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Cummins/Onan — It is recommended that the engine-heat exchanger

For these Cummins/Onan models: MCGBA, MCGCA, MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC, MDGDD.

Applies to: Cummins Onan Mcgba, Cummins Onan Mcgca, Cummins Onan Mcgda, Cummins Onan Mcgdb, Cummins Onan Mcgga, Cummins Onan Mdgda, Cummins Onan Mdgdb, Cummins Onan Mdgdc, Cummins Onan Mdgdd

Procedure

  1. 1. If the set is heat exchanger cooled, prime the sea water pump by disconnecting the pump outlet hose and pouring water into the pump outlet (Figure 5-4). Reconnect the hose and open the sea cock. CAUTION The sea water pump has a neo- prene impeller that can disintegrate in a matter of seconds after the engine starts if pump prime has been lost.
  2. 2. Fill coolant until the expansion tank is approxi- mately half full. Bleed air from any air vents in the system while filling coolant.
  3. 3. Run the engine while watching the coolant lev- el in the expansion tank. (The level will drop as remaining air in the system escapes). Add coolant as necessary so that the expansion tank is full when the engine reaches normal op- erating temperature. Secure the pressure cap. WARNING To prevent severe scalding, al- ways let the engine cool down before re- moving the coolant pressure cap. Turn the cap slowly, and do not open it fully until the pressure has been relieved. Changing Coolant Change the coolant in accordance with the Mainte- nance Schedule in this section. Follow the instruc- tions in the engine Operation Manual for cleaning the system. DISCONNECT THE HOSE FROM THE PUMP OUTLET TO PRIME THE SEA WATER PUMP FIGURE 5-4. PRIMING THE SEA WATER PUMP Redistribution or publication of this document, by any means, is strictly prohibited.

Source: manual:960-0151B Onan MCGBA CA GA DA DB DA DB DC DD Operators Manual (6-2000) .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.