Questions and Answers

300SD Cruise pulses to beat of blinkers

1984 330SD I have noticed that when I run with cruise on it behaves perfectly. However, if I signal a lane change with the cruise on the cruise control "pulses" the enginge speed exactly to the rythm of the turn signal. I can only assume electric but I am not sure as I am still learning MB behavior. It is kinda' funny actaully but is annoying (it is not voilent but it is like someone lifting the pedal and re-applying it) Thoughts? Doug in TX

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300SD - Ok Just what brakes do I have?

I have an 84 300SD (126) and have a question. My shop that is helping me with my car said that my brakes work great (and they do) but the pads are worn. I have read here and in other helpful forums that it can be hard to tell whick brakes your car has (ATE,Bendix etc). Is there a way I can tell what brakes I have so I can order the right replacement pads. I am all fired up now and want to do that on my own also. Thanks in advance guys, Doug in Dallas P.S. I got the new primer pump and it was a super easy install. It works really great and does not leak. Thanks again for that.

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Transmission vacuum shifting valve keeps dying

I've got a 81 300D. The transmission vacuum shifting valve went bad & it started shifting hard & going back & forth between gears. I replaced it with a good valve off my 'spare parts' car. The transmission started shifting like perfect again. However, after maybe a month the car is shifting hard again. I suspect something on the car is killing this valve.

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84 300SD slightly rough idle with minor smoke from exhaust

Hey there. Quickly I have an 84 300SD. It is in VERY good condition, everything works (kinda scarry) AC,cruise,acutmatic climate control, I mean it is in really excelelnt shape all the way around. 139k miles and I bought it a few months back. I have done your diesel purge, paid a very reputable shop to do a vavle adjustment and they replaced a vacuum pot that was causing a little shifting gremlin. Anyway all is fine except that a new glitch has occured. I started the car the other day and the idle was a bit rough. Nothing earth ratteling but I also noticed that there is a little smoke coming form the exhaust and ther used to be quite literally none that you could see.

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1981 300D: Valve adjustment = shifting problems

Short story - a rushed valve adjust on a 1981 300D. While moving vacuum box attached to top of valve cover, ALL five vacuum lines became dislodged. And no, I didn't jot down a diagram or take a photo first. So, I put the lines back in as best I could remember, but now the inevitable shifting problems have appeared. Seems fine on level, but not so hot on hills (revs as if slipping intermittently, doesn't shift or downshift correctly some times). All was just fine before the valve adjust. And I can't find any other dislodged lines or cracked lines/connectors. I know little of this, but it seems the positioning of the five vacuum lines leading to the rubber block attached to the valve cover box is critical.

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OM636 circa '85 top end service

Hi guys, I don't plan to take this forum off on a marine tangent but I have just bought a small 1985 motor sailer powered by a marinised Mercedes OM636 which appears to have had very little professional service, ever. Sticking to the similarity of the engine to all the older four cylinder diesel Mercs I am confident that the Fast Start Glow Plug conversion is an immediate requirement as she is a very slow, and then lumpy, starter. My question then is, what special tools (if any) are required to remove and decarbonise the precombustion chambers? Obviously I will have injectors serviced etc but what other matters should I be looking at whilst picking out the black bits? Which of the manuals you have produced will be the most help to me in getting this engine back up to spec?

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