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Old 09-08-2007, 01:59 PM
Registered User
Join Date: Jul 2004
Posts: 93
stuttering rear window

Well hello!

My passenger rear window on my 1984 300D goes "buh-buh-buh-buh-buh" when i "roll" it up (its electric). Going down is not as smooth as it should be, but going up definitely vibrates, bounces, and at the top the motor will continue to run.

Anyone out there had a similar problem, that could offer some insight betfore I take my door apart? Thanks for your time,

1984 300D "Brown (and Blue) Betty" Over 200k but the odometer isn't counting
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Old 09-08-2007, 02:08 PM
Elegantly Insane
Join Date: Jul 2007
Location: Houston (Katy Area)
Posts: 142
My rear pax side door window makes the same noise...My Indy claims its the motor going out..We'll see, too hot to roll it down now anyhoo...


1981 300D W123 "China Blue" 193K
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Old 09-09-2007, 12:37 AM
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Join Date: Jun 2005
Location: Columbia, Missouri
Posts: 643
My drivers side front window did the same thing. It's my new to me 1978 300D. Well, about the third or fourth time I heard a pop/clank and now the window moves up and down by hand only. I hear the motor but no effect on the window. Search suggests the regulator has died. I'm hoping the track has separated from the window and i can just glue it back. Looking forward to more experienced opinions on this.

1979 240D manual
1978 300D manual
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Old 09-10-2007, 10:59 AM
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Join Date: Jul 2004
Posts: 93
i like the glue and track idea. i guess i should start pricing regulators just in case, though. thanks for the ideas.
1984 300D "Brown (and Blue) Betty" Over 200k but the odometer isn't counting
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Old 09-10-2007, 02:54 PM
Fuzzball's Avatar
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Join Date: Jan 2004
Location: Central Texas
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My pass rear did the same until about 6 months ago, now it doesn't do anything....I'll get to it one of these days...
1998 W202 C230 - The money pit of late.
1984 W126 300SD (356,800 miles) Gone to the wrenchapart
1984 W123 300D Gone to the wrenchapart
1972 W108 280SE 3.5 (sold but not forgotten)
1986 Buick Grand National 3.8l Turbo (86k miles)
1966 Glassic Model 'A' Replica
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Old 09-10-2007, 05:24 PM
RML RML is offline
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Join Date: Jun 2006
Location: Southwest PA
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My left rear does this. I haven't taken it apart yet to see what is going on, as I need to do some more important maintenance stuff. I have been avoiding using it if I can. I will be watching this thread to see what is going on. The frequency of the bub-bub-bub seems like it would be a gear in the motor.
85 300D 72K Anthracite Grey (Rutherford) 0-60 in 13 seconds
84 300D 331K Black (Rufus) 0-60 in 14 seconds (adjusted the ALDA)
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 22K
98 Ford Taurus 62K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60
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Old 09-10-2007, 07:16 PM
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Join Date: Oct 2002
Location: Bay Area No Calif.
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Originally Posted by Da Hawaiian View Post
My rear pax side door window makes the same noise...My Indy claims its the motor going out..We'll see, too hot to roll it down now anyhoo...


1981 300D W123 "China Blue" 193K
Your indy is way off, its the regulator that needs replacing. Usually the motor is OK but its the shape of the frame that constitutes the "regulator" that causes the odd noises and irregular motion.
The 123 regulators are made of pot metal that warps when the windows are topped up and the button held a little while to be certain the windows are all sealed up nice and tight. Place your leg against the door panel on a good working 123 and feel the panel push out when the window is raised up. Things get pushed out due to the force of the frame carrying the glass and its friction in the window channels.

OTOH if one lowers the window glass after is is topped out and leaves a small air gap at the top the regulators might last a hundred years.

The gub gub noises are when the motors' gears have eaten out the teeth on the arc shaped part of the regulator. Very common in older 123's
'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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Old 09-10-2007, 10:43 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
Dieseldiehard is correct in what he says about the regulator warping when the window is in the closed position. the motor tweeks the regulator, you can see it when the door panel is off and the window is run up and down.
I tap the switch after the window is up to take the pressure off it.

My drivers window quit a few years ago. it was the regulator that broke. there are two rivits that hold the center part together, and they snapped off. probably could replace with a couple bolts and then tack weld.

I think the new reg was $135.00 from my indie. could get one from the junk yard, but then most of that stuff is 22 yrs old and older.

Just click on parts and get from Fastlane.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 09-11-2007, 02:25 AM
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Join Date: May 2004
Location: Sunnyvale, Texas (DFW)
Posts: 9,673
No doubt about it, the two above are correct. Usually the pot-metal regulator is cracked or warped. I reformed one, but have had two others cracked and useless. Motors and their gears seldom fail. When the regulators deform, the teeth of the motor gear and the regulator teeth don't line up, ie: gears don't mesh correctly, and pop pop pop pop.......
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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