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Hercules — Install the nuts and washers as removed.

A Hercules service procedure — check it applies to your exact model before use.

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Procedure

  1. 17. Install the thermostat, thermostat housing, water pump by-pass hose
  2. and connect the water temperature gauge thermocouple and water

Source: manual:HERCULES D4800 Maintenance Manual .pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.