine oil to outer diameter of the seal. Mount the seal onto the j 35621-b (J 35621-B) and on the back of the crankshaft, by tightening the tool bolts by hand until tighten. The oil seal alignment of the crankshaft rear plays a vital role. It should be installed in nearby, flush, and square to the crankshaft rear oil seal housing. Turn the j 35621-b (J 35621-B) wing nut clockwise until the seal in installed just shy and square to the housing. Feel more resistance when the seal when gets to the bottom of the housing bore. Take the seal off the j 35621-b (J 35621-B) connection by unscrewing the wing nut with the help of a counterclockwise motion before taking the tool away and removing all the excess engine oil with the help of a clean rag and put it back together again with the engine Flywheel.

First to replace the crankshaft rear oil seal, pull the engine Flywheel, then pull off the crankshaft rear oil seal with the rear cover. Before installing the new oil seal, be sure to take off the fly wheel spacer (where applicable) and do not apply any lubricant to the oil seal inside diameter (ID) or the crank shaft surface as reinstalling the existing crank shaft rear oil seal is not allowed. Start lubricating the new oil seal's outside diameter (OD) with clean engine oil, while making sure that no oil or other lubricants touch the seal surface. Next, lubricate the rear cover oil seal bore with clean engine oil without having the crankshaft to touch it. Put the j 41479 tapered cone and bolts onto the rear of the crankshaft and then tighten up the bolts until they are tight but not all the way tight. Put the rear oil seal on the cone with a taper and direct it toward the tubular bore. Insert the j 41479 threaded rod into the tapered cone until the j 41479 threaded rod meets the tool and then align the oil seal into the tool. Turn the handle of the tool in the clock wise direction until the seal is inserted to the rear cover and bottoms into the cover bore. Lastely, pull off the j 41479 and replace the engine Flywheel.

To change crankshaft rear oil seal, remove the automatic transmission flexplate, and discard the crankshaft rear oil seal (141). For correct installation, pay attention to the orientation of the oil seal that has a reverse-lip form with the text of the part number on the external side. Check part number markings on the seal, making sure the seal is orientated correctly. Mount the J 41479 cone and bolts, securing them to the rear of the crankshaft while holding the bolts tight but not over tightening. Next, install the rear oil seal onto the tapered cone with the part number markings away from the engine so as to push the seal to the rear seal bore. Thread the threaded rod J 41479 through the tapered cone till it is at the oil seal, and then align your oil seal into the tool. Rotate the handle of the tool clockwise until the seal enters the rear cover, and bottoms into the cover bore. Lastly, take off the J 41479 and refit the automatic transmission flexplate.

The first step to replace the crankshaft front oil seal is to remove the crankshaft balancer. You need to extract the crankshaft front oil seal (140) from the front cover. The correct procedure requires non-oil lubrication on the oil seal sealing surface and complete avoidance of front crankshaft oil seal reuse during installation. Clean engine oil must be applied at the outer edge of the oil seal (140) and the front cover oil seal bore before starting the installation process. Place the crankshaft front oil seal (140) onto the dedicated J 41478 (Crankshaft Front Oil Seal Installer). The first step entails positioning the J 41478 threaded rod with its attached nut, washer, guide, and oil seal into the crankshaft end while using the J 41478 for correct installation of the oil seal into the cover bore. Use a second wrench to rotate the installer nut clockwise until the seal rests completely within the cover bore while holding the hex of the installer bolt with a wrench. Always check the oil seal installation in the front cover bore after removing the J 41478 by inspecting it for proper and uniform distribution of the seal inside the bore. Finally, reinstall the crankshaft balancer.

