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ddsprag's avatar
ddsprag
Explorer
Aug 04, 2016

Onan Quiet diesel generator 7500 HDKA

Ran all night shut off for couple hours restarted runs 5 minutes and shuts off. Does this with or without load. After 8 or 10 hrs, will run continuously. Could this be a fuel problem or electrical?
  • Over temperature sensor sounds suspicious. Latent engine cylinder head heat closing circuit keeping shutdown activated. Engines always gain temperature just after they are shut down after running long time. A bad sensor can act psychotic sometimes.
  • Yes 3 blinks and over half tank of fuel. It will restart run 5 to 15 minutes.
  • Could you tell me where overheat sensor is located ? Thanks for responding
  • You have to drop the genset and take sheet metal off.

    The bad news is they are famous for welding them selves into the block and requiring drilling and retapping to replace.

    There was a thread with pictures here a year or so ago.

    Might be something on youtube.
  • Would do more online exploration for you except I am trying to stiffen my upper lip for the Sharps Hospital cardiac ICU ER.

    Suggestion. Run generator for 5-minutes and shut down. Does it re-start? Then for 15 minutes, and a restart attempt. Have the generator under load. Then do it again for a hour. If it's a thermal hissy-fit, this is the hammer & chisel way of making it angry enough to diagnose.

    Goodbye Cruel World