W115, USED Diesel Engine

1975 300D Eventual Loss of Power

I have an approximate 45 minute commute to work. At about 30 minutes into the commute I detect a little surging at highway speeds. This has occured over the past few days. Temperatures are in the low 40s. Yesterday, I experienced severe loss of power limiting my highway speeds to 35 MPH. At lunch time drove to dealer with no problem (15 minute ride) with no loss of power (90 MPH). Dealer ordered a fuel filter. On my way home I experienced severe loss of power (worse than the morning commute)to the point of having to stay off the highway.

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Diesel Injector Seat Cleaning

1976 W115 300D
Do you recommend a specific tool, chemical, or (wire?) brush etc to clean the metal seat where the Diesel injector crush washers mount onto/in the prechamber? There is apparently a thin "film"/spots of thin carbon? very hard carbon in this area that seems to be very hard to completly remove, when attempted to clean this area. Some of this thin film of carbon? appears to remain after wire brushing with a small wire brush. I am looking for the proper tool , chemical and or procedure for cleaning this area.

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