First, remove the Flywheel in order to replace the crankshaft rear oil seal. Use a flat-tipped screw driver to gently remove the seal from the housing at the access notches and discard the used seal. Clean out any dirt or rust around the area followed by the application of 2 to 3 drops of clean engine oil to the bore of the housing or the outer diameter of the engine Flywheel pilot flange, and the outer diameter of Flywheel location pin or the Crankshaft Seal surface. Make sure the new reverse style seal is in the right position and reads "this side out" on it. Check the j 35621-b (J 35621-B) flange for imperfections that could damage the total new seal by minimizing small imperfections with fine grade emery cloth. Prevent the seal lip surface from coming in contact with oil or lubricants. Take the sleeve out of the seal, and apply 2 to 3 drops of clean engine oil to the outside diameter. Mount the seal to the j 35621-b (J 35621-B) and back onto the crankshaft, hand torquing the tool bolts into position. Proper alignment of the crankshaft rear oil seal is very important; mount it near flush and square to the back of crankshaft rear oil seal housing so as not to fail. Turn the j 35621-b (J 35621-B) wing nut clockwise until the seal is positioned as close to flush and square within the housing as possible, feeling that the seal reached the bottom of the housing bore. Afterward, rotate the wing nut counter clockwise to extricate the j 35621-b (J 35621-B) from the seal, take the tool, wipe it with a clean cloth, if necessary, of extra engine oil, and thereafter, instill the engine Flywheel.

To replace Crankshaft rear oil seal and housing, first remove the transmission, and remove flying wheel bolts then Flywheel will be removed. Next, take away the crank shaft rear oil seal housing bolts and insert two bolts in jackscrew hole to remove the cover from block. Next is to take out the crank shaft and rear oil seal housing and the extraction of oil seal from the crank shaft snout. And for installation, using the rear seal installer (J 44227), install the Crankshaft rear oil seal and then take it out. Put on a 3 mm (0.12 inch) bead of gm p/n 12378521 on the rear oil seal housing, and install the cover alignment pins (J 44219) into the block. Pull the Crankshaft rear oil seal housing over the alignment pins and Crankshaft. Use of the plastic installation sleeve provided in the new seal is important, and after its installation should be discarded. Fit the Crankshaft rear oil seal housing bolts to the two omitted guide pins and remove the guide pins so that the remaining bolts are fitted and the bolts tightened to 10 nm (89 inch lbs.). Remove any leftover material from the bottom of the Oil Pan sealing area, and then install the Flywheel as well as bolt on, tighten up 25 nm (18 ft. Lbs. In a designed sequence). Finally, tighten the bolts with the help of the torque angle meter (J 36660-A) by 50 degrees and prevent the transmission from being installed.

The replacement of crankshaft rear oil seal requires removal of engine Flywheel followed by extraction of the oil seal from the rear cover. The removal of any Flywheel spacer (if present) must happen before oil seal installation while also avoiding oil application on the inside diameter of the oil seal and the crankshaft surface since the crankshaft rear oil seal remains unusable during the procedure. Apply clean engine oil to the outside diameter of the new seal before avoiding contact of any oil lubricant with the surface area. A clean engine oil application should coat the rear cover oil seal bore only after abiding by a specific area around the crankshaft surface. Attach the j 41479 tapered cone and bolts to the crankshaft rear end but stop before overtightening the bolts. Restrict the rear oil seal onto the tapered cone then push it forward towards the rear cover bore. Insert the j 41479 threaded rod into the tapered cone until it reaches the tool contact point on the oil seal before aligning the oil seal properly in the tool. After positioning the tool by rotating the handle in a clockwise direction the seal will fully enter the rear cover and stop in the designated bore of the cover. Remove j 41479 and install the engine Flywheel for completion of the procedure.

The first step for replacing the crankshaft front oil seal of RPOs LC9/LMG/LY2/LY5 (4.8L and 5.3L) requires the removal of the crankshaft balancer. Remove the crankshaft front oil seal from the front cover space. The proper replacement method excludes oil lubrication of the oil seal's sealing area while it mandates the use of a new crankshaft front oil seal. Start the setup process by applying clean oil to the outer part of the new seal and bore of the front cover. The Crankshaft Front Oil Seal Installer (J 41478) assists with proper installation of the oil seal to its guide. To install the oil seal into the cover bore of the crankshaft you must use the J 41478 threaded rod along with its components of nut, washer, guide, and oil seal at the end of the crankshaft. Keep a wrench on the installer bolt hex while using another wrench to twist the installer nut clockwise until the seal fully meets the cover bore. Check the installation quality of the J 41478 by inspecting the oil seal position inside the front cover bore after its removal. Finally, reinstall the crankshaft balancer.

