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Old 07-03-2006, 04:41 AM   #1
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I tried the search function, but couldn't see that the question has been asked or answered: does your genset audibly "bang" when you start it up or shut it down? Mine does, to the point it just doesn't seem like it's good for the unit. It's an Onan on an 05 Vectra, about 150 hours, and so far as I know has had regular maintenence. I checked the fluids yesterday, and oil/coolant were at spec.

Does your unit bang as well?
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Old 07-03-2006, 04:41 AM   #2
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I tried the search function, but couldn't see that the question has been asked or answered: does your genset audibly "bang" when you start it up or shut it down? Mine does, to the point it just doesn't seem like it's good for the unit. It's an Onan on an 05 Vectra, about 150 hours, and so far as I know has had regular maintenence. I checked the fluids yesterday, and oil/coolant were at spec.

Does your unit bang as well?
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Old 07-03-2006, 05:29 AM   #3
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No bang for me. I have about 500 hours on genny and have never had a bang on startup or shut down. Mine is the 7.5Kw Onan that runs on the Kubota diesel.
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Old 07-03-2006, 05:47 AM   #4
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Thanks, Walt. Didn't think it was normal despite what the salesman said when I picked it up last weekend. Don't normally have to use it, so will have them look at it when it goes in later this month.
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Old 07-03-2006, 06:40 AM   #5
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I think that is the first line that they teach them in salesman school "Oh, that's normal"

And the second one is "this baby will get (insert wild mpg here) miles per gallon".
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Old 07-03-2006, 07:18 AM   #6
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What exactly do you mean by a "bang?" Our generator has a very noticeable low frequency rumble/shudder when first starting or stopping which to me just sounds like the result of the ignition/starting process. It has always done this and it runs like a Swiss watch after two or three seconds.

Sarge is so correct...

I always assume a salesman will lie to me either because A) there is an intent to deceive or B) they don't know the answer and don't want to appear ignorant and finding the correct response isn't important because that has nothing to do with making the sale.
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Old 07-03-2006, 07:22 AM   #7
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Mine exhibits the same sort of "bang" on shutdown. I've recently checked the mounting bolts but perhaps it needs to have the shock mounts replaced. Mine is a 2001.
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Old 07-03-2006, 07:23 AM   #8
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You can always tell when a salesman is lying to you....whenever his lips are moving
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Old 07-03-2006, 08:54 AM   #9
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I get a "bang" also. In this case I really do think it is "normal".
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Old 07-03-2006, 09:46 AM   #10
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by smlranger:
You can always tell when a salesman is lying to you....whenever his lips are moving </div></BLOCKQUOTE>

While that's certainly a "time-worn" phrase, it's not always true....

Regrettably, there are "bad apples" in every line of work,whether it's RV or real estate sales or even health care management...

Thankfully, I truly believe I've found a salesperson that has not only the DEALERSHIP's best interest at heart, but the best interest of the customer as well.
In my last experience, while the service manager and his department were really good, I became disenchanted with the treatment I received from the salesman....

Gary, I believe in his case he fit your analogy....
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Old 07-03-2006, 11:35 AM   #11
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It's not unusual for a genset to kind of shuuder as it starts up or shuts down. My guess is that your "bang" is either a fuel line or exhaust pipe getting stressed or de-stressed during that moment of shudder/vibration. Maybe thhe exhaust pipe hits a support as it moves a bit?

Can you have someone else start the genset while you watch & listen closely?
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Old 07-03-2006, 12:56 PM   #12
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The 7.5 Onan in my Vectra shudders as you describe from time to time...Has always worked great!!
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Old 07-03-2006, 02:01 PM   #13
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I think my shudder could be include a "bang"
It's a 7500 Onan Diesel
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Old 07-03-2006, 03:06 PM   #14
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I have the 7500 and it also shudders. But works great.
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