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Onan 15kw help


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  #1  
Old 03-09-2017, 01:21:39 PM
kosmo101 kosmo101 is offline
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Default Onan 15kw help

HI
So purchased an ice cream truck with what I think is a 15kw Genset JB model. Huge unit. I am more familiar with the smaller units so a bit overwhelmed on this. Hoping i could get some help.

So the old owner told me he shut the fuel off. I seee what looks like a clear fuel bowl..assuming thats a fuel filter. Has a brass spinner on bottom. Then looks like a fuel pump then to the carb/fuel bowl with a petcock. Also another spinner on left end of carb. how best to set these?

Fuel bowl seems to drop at times.. assuming the bowl is overloaded. We had a dead battery and tried to jump it and i guess fuel bowl got extra full?

Will get serial # today.

thanks
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Old 03-09-2017, 04:16:48 PM
grif grif is offline
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Default Re: Onan 15kw help

Full Model and full serial number will get all lthe information you need.
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Old 03-09-2017, 05:27:55 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 15kw help

Yes, model & ser. numbers, inc. spec. letters at end of model #.

If it is 15 KW, it will likely be a JC not JB. JC is 4 cyl. JB is 2 cylinder.

A picture of what you are talking about would be good. The gasoline JC carb has 2 "adjustment" screws, one on top (low speed adjustment) and one on the bottom of the carb bowl (high speed adjustment). Before you mess with them, download the manual from the link below.

http://www.twinslan.net/~n0nas/manuals/onan/

Try manual #967-0500 for starters. When we know your model # we can direct you to the exact manual.
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Old 03-09-2017, 09:47:24 PM
kosmo101 kosmo101 is offline
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Default Re: Onan 15kw help

its in such a tight spot that i dont know i can get to where the plate is. its in the back of an ice cream truck.

So I replaced battery and she fired up. OMG.. this thing is incredibly loud. I mean to the point that there is no way i could use this truck as is at events. it is just too loud. I checked and looks like a muffler under the truck but the sound you would think there is no muffler. im going to take a video tomorrow and post it. I wonder how loud it should be. it has some funky metal pipe to the muffler. I thought on these JB 15kw units there was exhaust coming out the top on the back of the unit.

Also he has some odd metal tube thing out to a vent from the top of the fresh air side. Trying to figure out what it is. Not very visible in this photo. will see if its for fresh air or some exhaust type of thing....
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Old 03-09-2017, 10:03:07 PM
Wayne 440 Wayne 440 is online now
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Default Re: Onan 15kw help

Loudness is a very subjective issue. JCs are louder than today's water cooled, sound attenuated sets by a considerable margin, even with a decent exhaust system. The rating plate probably "was" in the area indicated by the red outline.
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Old 03-09-2017, 10:06:37 PM
kosmo101 kosmo101 is offline
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Default Re: Onan 15kw help

Wonderful. So obviously this thing is amazingly dirty which i will clean up.

But ive been around many smaller generators from honda to generac and others. Sure i understand this is subjective. I just cannot believe I can use such a loud unit when selling ice cream. ive been around similar types of trucks up north and they never sounded nearly like this one. I will get a video. It is so loud it gives me a headache.. i swear it sounds like there is NO muffler that is how loud.

thanks
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Old 03-09-2017, 10:11:37 PM
Wayne 440 Wayne 440 is online now
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Default Re: Onan 15kw help

The exhaust manifold can be turned to point the outlet down, and then all that is needed is a hole in the air shroud for the pipe exit. I have seen some that looked like they beat the hole out with a hammer and cold chisel.

---------- Post added at 08:11:37 PM ---------- Previous post was at 08:08:31 PM ----------

It is entirely possible to use a JC in an ice cream truck. See one member's adventure with same here -https://www.smokstak.com/forum/showthread.php?t=105000
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Old 03-09-2017, 10:11:47 PM
kosmo101 kosmo101 is offline
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Default Re: Onan 15kw help

going to try to trace out exhaust.. you can see the huge piping on the bottom left of my photo which goes out the floor of the truck and into a muffler. Not sure of the condition but will check it out.

I will take a video of the loudness.

thanks
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Old 03-09-2017, 10:17:59 PM
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BigBlockChev BigBlockChev is offline
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Default Re: Onan 15kw help

The majority of the noise is not from the muffler it is from the engine. Don't expect it to get much quieter by just changing the muffler. It is a vacuflow cooling system so you will need to properly connect the discharge on the front of the engine to the outside air and also provide some inlet airflow louvers, don't make them too small. The key to noise reduction is to seal up the generator compartment except for a baffled inlet and outlet. Lining the generator compartment with sound deadening material will help somewhat as well. It is possible to quiet down an aircooled JC but it won't be easy unless you have very good attention to detail, sound will leak out everywhere it can through little holes. Cheers Dan
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Old 03-09-2017, 10:47:45 PM
kosmo101 kosmo101 is offline
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Default Re: Onan 15kw help

Is there a quieter generator out there.. whether from Onan or some other.
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