In order to replace the Crankshaft rear oil seal on engines with displacements of 4.8l, 5.3l, and 6.0l, the following tools will be needed: Crankshaft rear oil seal installer (J41479). Take off the engine Flywheel and then the Crankshaft rear oil seal from the rear cover. Before the oil seal can be installed, it is critical to make sure the Flywheel spacer is removed if it applies and must not lubricate the oil seal inside diameter (ID) and the Crankshaft surface and avoid the reuse of the Crankshaft rear oil seal. Lubricate the outside diameter (OD) of the new oil seal using the clean engine oil, while ensuring the oil does not come into contact with the seal surface. Additionally, lubricate the back cover oil seal bore with the clean engine oil without permitting oil to come into contact with the Crankshaft surface. Next, install the j41479 tapered cone and bolts to the rear of the Crankshaft, tighten the bolts until tight, but do not over tighten them. Mount the rear oil seal on tapered cone and compress it on the rear cover bore. Thread the j41479 threaded rod in the tapered cone till the tool touches the oil seal and then position the oil seal to the tool. Turn the handle of the tool clockwise so that the seal inserts into the rear cover, bottoming it into the cover bore. And finally, remove the j41479 and install the engine fly wheel.

A crankshaft balancer needs to be uninstalled first before replacing the front oil seal. Begin the replacement by extracting the crankshaft front oil seal (140) from the front cover. The crankshaft front oil seal sealing surface requires no lubrication and the technician should avoid installing previously used crankshaft front oil seals. Clean engine oil needs application on both the new oil seal's (140) outer surface and the front cover bore. Put the J 41478 guide on the crankshaft front oil seal (140) then place the threaded rod (J 41478) with guide and washer and nut and the oil seal into the crankshaft end. Insert the oil seal into the cover bore using J 41478 while holding its hexagonal installer bolt with one wrench and turning the installer nut with another wrench until the seal reaches total installation depth in the bore. Check that the front cover bore displays an even installation of the oil seal before removing the J 41478 guide. Finally, reinstall the crankshaft balancer.

Install the generator and water pump drive belt, followed by the A/C compressor and power steering pump drive belt.

Use the Seal Installer (J 44218) to install the front oil seal.

Reattach the engine flywheel.

Install the housing bolts, leaving out the two in place of the guide pins.

Use the Rear Seal Installer (J 44227) to install the crankshaft rear oil seal, then remove the installer.

Reinstall the crankshaft balancer, followed by the generator and water pump drive belt, and finally the A/C compressor and power steering pump drive belt.

Reinstall the crankshaft balancer.

Rotate the handle of the tool clockwise until the seal is fully seated in the rear cover.

Take out the crankshaft rear oil seal and housing.

Use the Oil Seal Installer (J 29184).

Screw in a self-tapping screw and use pliers to pull the rear main oil seal out.

Tighten the bolts until snug without overtightening.

Remove the J 41478 and inspect the oil seal to ensure it is evenly and completely installed in the front cover bore.

Remove the crankshaft balancer.

Avoid contact with the crankshaft surface.

Remove the oil pan.

Use a flat-bladed tool to pry out the crankshaft rear oil seal by inserting it through the dust lip at an angle and moving the handle towards the end of the crankshaft, repeating as necessary.

Reinstall the engine flywheel and ensure all parts are secured properly during reassembly.

Remove the Seal Installer (J 35354).

Inspect the inside diameter of the bore and repair or replace the crankshaft rear oil seal housing if needed, and check the crankshaft for nicks or burrs on the surface that contacts the seal, repairing or replacing the crankshaft if necessary.

Push the rear oil seal into the rear cover bore.

Install 2 bolts into the threaded holes to act as jack screws and tighten them evenly.

Lubricate the outer edge of the new oil seal and the front cover oil seal bore with clean engine oil.

It is important not to lubricate the Inside Diameter (ID) of the crankshaft surface and to avoid reusing the crankshaft rear oil seal.

