Welcome to the forum.
If you post photos of the front of the engine we can help identify it.
Forum member Anders sells 12mm injection pumps.
Yes, a good oil cooler would help control temperatures during sustained loads, good radiator probably just as (or more) important. Also, possibly a lower temperature thermostat, and overdriven water pump.
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1985 744 gle d24t
1985 745 gle d24t
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