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Old 07-15-2015, 03:02 PM   #1
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Ran the Onan 7.5 for four day straight...

It only had a couple of instances for cool down during the eight day trip down south. Never gave me a lick of trouble. Gave her the Royan Purple fully synthetic oil/filter change the day after getting back. Purrs like a kitten...
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Old 07-15-2015, 04:33 PM   #2
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Running generators for several days, is good for them, as long as a good load is also being pulled. When we have to run our generator for extended time periods, I shut it down once a day to check the oil and anti freeze levels. I also watch my 'running' time and make sure that I change the oil/filer and fuel filters.
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Old 07-15-2015, 04:58 PM   #3
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Bad Bolt,

What is the socket size that you used on the drain plug?

The brass is very soft and they are easy to strip (don't ask me how I know!).

Thanks!
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Old 07-15-2015, 06:00 PM   #4
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I'm not sure. I did one of those look at the drain bolt and then guess which socket looked right without looking at the size. I think 9/16"

But, I've seen 7.5's with 3/8" plugs that are smaller in size than my own is.
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Old 07-15-2015, 06:00 PM   #5
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I changed my oil and filter on 7500 Onan today, and it's a 3/8 bolt for the oil drain..
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Old 07-15-2015, 06:14 PM   #6
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As a drag racer, I can tell you that most racing weekends mean starting it up when you leave the house, and shutting it off when you get home three days later. All summer long.
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Old 07-15-2015, 08:38 PM   #7
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"Gave her the Royal Purple fully synthetic oil/filter change the day after getting back."

Not to get people in a wee wee contest about oils, but how long have you been using
Royal Purple in your generator? Do you also use it in your coach motor and tranny?
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Old 07-16-2015, 06:21 AM   #8
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To the OP, 9/16 is what it looks like on mine.

Will be trying it later on this week as I am due for a change.
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Old 07-16-2015, 07:08 AM   #9
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Mine was 9/16 also be sure to use 6 point and not 12.
Also heard they used a smaller size that stripped really easy.
The larger 9/16 is brass and will strip mine was not looking that good and next oil change will get replaced.
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Old 07-16-2015, 07:16 AM   #10
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I ran my 10K for 86 hours straight two weeks ago. I was at a race venue in San Angelo, TX, with temps around 95. I ran 2 or 3 AC's the whole time. I also shut it down each morning to check oil and coolant. The best I can figure is it averaged about 0.5 GPH.
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Old 07-16-2015, 08:48 AM   #11
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Quote:
Originally Posted by okie143 View Post
"Gave her the Royal Purple fully synthetic oil/filter change the day after getting back."

Not to get people in a wee wee contest about oils, but how long have you been using
Royal Purple in your generator? Do you also use it in your coach motor and tranny?
First time for any full synthetic oil for the generator. I have only used Rotella T mineral based oil until now. Same goes for the 5.9 24v Cummins. I am going to go fully synthetic in the 5.9 after I have my head gasket replaced to address a coolant and oil leak, if all checks out with the head and block inspection when they pull the head. I will try and find that oil on sale and stock up.
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Old 07-16-2015, 12:58 PM   #12
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I see folks worrying "Is it ok to run my Onan for 4,6,8,10, more Hours at a time?

They are designed for like 500 hours between oil changes.

You have to shut 'em down to change oil and filter

Otherwise they can run till YOU drop.
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Old 07-16-2015, 01:32 PM   #13
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Originally Posted by wa8yxm View Post
I see folks worrying "Is it ok to run my Onan for 4,6,8,10, more Hours at a time?

They are designed for like 500 hours between oil changes.

You have to shut 'em down to change oil and filter

Otherwise they can run till YOU drop.
150 Hours for the oil and filter change.

500 Hours for fuel filter and air filter if memory serves.
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Old 07-17-2015, 05:58 PM   #14
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My Onan manual says change oil every 250 hrs. Fuel and air at 500.
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