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Home›Repair guides›Cummins/Onan›Cooling System Disassembly

Cummins/Onan 3.6MKY / 4MKY — Cooling System Disassembly

Maintenance

For the Cummins/Onan 3.6MKY / 4MKY, from the Cummins/Onan service manual.

Applies to: Cummins/Onan 3.6MKY, Cummins/Onan 4MKY

Before you start

  • Never operate the genset with any cooling system components removed (overheating).

Procedure

  1. Inspect air inlet and outlet passages; remove access panel and inspect engine and control area.
  2. Remove genset if cleaning is necessary.
  3. Follow generator through scroll assembly removal procedures.
  4. Clean the fan hub assembly with a brush or low pressure compressed air; replace if blades damaged.
  5. Remove top and bottom air guide housings (cowlings) to access engine cooling fins.
  6. Clean the engine cooling fins and assemble in reverse order of disassembly.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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