W126, BENZ AID - COMMON QUESTIONS AND ANSWERS

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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Diesel Engine Specific Aid

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W123

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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