All seals are installed with jaws inward (to the engine).
M10 and M30 engines (with distribution chain)
Front camshaft oil seal (only for M30 engines)
1. Remove only the top cover of the timing chain (see Section Removal and installation of covers of a distributive chain).
2. Support the cover with two pieces of wood and knock out the oil seal from the back with a hammer and screwdriver. Be careful not to damage the gland hole during operation.
3. Coat the OD and jaws of the new oil seal with multipurpose grease and install the oil seal into the cover using a hammer and a socket slightly smaller than the OD of the oil seal.
4. Perform the rest of the installation in the reverse order of removal.
Front crankshaft oil seal (M10 and M30 engines)
1. Remove crankshaft pulley and vibration damper (see Section Removal and installation of covers of a distributive chain).
2. Carefully remove the old oil seal from the cover using a large screwdriver. Be extremely careful not to damage the oil seal hole or crankshaft with the screwdriver. Wrap the tip of the screwdriver with duct tape to prevent possible damage.
3. Clean the oil seal hole in the cover, coat the outer edge of the new oil seal with engine oil or multipurpose grease. Also lubricate the seal lips with multipurpose grease. Using a replacement head with a diameter slightly smaller than the outer diameter of the oil seal, carefully tap the new oil seal into place using a hammer.
4. If a suitable replacement head is not available, a short piece of large diameter pipe will do.
5. Check the stuffing box after installation to make sure the spring around the inside of the stuffing box lips has not popped out.
6. Perform the rest of the installation in the reverse order of removal.
M20 and M40 engines (with timing belt)
Front camshaft oil seal (M20 and M40 engines)
1. Remove timing belt and camshaft sprocket (see Section Removal, inspection and installation of the distribution belt and sprockets of its tensioner).
2. Only on the M20 engine, release the two screws and remove the camshaft oil seal housing from the cylinder head by pulling and simultaneously turning it back and forth.
3. Only on M20 engines, support the casing with two wooden blocks and use a hammer and screwdriver to remove the oil seal from it. Be very careful not to damage the gland housing.
4. On M40 engines, remove the oil seal from the cylinder head with a screwdriver, being careful not to damage the camshaft surface or the oil seal hole.
5. Coat the lips and outside diameter of the new oil seal with multipurpose grease.
6. On M40 engines, wrap tape around the end of the camshaft to protect the new oil seal from damage by the groove during installation.
7. Carefully place the new oil seal in place and first push it in by hand until it fits into the hole. Install the oil seal in the casing or cylinder head (what is provided) using a hammer and an interchangeable head with a diameter slightly smaller than the outer diameter of the stuffing box. On M40 engines, remove the adhesive tape from the end of the camshaft.
8. On M20 engines, replace the O-ring at the rear of the stuffing box and fit the stuffing box lips onto the end of the camshaft. Install the screws and tighten them to the required torque.
9. Perform the rest of the installation in the reverse order of removal.
Front crankshaft and intermediate shaft seals (M20 engines)
1. Remove the timing belt and crankshaft and countershaft pulleys, if provided (see Section Removal, inspection and installation of the distribution belt and sprockets of its tensioner).
We recommend replacing the timing belt each time it is removed.
2. Give bolts and nuts of fastening of a forward cover to the block of cylinders. Don't forget to remove the three bolts from the bottom holding the front of the oil pan to the bottom of the front cover.
3. Pass a thin, sharp knife between the oil pan gasket and the front cover, thus separating the gasket from the cover. Be very careful not to damage or stain the gasket so that you can use it again later.
4. Destroy the gasket sealant between the front cover and the cylinder block by tapping the cover with a rubber-faced hammer or a regular hammer with a block of wood. Do not poke anything between the cover and the block to avoid damaging the gasket surfaces.
5. Using a scraper, remove all traces of the old gasket material from the mating surfaces of the covers and cylinder block.
Be extremely careful not to damage or scratch the soft aluminum surfaces. Also, be careful not to damage or stain the oil pan gasket. There are commercially available, and may be useful, special solvents for removing gaskets. Once the gasket material has been completely removed, the gasket surfaces can be degreased by wiping them with a cloth soaked in a suitable solvent.
6. Support the cover with two pieces of wood and knock out the oil seal from the back with a hammer and screwdriver. Be careful not to damage the gland hole during operation.
7. Coat the outside diameter and jaws of the new oil seal with multipurpose grease and install the oil seal into the bonnet using a hammer and a socket slightly smaller than the outside diameter of the oil seal.
8. Apply a light coat of RTV type sealant to the oil pan gasket surface mating with the front cover. Apply more sealant to the edges where the gasket meets the cylinder block.
If the oil pan gasket is damaged, then instead of completely replacing the gasket, you can try cutting off the front of the gasket where it meets the cylinder block, then cutting off the front of the new gasket so that it is exactly the same size. Cover the inside of the sump with a piece of rag, then scrape off any traces of old gasket material from the mating surfaces. Attach a piece of new gasket to the pan with special adhesive, then apply RTV sealant as described at the beginning of this paragraph.
9. Lubricate both sides of the new gasket with RTV sealant, attach the front cover to the front of the engine, carefully pushing the oil seals onto the crankshaft and countershaft. Fit the bolts and tighten them to the required torque. Tighten the bolts one by one in a crosswise pattern to do so evenly.
First tighten the bolts securing the front cover to the cylinder block, then the bolts securing the oil pan to the cover. If the gasket is protruding over the lid-to-block connection or is wrinkling at the lid-to-sump connection, cut it to fit properly.
Once the RTV sealant has been applied, assembly must be completed within 10 minutes to allow the sealant to cure.
10. Perform the rest of the installation in the reverse order of removal.
Front crankshaft oil seal (M40 engines)
1. Remove timing belt and crankshaft sprocket (see Section Removal, inspection and installation of the distribution belt and sprockets of its tensioner).
2. Remove the key from the groove on the end of the crankshaft.
3. Note the position of the oil seal, then remove it from the front cover with a screwdriver, being careful not to damage the oil seal hole or crankshaft surface. If the stuffing box is stuck, drill two small holes in the metal part of the stuffing box and use two self-tapping screws to remove the stuffing box. Be sure to remove all metal shavings.
4. Coat the outside diameter and jaws of the new oil seal with multipurpose grease and install the oil seal into the cover using a hammer and a socket with a diameter slightly smaller than the outside diameter of the oil seal. Make sure the seal is seated straight.
5. Perform the rest of the installation in the reverse order of removal. Do not forget that it is recommended to replace the distribution belt - see Section Removal, inspection and installation of the distribution belt and sprockets of its tensioner.