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After the engine was overhauled I shipped it from Alaska to Seattle. After several weeks of driving I notice the engine running rough, so I pulled into a Mercedes shop in Bakersfield, CA and had them look at the engine. I know they replaced a couple of injectors, but not sure it they set the timing to 18 degrees, or if the shop that rebuilt the engine set the timing. Yes, I am using the drip tube method of checking the timing.
I'm attempting to learn the engine and how to improve its performance. It seems to be getting sluggish when pulling into traffic. I've cleaned and checked the injectors, patterns and pressures are good. I've set the valve clearances. Then, reading an article led me to check the injector timing, that led me to question chain stretch.
Chain stretch show 15° ATDC for .078" valve movement. The shop manual indicates 13.5° for a chain from 20,000 miles. I guess my stumping questions to myself is 1.5° beyond the 13.5° telling me I need to replace the chain, and would that be why the injector pump was set at 18°? And, how do I replace a timing chain?
Cam sprocket pictures as requested. Also notice the cam shaft doesn't have any code stamped on the back, but does have these number on the shaft; 616051 22VV B4
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