W110 W111 W112 Sedan, BENZ AID - COMMON QUESTIONS AND ANSWERS

Alternator with new regulator/brushes cuts out at 3500 RPM

My alternator stoped generating (but no charge light while running) so I replaced the regulator/brushes with the kit available here. Now, when I drive around with a volt meter attached to the battery, I see that the battery is being charged until the engine hits about 3700 RPM and doesn't resume charging until the RPM gets below 3400. The cut-in and cut-out RPM remain the same reguardless of what gear the car is in (even Park) or what accessories are on or off (although this does affect the battery voltage a little).

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Chassis Model Number

W124

Front end shakes and rattles

I have a 1983, 300SD. At speeds around 60 to 70 mph I get vibration that fells like it is coming from the right front wheel and I also feel it thruogh the gas pedal. Also when making a right banking turn, (as in going from one freeway to another freeway), the front end will shake violently. This also feels like it is at the right front wheel. Can you give me any help as to what to look at and what to look for?

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Chassis Model Number

W126

82 240D will not start when warm

I have an 82 240D with >217,000 mi. This summer it started not wanting to start once it reached operating temperature. It seems like it is getting air in the lines, but if you let it cool down then it will start again. I replaced the flex fuel line from the tank and the one under the hood on the suction side. I then bought why my diesel will not start, lots of info, nothing specific to hot starting problems. I have since put in a used tubo starter and a new timing chain. The engine turns over faster and has more pep but still refuses to start when warm.

Chassis Model Number

W123

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Diesel Engine Specific Aid

Fuel Filter Replacemnent and other Difficulties- Be Prepared!

When my '82 300DT lost power on the freeway I managed to nurse it to my destination and got out my fuel spare filters. I installed a new prefilter and main filter, bypassed the FM10 water separator, pumped on the hand pump, and then found that the lack of a 17mm end wrench made bleeding the lines at the injectors real difficult as all I had was an adjustable wrench. Too bulky for that job. Then I screwed up by not reading Kent's instructions carefully and ran my battery down before the fuel lines were bled enough to get the engine going.

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Chassis Model Number

W123

Overheated rear brakes

I drove 15 mi to work, via high way, with e brake partially on. When I got there, the wheel was smoking. I pour gallons of water on them and let it cool down and drove again for about 10 mi. Now I found the brake didn't seems to returned after it's applied, the rear wheels would be almost fully locked after no more than 10 times of braking. The more the brake is applied, the the shallower the pedal gets. So I towed the car back home. What could the heat do to have caused my rear brake to stuck whenever it's applied?

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Chassis Model Number

W123

turbo oil line gasket and air cleaner bracket

I recently replaced my air cleaner bracket which required disconnecting and reconnecting the oil line from the top of the turbo. After reassembling everything, the turbocharger leaked oil. There's a paper gasket where the oil line meets the turbo, and I didn't know I'd have to replace it if I ever disconnect the oil line. I got a new one from a local M-B dealer, partnumber A 603 187 05 80, but it's the wrong size. I tried to use the gasket anyway by making cuts in the gasket, but I doubt it is sealed well or will last very long.

Chassis Model Number

W116

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Diesel Engine Specific Aid

timing gear breaks on 420 sel

Hi I am brand new to the forum. My name is Lewis in Nor Cal, I have owned a 1990 420 sel for 3400 miles now. IT has 200120 miles on it, 1 owner and is in perfect shape. Just did new rotors all around belts and oil change. I went to start it on 09/15 and I heard a big bang. opened the hood and found something had made a 2/3" hole in the drivers side vale cover right on top of the timming chain. the motor did not start during this time and has not since. I am going to do a compression check to see if any valves hit pistons etc.

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Chassis Model Number

W126

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