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Home›Repair guides›Cummins/Onan›Flywheel Removal

Cummins/Onan 6.5NH - 3CR / 6000 A — Flywheel Removal

Repair & overhaul

For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.

Applies to: Cummins/Onan NH engine

Before you start

  • Do not drop the flywheel; a broken fin will destroy the balance.

Procedure

  1. Turn the flywheel mounting screw outward about two turns.
  2. Use a screwdriver behind the flywheel to take up crankshaft end play.
  3. Strike a sharp endwise blow on the head of the cap screw with a heavy soft-faced hammer to loosen.
  4. Use a suitable wheel puller to pull the flywheel.
  5. Always use a steel key for mounting the flywheel.

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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