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type cdo 21647 onan generator


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  #1  
Old 08-21-2011, 11:13:42 AM
longgun708 longgun708 is offline
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Default type cdo 21647 onan generator

I have a type cdo 21647 onan generator and I know very little about it other than it was used to power navy communications radios (tbw-5) The tags read: TYPE CDO-18010-A SERIAL # 182428 4 H.P./4 CYCLE/2 CYLINDER/ 2,666 R.P.M. MANUFACTURED FOR: NAVY DEPARTMENT-BUREAU OF SHIPS/ BY D.W. ONAN AND SONS CONTRACTOR: WESTINGHOUSE ELECTRIC AND MANUFACTURING CO. TYPE CDO-73004-B SERIAL# 880 GASOLINE ENGINE GENERATOR SET 190 POUNDS A UNIT OF MODEL TBW-5 RADIO EQUIPMENT

I looked at an older post on here and it didn't tell me any more than what I just related here. Does anyone know of a manual that tells how to run it? What type of oil does it use? Do I have to have a battery hooked up to it to run it? If so where do I hook it up? Any help would be appreciated.
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  #2  
Old 08-21-2011, 06:09:43 PM
K D Redd K D Redd is offline
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Default Re: type cdo 21647 onan generator

I KNOW NOTHING of your unit but from the rated RPM I would say it is a DC unit as 2666 RPM does not work out to either a 60 HZ or 400HZ machine UNLESS the generator is BELT driven by the engine.

Kent
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  #3  
Old 08-21-2011, 07:12:05 PM
Wayne 440 Wayne 440 is online now
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Default Re: type cdo 21647 onan generator

Here is a page with a few specs. Looks like it produces DC and 800hz AC.

http://www.hnsa.org/doc/ecat/cat-1129.htm
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Old 08-21-2011, 08:52:20 PM
longgun708 longgun708 is offline
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Default Re: type cdo 21647 onan generator

Thank you. That is the most information that I have seen on the piece. Thank You. I don't know why I didn't come across that in my research..

It does not appear to be belt driven. How do you translate the frequency (hz) to RPM? (Aside from the tag) is there a conversion that you use? I was told that it is 800 hz and on a tag it says 120/800 so that makes sense.
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Old 08-21-2011, 10:55:28 PM
Jack Hottel Jack Hottel is offline
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Default Re: type cdo 21647 onan generator

Reading the referenced document it clearly states that it is a directly driven 4 pole alternator, turning at 2,666 RPM, with an output of 800 Watts at voltages of 120, 1, and 800 volts which would be AC and a DC output of 280 Watts a 14 volts. The AC output frequency based on this data is 88.86 Hz, which is computed by the following formula:
Frequency = (RPM)(#of poles)/120
F = (2666)(4)/120 = 88.86 Hz
Jack Hottel
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  #6  
Old 08-21-2011, 11:12:17 PM
Wayne 440 Wayne 440 is online now
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Default Re: type cdo 21647 onan generator

Based on the motor specs on the same page, 115/230 /1/25 and 115/230 /1/60, for 25 and 60hz motors, I believe that the 120/1/800 term equates to 120v/1ph/800hz.

With any luck, the OP will get it running and tell us what the frequency is.
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  #7  
Old 04-18-2013, 09:32:47 PM
yellowlister yellowlister is offline
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Default type cdo 21647 onan generator

picked one of these up today.. missing parts.. but has great compression.. someone tried to make it electronic ignition by useing two what looks to be denso coils from a dirt bike or such.. couldent pass it up..

tag says 120/1/800 14 volts dc 2666 rpm 66 pounds type cdo-21647 serial 95404
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  #8  
Old 03-07-2014, 10:32:12 AM
cobra123 cobra123 is offline
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Default Re: type cdo 21647 onan generator

nice pics!looks just like mine but everything is there,i think. thanks john
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  #9  
Old 03-07-2014, 10:04:38 PM
Ed Stoller Ed Stoller is offline
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Default Re: type cdo 21647 onan generator

It looks a lot like the Onan OTC 16b, 33 or my 48e, but a later model. Mine is 1944 and your carb is different. I posted reciently a pdf on my ignition replacement and a link to the manual for the OTC 16b. I have mine running , but it is a 6 Volt battery charger. I am to receive the manual for mine tomorrow. Look under Onan too.

Last edited by Ed Stoller; 03-07-2014 at 10:06:15 PM. Reason: Add
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  #10  
Old 09-30-2014, 05:41:43 PM
ti-jean ti-jean is offline
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Default Re: type cdo 21647 onan generator

Hi all today a se a CDO-18010-A SERIAL # 182428 4 H.P./4 CYCLE/2 CYLINDER/ 2,666 R.P.M. but the generator was not on and no case for it the ask 80 $ the Wheel turn so not jam engin

i would like to restore the engine onan still have part for those king of egine ???

thanks
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  #11  
Old 02-01-2015, 06:55:34 PM
gnucklehead gnucklehead is offline
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Default Re: type cdo 21647 onan generator

I am the proud new owner of one of these - the CDO-21647 is the US Navy designation for the AC/DC generator head. It is paired with a CDO-18010-A Onan ("OTC") engine. The type designation of the whole genset is CDO-73004-B. It's a runner, and just has to be the coolest 4HP engine EVER Albeit 2666RPM and 800Hz

The Navy manual for this specific unit is "Instruction Book for Gasoline Engine - Generator Set. Type - CDO - 73004-B / Navships 900, 262". Does anyone happen to have this? East Carolina U has a hardcopy in their library, and I'll arrange a photocopy or borrow the original (interlibrary loan), if no one has it.

Does anyone have a schematic in better shape? It's hiding under the lid of the transport case (attached).
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  #12  
Old 02-01-2015, 07:10:54 PM
gnucklehead gnucklehead is offline
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Default Re: type cdo 21647 onan generator

This relates to a motor-generator, but illustrates why 800Hz didn't last long.
http://aafradio.org/docs/800-1_cap.html
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  #13  
Old 05-31-2015, 08:28:53 PM
gnucklehead gnucklehead is offline
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Default Re: type cdo 21647 onan generator

Wiring diagram, from inside the transport case of a CDO-73004-A generator Yellowlister's genset in post #7
This is a 36-pole generator head @ 2666RPM = 799.8 Hz
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  #14  
Old 03-18-2017, 10:51:03 PM
plastruck plastruck is offline
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Default Re: type cdo 21647 onan generator

I have one of these generater with the whole kit of replacement parts in the lid, everything you need to overhaul the unit including new valves, spark plugs gaskets, everything. I would like to either sell it or donate it to a museum. If you know of someone looking for one please post back to me and we will work out the details.
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