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Cummins/Onan — Service Procedure

For these Cummins/Onan models: MDKBK, MDKBL, MDKBM, MDKBN, MDKBP, MDKBR, MDKBT, MDKBU, MDKBV.

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Procedure

  1. 1. Prepare by closing the drain hose sea cock and disconnecting the hose from the water separator.
  2. 2. Conduct the test by opening the sea cock while keeping the hose raised to its fitting on the water separator. Requirement: There must not be any backflow while operating the boat throughout its speed range. If there is, relocate the through-hull fitting. 4.4.2 Dry Exhaust Systems A separate exhaust system must be provided for each engine. It must be isolated from all other engine exhaust systems. Do not "T" into any other engine exhaust system. Run the exhaust piping all the way to the hull and terminate it flush with or extended slightly from the outside of the hull (see Exhaust System Illustrations at the end of this chapter for schematic). CAUTION Corrosive exhaust vapors, soot, and high gas temperatures can migrate through a shared exhaust system and cause damage to idle engines. Provide a separate exhaust system for each engine. 32 981-0648 (Issue 9)

Source: manual:981-0648 Onan MDKBK thru MDKBV Installation Manual (10-2013).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.