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Old 03-03-2012, 10:33 AM   #1
kp_fisher
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2000 SL1
Default Main Bearing Seal

Anyone have any advise on changing a Main Bearing Seal in a 2000 SL1? I'm losing about a quart and a half every 3000 miles. Yesterday I discovered that the engine is coated in oil & sludge all around the seal.

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Old 03-03-2012, 11:38 AM   #2
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1998 SC2
Default Re: Main Bearing Seal

Which one? the one on the right hand end of the engine?

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Old 03-03-2012, 04:41 PM   #3
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Default Re: Main Bearing Seal

The one behind the crank pulley. Right side facing the front of the car.

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Old 03-03-2012, 05:05 PM   #4
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1995 SL2
Default Re: Main Bearing Seal

Have you checked your cam cover. It's possible the cam cover is leaking and oil is just collecting by the crank (the cam cover is a much more common source of leaks).

If you can confirm that it is the front main seal, it's relatively easy to replace. Remove the bolt and the harmonic balancer ("pulley"). Pull the seal out with something. Insert the new seal with just a bit of thread locker or anaerobic gasket maker spread on the outside (just a bit--you don't want too much!). Use a large socket or other appropriate tool to gently insert the new seal (you will need to use a hammer, but be gentle).

Be sure to check that the sealing surface on the pulley is in good shape (no nicks or scratches, and no groove where the seal wore into it). If it is not in good shape, you may need to replace it, or put a sleeve on it (replacing is often the best bet as they're pretty easy to find at junkyards, if you have (or can borrow) a good battery powered impact wrench to remove them).

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Old 03-03-2012, 05:49 PM   #5
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1998 SC2
Default Re: Main Bearing Seal

To start get a couple cans of brake cleaner and clean off the front of the engine to confirm the source of the leak.

Replacing that seal is not impossible but it is far from a 15 minute job either.

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