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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

What Have You Done to Your Onan Generator Today?


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  #1521  
Old 03-05-2015, 05:41:32 PM
len k len k is offline
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Default Re: What have you done to your Onan generator today?

I like uniform pressure so don't ding the piston tops, I'ld watch pressure though, think you can easily go over 500 psi. I had a real tight idler arm on GF's car, when under car I had to press up at car to hold me on ground when I was pushing lever down to grease it. And I'm ~220. That got me wondering so I calculated it out and found a grease gun can make ~ 6,000+ psi .Maybe put a pressure gauge on grease gun. I think you can easily get to 500 psi without too much force at all. I do like the idea of the oil/grease getting thru the rings though. If you look at grease fitting you realize it is high pressure as all that grease easily flows quickly thru that tiny hole.

Never tried it on multi-cylinder without removing crank and rod, would worry they could break.

Last edited by len k; 03-05-2015 at 06:01:25 PM.
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  #1522  
Old 03-06-2015, 10:10:40 PM
yellowlister yellowlister is offline
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Default Re: What have you done to your Onan generator today?

Stripped the jc down to the bare block.. well the easy stuff at least.. flipped it over with the help of my engine hoist.. removed pan.. looks super clean inside.. the drained oil was very clean as well.. time to dump so more aft in the cylinders upside down and let it soak for a few weeks.. if I can wait that long..

Looks like there is some rust on the cam gear.. I dident try to hard.. but I could not remove the distributor from the block.. its all corroded and may need to be replaced..
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  #1523  
Old 03-06-2015, 10:46:18 PM
ckelp ckelp is offline
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Default Re: What have you done to your Onan generator today?

with the engine upside down fill it full of diesel and a quart or two of atf
then go brew 5 gal of beer.. and when the beer is done so will be the engine..
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  #1524  
Old 03-06-2015, 10:55:16 PM
yellowlister yellowlister is offline
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Default Re: What have you done to your Onan generator today?

I was going to do something like that.. I started filling the cylinders with aft.. and within a few min there was a big puddle under the cart on cylinder 1 and two.. now ive got a big damn mess to clean up..
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  #1525  
Old 03-06-2015, 11:06:35 PM
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Default Re: What have you done to your Onan generator today?

Why not pop the rod caps off and use a piece of wood with hammer from the bottom, to push the pistons out, one-at-a-time?
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  #1526  
Old 03-06-2015, 11:28:24 PM
ckelp ckelp is offline
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Default Re: What have you done to your Onan generator today?

how about #3 and 4? it maybe just one is stuck..
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  #1527  
Old 03-08-2015, 04:28:57 PM
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Default Re: What have you done to your Onan generator today?

Got the CCKB 10.0 wired up each leg has its own 120 vac plug outlet so now if I need it I can run house hold appliances .
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  #1528  
Old 03-08-2015, 05:34:47 PM
Leon N. Leon N. is offline
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Default Re: What have you done to your Onan generator today?

If you are seeing ATF getting by the rings, then I would think you may find more damage or excessive wear in the cylinders. Maybe the ATF is passing by the two compression ring gaps and the oil control ring gap OR it may be that the rings are not seated or broken.

Also, if you decide to remove ANY journal, make sure you keep a record of the exact pieces, cap, insert and insert positions so that you can re assemble in the exact same way that they were originally installed. Also, you must follow the Onan torque requirements when reassembling.

If it was me and I could get to each rod journal cap, I would remove all journal caps and the lower half of the inserts and lift the crankshaft out. Then I would gingerly push or attempt to force each piston DOWN, not up in there respective cylinders. Reason being there probably is less rust on the lower end of each cylinder.

The pistons being aluminum, you have to be careful and you could damage them if you are not very carful in applying pressure to the top of the pistons.

Well, after all, what have you got to loose? Good luck.
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  #1529  
Old 03-08-2015, 06:31:39 PM
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Default Re: What have you done to your Onan generator today?

Quote:
Originally Posted by Leon N. View Post
...
If it was me and I could get to each rod journal cap, I would remove all journal caps and the lower half of the inserts and lift the crankshaft out. Then I would gingerly push or attempt to force each piston DOWN, not up in there respective cylinders. Reason being there probably is less rust on the lower end of each cylinder. ...
Good idea...
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  #1530  
Old 03-12-2015, 04:57:27 PM
yellowlister yellowlister is offline
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Default Re: What have you done to your Onan generator today?

I ran my favorite onan today.. my 5.0 cck contractor series pull start only.. haven't started it in 2 months or so.. fired on the 5th pull.. I forgot what a bear this old gal is to pull start. Ran it for about an hour with a 2500 watt load.. maybe 15 amps.. got the oil nice and hot.. and a cool down run time of 15 min with a 500 watt load. Love the ccks..

Figured id run my 4.0 cck rv gen,, just a little 20 min run with a 2000 watt load. Dident skip a beat.
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Last edited by yellowlister; 03-12-2015 at 05:44:37 PM.
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