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1991 Mercedes-Benz 420SEL Questions

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Timing chain broke after an oil change. The chain broke when I was attempting to start the vehicle immediately after the service. The chain then fractured the left valve cover. The chain, I believe, is now off of the sprockets. I can not see the chain through the oil fill opening as I could before the chain broke. The mileage on the vehicle is aproximately 125 K. I am not the first owner so I do know if the The engine never did start so I dont know if there is other internal damage caused by the chain break. I live in Astoria Oregon and found your services through USAA, my insurance company.
Two mercdes mechanics told me, I need to buy a new engine at a cost of $7000.00. advise d me to buy another car. What do you suggest? It has 260,000. It was running very nicely till car got overheated. Only second owner.
Decker model. 1991 420 sel mercedes
I have a 91 Mercedes 420 sel, am having issues with vehicle randomly surging while driving, almost like you lift off accelerator, if you push gas pedal, the fuel consumption gauge moves like you are flooring the gas, but the car doesn't respond, is ...
My light switch seems compromised. When I turn the switch the running lights do not work. My Brake lights work, the front right headlight works and my blinkers work as well. The front two lights only work when I switch on my brights. Is this a ground issue in the switch or just somewhere else in the vehicle? Also, none of my dash or gear selector lights work but the door lights work as well as the overhead cabin light. My fuses are all in check so I have no idea outside of my current knowledge. The vehicle as of now only has 152000 miles. Any insight would be greatly appreciated! Thank you for reading!
what is the voltage supposed to be on the fuel pumps
the car has not been cranked in 7 years I just bought it
When I am stopped at a traffic light. Oil pressure drops to number 2 and feels like cars gonna cut off. Also does a thumping noise and car vibrates. Put car in netural and it runs fine. Put it back in gear starts thumping noise. Drives normallay. Just at a stop does the thumb. Checked all fluids and everything is fine. This is the second time this has happened. Second time it started after I put gas in the car then it started the thumping and oil pressure needle jumbs up and down. When got to my desanation. Put car in park and runs like a champ. Dont understand whats wrong with it. Any ideas before I take it in?
SAME ISSUE WITH THE CAR DIFFICULT TO START. HAD TUNE=UP CHANGE FUEL PUMPS (2). WANT TO CHECK AIR MASS FLOW ISSUES BY CHECKING THE SENSOR WIRE BEFORE MOVING ON.
Need to replace alternator belt
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