I'm trying to go underneath the wiper assembly to get to the blower motor. When I looked at the MB manaul it gives 2 ways. My assembly is unlike either one. There is a screw on top that when i remove it ( as per step 1 in both opions), there is nowhere else to go. It doesnt seem to loosen anything. Both versions shown in the manual indicate that the wiper arm should come off after this. It's not happening! It feels like the entire piece is held on from the bottom and I can't figure out how the screws would be accessible. I searched the forum and there was a pictorial description of someone doing it but it is no longer available. Although I'm not srue that it was on the same assembly that I have. Any help would be appreciated. darkman

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k. darkman
1987 300D Turbo 200k

I have a different car, and four years later, but FWIW my monowiper has nuts up under the "lip" below the windshield. If I lean in and look up under there, I see them. There is a bolt in a little white bracket below the mechanism, and the one I think you are describing on the place that turns around to move the wiper back and forth. I just had mine off yesterday. The big thing I learned was to be careful of those nuts as they come off, they're easy to lose. A flexible, magnetic pickup tool saved me about several times.

MDB

I just re-greased my mono wiper system in my 87 300D, and for me, I just followed my instinct. You need to remove the lower windshield moldings, they are clipped in so you just pull them out. From there just unscrew the remaining moldings including the molded plastic bins as well as the four screws that secure the rubber boot under the wiper.

Once you get this stuff out of the way, it will become clearer how everything is put together. It took me 1 and 3/4 hours to remove grease and put it all back together.

I know that you only need to access the blower, but this is a great opportunity to grease the wiper unit as they do wear out a plastic gear rack if not greased in 15 years and I read that they are $1400 new!

For me, the job was much easier than thought, so give it a shot!

thanks. I'm going to try this now. I'll post the results.

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k. darkman
1987 300D Turbo 200k

This might help-

It is from a "How to repair a mono-wiper"

Tools needed for repairing the wiper arm

-Small mirror
-Dental pick or small Allen wrench

Instructions:

-Raise the hood for improved access.

-With the ignition off, rotate the wiper switch to the first position.
-Turn the ignition on and off rapidly, so as to move the wiper arm out of the park position.

-Move the arm manually to the straight up position.

-Remove the three-sided rectangular cover (lower end of arm) that extends over the cap by pulling it straight up from the bottom end.

-Using a sensitive fingertip or a dental mirror, locate the two small recessed rectangular openings on the underside of the cap at roughly the 5 and 7 o'clock positions.

-Using a tool with a 90 deg end such as a dental pick or a small Allen wrench, release the catches in the access holes while pulling the cap upward with the left hand.

-Now that the entire articulated wiper actuator is in plain view, you will see as I did that the shaft that extends the arm up into the windshield corners (twice per sweep) is very likely no longer lubricated.

-Remove all the old grease from the shaft and bushing using for example a cloth soaked with lacquer thinner or similar, moving the arm back and forth to expose the arm surfaces inside the bushing.

-Apply new lubricant and I don't mean WD-40. I used Sil-Glyde, a silicone grease which has a working temp range of -20 to +400 deg F.

-Reassemble in reverse order.

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Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

Thats the description for the newer assemblies. The older assemblies have no catches underneath the rectangular housing and you have to remove the mouldings as stated.

Sorry about the delayed reply. I got it done as described by BusyBenz. Thanks! Your instincts are very different from mine . I would never have attempted to take the winshield strips out. Anyway, with any less instruction, I couldn't have done it. Thanks again to everyone.

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k. darkman
1987 300D Turbo 200k

With a small allen wrench inside the holes, I cannot seem to "feel" any catches inside to release. Can someone provide a little more detailed info on the proper technique to find and release these catches?

Good stuff haasman. Hopefully these steps will get my 1990's wiper back in shape. Currently fast speed is slower than slow speed (it almost stops!), and it's worst at the point where it extends up to the corners. I lubricated everything else but not the bit that extends it to the corners. Fingers crossed!

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner

I know this is an old thread but this may help anyone working on the older type monowiper system;How to grease 300E wiper gearbox.

Sorry to resurrect this old thread, but I just bought a 1994 E320T with about 138k on the clock and I'm methodically trying to address all of the problems that it has, and a slow wiper is one of them. I started to follow this procedure, but I didn't see any three-sided rectangular cover at the lower end of the arm. All there was was the big plastic cover over the whole transmission assembly, and when I snapped off the cover all the innards of the transmission were all exposed and nekkid for the world to see. This doesn't look right - am I missing some kind of cover plate? I'm attaching photos so y'all can see - but don't be ashamed...

I slathered grease all over everything I could reach but the wiper didn't seem to go much faster; I'm hoping it'll free itself up with use.

Attached Thumbnails

   

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Rob Fini
Silverphile Bleifuss Motorsports
'07 E350T 4MATIC, 158k miles
'99 E320 4MATIC, 248k miles
'97 C36AMG, 256k miles (gave to son)
'94 E320T, 221k miles
'94 E320T, 251k miles (RIP)
'92 Coachmen Van Camper, 142k miles
'84 300TDt 336k miles (RIP)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Future Vintage Racer)
'64 Plymouth Valiant V200 Convertible