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Onan Generators

Onan 6.5 NH-3CR J, picked up free out of a yard. Nothing's ever free...


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  #21  
Old 08-20-2018, 10:31:43 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

I want your recipe for the 3rd. carb. picture!!!!
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Old 08-20-2018, 10:47:06 PM
Vanman Vanman is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

Whoa. I'm having a difficult time wrapping my mind around that actually being the same carb!!!

Not having an electronic AVR is a prerequisite for me when buying generators. Seems like 9 times out of 10, when someone posts about their dead generator, it's a failed voltage regulator. Perhaps I have exaggerated, but it seems like a lot. And, as I like to say "You can't have an AVR failure if you don't have an AVR".
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Old 08-20-2018, 10:52:49 PM
RB855 RB855 is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

It's a nasty one, but it sure does work. Start out with Sodium Hydroxide. Basically Lye, liquid draino and so on. Get ya some good gloves and an old tooth brush, ya won't want it when your done. Pour it on straight, brush it down, ya gotta be done in less than a minute. Will take the rust right off the steel bits too. Hose it down really well. NaOH will make aluminum porus and will soak in. Wash it, then wash it some more.

Now go grab some Hydrochloric Acid. Good ole gel acid toilet cleaner works a treat. Pour it on while the parts are wet and give it a good scrub. This will counter the NaOH that may have soaked in and take some of the black oxide off. Also makes the brass bits shiny. You have a little more time to work here but try to keep it under 2-3 minutes. Wash it till you think your done, then do it again. Rubbing it with your fingers will take the loose black oxides off and leave a dark grey finish. Rinse and dry.

Buff parts gently with wire brush. If you did this right it will take effectively everything off. Grease, rust, aluminum oxide, some paints, gasoline gunk, the works. Just be very careful, it can make aluminum brittle so never use it on stressed members.
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Old 08-20-2018, 10:53:50 PM
AngolaGravely AngolaGravely is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

For the carb, I'm assuming about 45 minutes in a 90*C solution of dishsoap and water with a 60Khz bath in about 100 watts of power.

Ultrasonic. the only way to clean carbs.
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Old 08-20-2018, 10:57:10 PM
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

The picture down the throat is why I didn't want to try reviving this carb...

The second pic is a deviation from my directions. I gave it a hydrochloric bath first to free up the mix screws and float retainer screw. That is what it looked like before hitting it with the NaOH.
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Old 08-21-2018, 09:53:41 AM
grif grif is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

Seems like the model airplane folks use plain old antifreeze in a crock pot over night to clean up aluminum engine parts?
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Old 08-21-2018, 10:15:38 AM
RB855 RB855 is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

That would work on lightly oxidized parts due to the antiox/deox in the antifreeze. This poor carb was pretty exceptional. There are gentler ways of doing this of course, but I really wanted to burn out the passages and so on (impatience). So far it looks like it will serve again. Just need to get my gaskets and slap it back together, see if I can get some action.
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Old 08-21-2018, 09:23:57 PM
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

Welp. Left the diesel sitting for 24hr, and I hate to say I'm a bit disappointed in the results. Came out as clean as it went in, and left the sludge where it sat. Ended up sloshing about half a gallon of old gasoline and flushed almost all of it out. The sump looks pretty good now. Poured about 1qt of oil down the breather and valve boxes and left to drain. Hurry up gaskets . . .
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Old 08-25-2018, 09:21:02 AM
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

Envelope of gaskets showed up last night finally. Got the spark-plug insert set. Carb is reassembled. Cant find a close match for the paint anywhere... Got a few other odds and ends. This thing better sound good when it goes! lol
Also couldn't help myself with the intake and cleaned up some of the casting burrs. Not like its going to gain anything seeing the size of the port vs the carb diameter. Need to dig through my box of old ignition parts, see if I can find a good temporary condenser, put it all back together and see what happens.

Of course, I have 2 sisters who's both throwing their bday today that I've been mandated to attend. Why do events always happen when you have something to do?

Also acquired a great resistive load from work to test this thing out with, along with some of the fixings for wiring it up. If its not by tonight, it'll be tomorrow.

Thanks for following along!
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Old 08-25-2018, 09:53:25 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 6.5 NH-3CR J , picked up free out of a yard. Nothing's ever free...

Nothing happens until you get busy

I spent 3 years at Mayport. I guess not much has changed.
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