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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan 4.0CCK round style generator head


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  #11  
Old 12-13-2015, 12:54:07 AM
turtmaster turtmaster is offline
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Default Re: onan 4.0cck round style generator head

does anyone have the installation (like compartment ventilation hole sizes and ect ) and engine manual for this cck or my other cck(4.0 cck un style head)
since I want to make a little hut for this on, with mini stud walls with open faced rockwool insulation held in with hardware cloth or chicken wire, for sound abatement, the other cck also, just on a little cart / trailer.

and I don't want to cook the gens with out enough ventilation, also what do you guys use for oil (I know I'm opening of a can of those invasive "crazy jumping worms asking opinions on oil)


synthetic or dino, weight for temperature, ect. I was planning on getting another frantz oil filter to put on it ( the tp filter on my cck after installing it I poured the old oil I drained out of it back in to the gen after straining it and the toilet paper filter noticeably lightened the color of the oil after a few hours of running it, afterwards I changed the oil in it.)
and after a few short interval oil changes for cleaning it out a bit, I was planning on running amsoil or mobil1 5W50 or 15W50 for all temps, what do you think?

-Joe
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  #12  
Old 12-13-2015, 01:19:15 AM
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Motorhead Motorhead is offline
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Default Re: onan 4.0cck round style generator head

If it is to be used at a camp only 3-4 weeks out of a year then you would be best to have a portable fuel tank like an outboard motor boat tank. This way you can always bring fresh gasoline to the set and the boat tank has a primer bulb so you can prime the carburetor. Also, make sure when you are DONE using the generator for the season that you let the engine run with the fuel shut off so the carburetor runs DRY. I would bet that the fuel pump is just gummed up with old fuel. I think that the gravity feed would be your best bet.
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Old 12-13-2015, 07:00:45 AM
Kevin K Kevin K is offline
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Default Re: onan 4.0cck round style generator head

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Originally Posted by turtmaster View Post
does anyone have the installation (like compartment ventilation hole sizes and ect ) and engine manual for this cck or my other cck(4.0 cck un style head)
Stop by Doug's site and download some manuals:

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

927-0006 CCK Spec A-F Instruction Manual
927-0120 Operator
927-0122 Operator
927-0220 Parts
927-0222 Parts
927-0300 Owners & Parts
927-0310 Owners & Parts
927-0360 Standby Owners & Parts
927-0500 Service
927-0754 Engine Service
900-0196 UN generator Service (square head CCK's Spec R-V)

Reading through that list will occupy some of your spare time for a while.
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Old 12-13-2015, 03:22:17 PM
len k len k is offline
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Default Re: onan 4.0cck round style generator head

I still got my gen running off a small 1/2 gal gas tank for testing. So it's easy to add a splash of stabilizer at end and let gen run out of gas.

If you don't want to treat all your gas, can add a 3-way valve at main tank and can have 2 tanks. One main tank and a separate small one to run gas & stabilizer thru lines and let carb run out of gas.
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Old 12-15-2015, 12:34:38 AM
turtmaster turtmaster is offline
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Default Re: onan 4.0cck round style generator head

my dad and I are going to go look at it this weekend and the guy reposted his add and lowered his price to 125
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  #16  
Old 12-15-2015, 01:32:18 AM
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Default Re: onan 4.0cck round style generator head

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my dad and I are going to go look at it this weekend and the guy reposted his add and lowered his price to 125
That means to me that you could wave FOUR, 20 dollar bills in his face and take it home. Can't go too wrong at that price.
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Old 12-15-2015, 02:03:54 AM
turtmaster turtmaster is offline
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Default Re: onan 4.0cck round style generator head

fyi a 4.0 cck with low compression heads can be cranked and started on 2, 8ft 8 awg for 16ft total I think it was 8 ft pieces or possibly 6 ft pieces, for battery cables but the key is good tight crimped and soldered connections
but it cranks a little slow
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Old 12-15-2015, 03:52:40 AM
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Default Re: onan 4.0cck round style generator head

16 ft of 8 gauge is .01 ohm. At 300 amps that's 3 V drop in just the wire. And I suspect they draw more amps than that.
I think Onan specs out a fatter wire.
If they crank too slow you can burn a commutator.
These are exciter cranked engines , and they suck a lot of amps.......the saying goes you need a Big Fooking Battery.
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Old 12-15-2015, 01:10:12 PM
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Default Re: onan 4.0cck round style generator head

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Originally Posted by len k View Post
16 ft of 8 gauge is .01 ohm. At 300 amps that's 3 V drop in just the wire. And I suspect they draw more amps than that.
I think Onan specs out a fatter wire.
If they crank too slow you can burn a commutator.
These are exciter cranked engines , and they suck a lot of amps.......the saying goes you need a Big Fooking Battery.
The 1958 5cck I own that is in a factory enclosure, has a battery rack that is supposed to fit the narrow but LONG battery that is used to start a 1950's BUICK V8! 850 CCA http://www.antiqueautobattery.com/ba...3ED-Delco.html
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Old 12-15-2015, 02:11:14 PM
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Default Re: onan 4.0cck round style generator head

THREE HUNDRED AMPS?!? To crank a little tiny engine?? I've heard that these Onan's somehow have inefficient cranking motors but that's crazy!

My exciter cranked 6-1/2 kW Kohler LEAPS to life just using a crappy, small gauge *booster* cable off of the ordinary battery in my car! It just makes a little spark when connected.....

Cranking slowly won't hurt anything. It's when the cranking stops completely for too long that's a problem. The amps are less (otherwise it wouldn't stop cranking) but sitting in one place would burn the commutator. Eventually. Battery would probably go dead first though. We called that phenomenon "stall burn" on the railroad..... Caused by using the engine to hold a train on a grade.

Keith
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