W123, SVO/WVO parts

'83 300D, Knock: injector, rod or what?

Just bought a one-owner '83 300D with 116k verified miles. Service book was regularly stamped. Car starts instantly, idles perfectly runs great. Has 2.5 bar oil pressure at idle. But it has a definite knock. Took it to the local independent MB repair facility. Diesel mechanic has three 300D's himself. I used my infrared remote thermometer and showed him that the injector body of #1 cylinder was showing just 120-degrees. Other four 170-175.
Injector was removed and replaced. Good compression--in the 300's. Haven't had chance to recheck temp. Knock is still there.
Now I am told it is most likely a rod knock! I don't have the money to start rebuilding the bottom end of this engine. Plus I am surprised that a rod bearing would go with this low mileage.

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1984 300D Stalling

I have replaced all filters, including the one in the tank and all looked clean. I am still experiencing loss of power and then stalling as if a filter is clogged. When pumping the manual pump attached to the injection pump, it does not have pressure. It's like there is an airlock, but engine will start. I also checked the tank and it is vented. Any ideas? Thanks.

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