First, remove the crankshaft balancer.

Lubricate the outer edge of the new oil seal with clean engine oil and the front cover oil seal bore.

Take out the crankshaft rear oil seal.

Hold the hex on the installer tool with a wrench while using a second wrench to rotate the installer nut clockwise until the seal is fully seated in the cover bore.

First, remove the engine flywheel.

Gently pry the crankshaft rear oil seal from the rear cover.

Tilt the housing slightly to allow sealer between it and the oil pan, align it with the right alignment dowel, tilting the left side up slightly, then align it with the left dowel and press it against the engine block.

Use a new oil seal and note the installation direction, as the new design is a reverse lip type seal marked with THIS SIDE OUT.

It is essential to use a new oil seal and note the installation direction, as the new design is a reverse lip type seal marked with THIS SIDE OUT.

Push it into the rear cover bore.

Ensure that the flywheel spacer (if applicable) is removed, and do not lubricate the oil seal's inside diameter or the crankshaft surface.

Remove the crankshaft balancer and discard the old crankshaft oil seal.

First, remove the crankshaft balancer.

Lubricate the new oil seal with clean engine oil.

Install the new rear main seal.

Reinstall the crankshaft key into the keyway.

Remove the sleeve from the seal and apply 2 to 3 drops of clean engine oil to the outside diameter of the seal.

No, it is crucial not to lubricate the oil seal sealing surface.

Reinstall the crankshaft balancer.

Avoid contact with the seal surface.

Take out the crankshaft oil seal from the front cover.

Reinstall the crankshaft balancer.

Insert a flat-tipped screwdriver into the access notches and carefully pry the seal from the housing, then discard the seal and clean any dirt or rust in the area.

Finally, remove the J41479 and reinstall the engine flywheel.

Avoid contact with the seal surface.

Utilize the plastic installation sleeve supplied with the new seal.

The crankshaft front oil seal is installed using the J 41478 (Crankshaft Front Oil Seal Installer) guide.

Install the guide pins from the Crankshaft Rear Seal Puller (J 43320) into the crankshaft and position the puller over the guide pins.

Employ the Rear Seal Installer (J 44227) to install the crankshaft rear oil seal.

Use the Seal Installer (J 44218) to properly install the front oil seal.

Turn the J 35621-B wing nut clockwise until the seal is installed close to flush and square, feeling increased resistance when the seal reaches the bottom of the housing bore.

First, remove the flywheel.

Insert the J41478 threaded rod (with nut, washer, guide, and oil seal) into the end of the crankshaft, and use the J41478 to install the oil seal into the cover bore.

Remove the J 41478 and inspect the oil seal to ensure it is evenly and completely installed in the front cover bore.

First, remove the transmission.

Begin by lubricating the outer edge of the new oil seal and the front cover oil seal bore with clean engine oil.

The J41478 Crankshaft Front Oil Seal Installer (J41478) guide.

Remove the J 41479 and reinstall the engine flywheel.

Apply engine oil to the outside diameter of the new crankshaft front oil seal.

Finally, remove the J 41479 and reinstall the automatic transmission flex plate.

Remove the J 41478 and inspect the oil seal to ensure it is evenly and completely installed in the front cover bore.

No, it is important not to lubricate the oil seal sealing surface.

Remove the crankshaft balancer.

Position the plastic installation sleeve that comes with the new seal onto the crankshaft.

Ensure it is flush and square to the engine front cover.

Remove the crankshaft rear oil seal housing bolts and install two bolts into the jackscrew holes to release the cover from the block.

The oil seal's reverse-lip design should be oriented correctly, with the part number markings facing away from the engine.

Coat the new crankshaft front cover oil seal with clean engine oil.

After installation, remove the Rear Seal Installer (J 44227) and discard the seal installation sleeve.

Take out the crankshaft front oil seal (140) from the front cover.

Inspect the engine front cover seal bore area for any damage.

Take out the crankshaft front oil seal from the front cover.

Rotate the handle of the tool clockwise until the seal is fully seated in the rear cover bore.