Just bought my MB, a '80 240d. Guy owned five MBs and had never had or did a valve adjustment. All had 200k miles plus on them. So, after buying the car I did a lot of research and when prepping for the adjustment I had notes, a diagram so I wouldn't forget what valve I was doing, my netbook with two pages on adjustments, and all the tools (even the special bent wrenches.) So: I mistakenly thought the starter was the power steering pump and turned that nut to turn the engine. It actually worked for about 3/4 a turn. Then the belt kept slipping (that's what I hope happened.) Then I went back to my Haynes and other resources and tried the nut at the front of the camshaft. Wouldn't budge. Then I tried the powersteering nut, which I didn't want to do, as I've seen the warnings posted here and on other sites. I tried the nut that is between the radiater and the engine (camshaft pulley?). Wouldn't budge. So, I did the trick of jacking the car up in the rear, putting it in fourth (a manual trans), and the tire wouldn't budge. E-brake is off, btw, with bricks around all the tires. What am I missing? I replaced the gasket, but wanted to do the adjustment, as I can hear that the engine needs it (and the history of the car/and owner would suggest it's worthwhile). Also: after putting it all back together after not even getting to start the adjustment, when I started the car it now makes quite a racket: knocking as if there is no oil, like in a gasoline car. I am trying not to panic, I did take it for a drive after and it runs as it did before, just loads of knocking. Please, some words of advice! I have searched for my situation on this site and others, as well as google-ing it but may be describing it wrong: I know how you all get frustrated with folks who just ask without even looking into it. Thanks in advance. The ?s are how to turn the engine. And what could knocking be after just taking of the valve cover. and also: can I do the adjustment and not have to replace the gasket again, I mean, does taking off the over make the gasket get out of shape, hence requiring a fresh one to seat again properly?