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Onan 7.5DKDFL - A good fit for me?


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  #31  
Old 02-24-2016, 12:17:34 PM
Radarman Radarman is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

There was a recent discussion regarding temperature around here. In general, temp is pretty important and should get hot enough that the moisture in the oil has a chance to evaporate which means an oil temp of 212 or so degrees. Since oil usually runs ~30-40 degrees hotter than the coolant, I would say you should make sure the engine coolant heats to at least 180 or 190.
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  #32  
Old 02-24-2016, 12:24:31 PM
DieselBound DieselBound is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

Quote:
Originally Posted by Radarman View Post
There was a recent discussion regarding temperature around here. In general, temp is pretty important and should get hot enough that the moisture in the oil has a chance to evaporate which means an oil temp of 212 or so degrees. Since oil usually runs ~30-40 degrees hotter than the coolant, I would say you should make sure the engine coolant heats to at least 180 or 190.
Yes, I'm going to measure the temp to rule in/out the thermostat.
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  #33  
Old 02-24-2016, 12:57:10 PM
Radarman Radarman is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

Yep.. I am still a bit shaken when I discovered that my boat thermostat destroyed itself and was running full open last season. I just thought the temp gauge was bad and reading low. I was running the engine pretty hard the last time I was out. Had it wrapped up to 4500-5000 rpm and I bet the engine was only 140-150 max.



Dont be me.
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  #34  
Old 02-24-2016, 01:21:25 PM
DieselBound DieselBound is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

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Originally Posted by Radarman View Post
Yep.. I am still a bit shaken when I discovered that my boat thermostat destroyed itself and was running full open last season. I just thought the temp gauge was bad and reading low. I was running the engine pretty hard the last time I was out. Had it wrapped up to 4500-5000 rpm and I bet the engine was only 140-150 max.



Dont be me.
I've never had a problem with my Kubota tractor; actually, it's usually the opposite because I have to keep cleaning the radiator screen. And speaking of radiator blockages, the seller of my generator had this 2-cylinder Kubota from a refrigerator truck that he hooked up to a water pump that would run all day long. His wife was out checking their cattle and discovered that the fan belt on the engine was melting down (or some other ugly sight). The radiator neck and cap got blown off. Apparently one of his kids did some mowing and kicked a bunch of crap into the radiator. Anyway, he checked things over and found that the engine hadn't seized. He ended up firing it back up and it's been working fine since. Kubota engines are hard to kill!

Running at only 1800 rpm (and flowing a pretty good amount of air) it's a bit trickier to get these things warmed up. Not good to have a cold diesel (any engine really). I'm pondering whether I want to make some side panels, mainly for protection from the elements, but wonder whether how this will affect the running temp. Cooler part of the year is when this thing is most likely to see action: may get down into the mid to higher teens, though that's infrequent (mid twenties is more common).
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Old 02-25-2016, 04:22:25 PM
DieselBound DieselBound is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

I'm going to go ahead and order up some stuff to connect the generator up to my main breaker panel (via interlock- http://www.ebay.com/itm/221368654965). Not sure if I'll need to rewire the 240v outlet on the generator or not, but I know that I'll need a locking receptacle; so... will this one be good to go with?

http://www.ebay.com/itm/131589664804

On my main house panel side I'll be going with this:

http://www.ebay.com/itm/371435705555

I'll use this cord to connect with:

http://www.ebay.com/itm/261237252632

Not promoting or endorsing any of these items, they're just what I figured would work for me.
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  #36  
Old 02-25-2016, 05:05:26 PM
Isaac-1 Isaac-1 is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

Looks like a good plan
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  #37  
Old 02-25-2016, 10:58:34 PM
DieselBound DieselBound is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

Attaching a picture of what I found when opening up the add-on breaker panel. The tied middle 20 amp breaker supplies the 240v outlet.

I'd like to have a full 30 amp available to the 240v outlet and still have a 120v outlet. Not really sure yet. Likely have to change that panel to achieve that. The wires to the outlets seem to be 12 ga. Would that still support a 30 amp 240v outlet? (12 ga = 16 amps; times 2 wires = 32 amps for 240v?)
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  #38  
Old 02-26-2016, 01:36:19 AM
DieselBound DieselBound is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

Yikes! Never mind on the question about wiring the 240v for 30 amp, that should be 10 ga minimum!
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  #39  
Old 02-26-2016, 02:43:37 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

You need to post a few pictures of the output wires coming off the generator end. they should be bigger than #12. Run new wires connected to the gen. output wires to the aftermarket breaker box you have a picture of.

My 7.5 DKD has a ganged pair of 35 Amp. breakers mounted in the control box that I believe are factory installed. You can see the breaker on the left side of the control box under the voltage regulaton transformer on post # 29


http://www.smokstak.com/forum/showth...=140411&page=2
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Old 02-26-2016, 11:53:45 AM
Radarman Radarman is offline
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Default Re: Onan 7.5DKDFL - A good fit for me?

I would think 35A breakers are just fine. that means you will throw the breaker at 8400 watts which is probably just fine. I have seen a few 7500 watt generators with 35A breakers. 30A breakers will allow 7200 watts which is a bit under your max. Since these generators are so overbuilt, pulling a few extra amps will likely not hurt a thing. I am thinking of upgrading my 30's to 35's on my 7500JB.

Here is how I wired my set providing single phase 120 and 240. I ran a dual throw 30A breaker as the main with both hots running through this. I then ran from the 30A main breaker directly to the L14-30 plug providing 30A 240v. I also went from the 30A main breaker to another small box with two additional 20A breakers and two 120v plugs. This way, ALL power runs through the 30A main breakers, and I also run 20A breaker for the 120v. I can use either 120 OR 240, and will not overload the generator.
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