2k degrees Fahrenheit is way too hot. On my CAT 3208 pre-turbo I run around 900 degrees on the flat. If the gauge gets above 1300 degrees I start worrying. Limited air flow/enriched fuel will increase the temperatures substantially. At 2k you'll be melting your pistons in short order.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13