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Old 08-29-2011, 07:15 PM   #1
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Onan HDKAJ ??

Our genset is an Onan Quiet Diesel 7500 model HDKAJ. Part of the 1000 hour maintenance is to clean the soot from the spark arrestor. To perform this the plug must be removed by using a 10" extension with ratchet and socket from under the genset. I can't get the plug to budge. Very difficult position to apply PB Blaster or Kroil. Anyone have a solution?? Thanks
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Old 08-29-2011, 07:38 PM   #2
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Impact tool or a long breaker bar and tap it with a hammer to break it loose.
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Old 08-29-2011, 07:44 PM   #3
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I agree with the breaker bar. I have removed several of those plugs for myself and friends and a long breaker bar always breaks it loose.
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Old 08-29-2011, 07:45 PM   #4
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Quote:
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Impact tool or a long breaker bar and tap it with a hammer to break it loose.
I thought of that but am concerned about survival of the muffler.
The impact may be the answer.......thanks
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Old 08-29-2011, 07:52 PM   #5
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After I got mine loose, I put a little Never-Seize on the threads so it always comes out easily now.
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Old 08-29-2011, 10:22 PM   #6
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If you have one, the impact wrench is better than using a long breaker bar. The impact wrench will "rattle" it out without applying a lot of torque over a long period of time. Much less likely to damage it.
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Old 08-29-2011, 10:25 PM   #7
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The impact air wrench sounds like the plan for tomorrow. Thanks for the help guys.
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Old 08-30-2011, 04:08 PM   #8
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Yep, an iimpact wrench got the job done
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Old 08-30-2011, 04:23 PM   #9
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I would try to finesse it out before using brute strength. Maybe penetrating oil in a squirt bottle and let it fly. If it doesn't work then go with brute strength.
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Old 08-30-2011, 04:48 PM   #10
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Yep, an iimpact wrench got the job done
Never did mine at 1000hrs, didn't know there was one in there. Did anything come out?
Richard
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Old 08-30-2011, 07:56 PM   #11
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I was told by an Onan tech it is safer to NOT try to remove the plug because of the inability to replace it if iit doesnt go well...Instead he said to run the gen at as full a load as possible for 1 1/2 hrs to clean it out
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Old 08-30-2011, 08:15 PM   #12
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I was told by an Onan tech it is safer to NOT try to remove the plug because of the inability to replace it if iit doesnt go well...Instead he said to run the gen at as full a load as possible for 1 1/2 hrs to clean it out
Thanks, I feel a little better now Will try his/her suggestion.
Richard
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