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Old 07-04-2012, 04:58 PM   #2
beberle
Registered User
 
Join Date: Mar 2004
Location: Atlanta
Posts: 181
My Ride: 2009 328 wagon
*Step 3- remove the driver's side engine mount. 16mm nut on bottom of control arm and 16mm nut on top of mount seen from above. Remove 4 13mm bolts and whole mount comes off of side of engine block. Also a thick grounding wire via 13mm nut to car frame.

*Step4- Guess this should almost be step 1!! I had a garage remove the rusted exhaust pipe to manifold nuts for me last year and change a frozen o2 sensor for me, so I didn't have to struggle. Removing the 4 exhuaust nuts will be the hardest part for most DIYers.

*Step 5- remove the top o2 sensors for easy removal of manifolds/cats.

*Step 6- you can now easily see most of the manifold nuts from the bottom of the car. The only ones not accessable from the bottom are the top nuts on the forward manifold. A 1/4" rachets w/ 11/2" extension and 11mm deep well socket was the perfect fit to get these off. I originally tried a 3/8" rachet and 3" extension and struggled for too long. I used the racheting 11mm box end wrench for the very back nut on the rear manifold. You must remove the front manifold 1st to gain easier access to the rear manifold.

pic 1- what it looks like underneath... easy access! pic2- some studs come out w/ nut. I replaced these. pic3- racheting box end on rear nut pic4- wrestling w/ top nuts pic-5- closeup shot of socket on top nut. NOTE the downward angle of the engine block and manifold studs. pic6- front manifold removed
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Last edited by beberle; 07-04-2012 at 05:11 PM.
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