Date registered: Jul 2009
Vehicle: Current - 2007 S550, 2002 S430, 1997 E420; 1998 ML320. Deceased - 1974 240D, 1992 400E
Location: An island off the coast of Florida **Use startekinfo.com for official Mercedes technical guidance**
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Front Bumper replacement DIY
I replaced a front bumper on a 1997 E420 two months ago. Its straightforward, but you will need patience. Here are the steps used in this 4 hour job (if memory serves):
Jack + jackstands
wood chocks for rear tires
8mm socket and ratchet
10mm socket and ratchet
13mm box wrench
Canvas or blanket
1) Disconnect battery.
2) Safety jack car, and place on jackstands.
3) Remove under engine cowling. 8mm
4) Remove under bumper cowling.
5) Remove side marker yellow lights (plastic finger clip is on inside, push the light outward)
6) Remove sidemarker bulb when light assembly is free of bumper
There are 4 bolts/nuts holding the front bumper in place. 13mm Two nuts are below the auxilary fan, and two bolts are at the ends of the bumper next to the sidemarkers.
7) Remove the bolts next to the sidemarkers.
8) Lift up the plastic screen in front of the aux fan (it pulls straigt up).The front bumper nuts are located at the lower left and right sides, barely visible below the aux fans. The only way I could access was by using a 5/8 inch box end wrench with a built in ratchet. (Huskey, Gearwrench and Craftsman all carry these type wrenches.) Remove nuts. The bumper will stay on because the bolts are threaded into the bumper.
9) Position 4x4 blocks directly below bumper.
10) With helper, pull bumper forward, and lay it down on blocks. Avoid having the bumper is now hang by foglight wiring.
13) Pull out the styrofoam padding behind the bumper to access foglight mounting hardware.
12) Remove foglight A-frames, each held in place with 10mm bolt and plastic snaps. (I broke the snaps, and just replaced with threadlocked machine screws during reassembly).
12) Remove whatever pieces from the bumper you plan on keeping to keep from scratching while you reassemble.
13) Lay the new bumper on blanket and put new pieces in place. (Bumper, valence, trim). The hardest part of this job is taking off the chrome and reinstalling. The spring clips need to be hammered out, and hammered back in. Best way to reinstall is to firmly compress clips with pliers beforehand.
14) Reassemble in the reverse steps. I don't have torque values, but in this non-critical application, just torque securely EXCEPT for the side bumper bolts.
15) You may need to line up the side bumper trim with the fender wheelwell. A helper makes this easier to pull/push the bumper while you secure the side bolts.
Let us know how it goes for you.