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This often points to retarded injection timing. The manual shows exactly how to use a dial indicator on the injection pump’s timing port to set BTDC (typically 12–14 degrees).
If you're doing a full rebuild, print pages 147–162 (overhaul sequence) and laminate them for your shop bench. Also – don't guess the injection pump timing. Use Section 4B.
“Saved my forklift from the scrapyard. The injection pump timing section alone was worth the download.” – Mark R., warehouse manager