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-   -   8kw onan antifreeze leak (https://www.wanderlodgeownersgroup.com/forums/showthread.php?t=33654)

kg4rrx 04-13-2019 10:18 AM

8kw onan antifreeze leak
On the way out here to BATB I noticed a antifreeze puddle under the generator. Looks like its coming from the backside that you can't see without dropping the whole thing. Any idea what I should be looking for after I get it out?

kunzelj 04-13-2019 10:53 AM

How old are the radiator hoses?

shaaksma 04-13-2019 11:13 AM

The coolant hose runs from the the rear of the compartment to the front of the compartment behind the generator before passing through the wall to the radiator. It is possible to replace without dropping the generator.

kg4rrx 04-13-2019 11:27 AM


Originally Posted by kunzelj (Post 448481)
How old are the radiator hoses?

Probably original.

giderich 04-13-2019 11:45 AM

Chris, if you decide to drop the generator, I suggest you allocate enough time to also change and/or inspect the bearings in the alternator (dynamo by Denso) and also fix any potential exhaust leaks also.

Just trying to save you from pulling the generator again any time soon.

A motorcycle lift works well for removal or use the high lift on your dad's Kubota. :)


A source for the new alternator is:


nbedinger 04-13-2019 12:32 PM

The back side of the Onan in an 'FC. Is that where hose from radiator exit --> engine block runs?

My '91 front-slide 8K DKD is the same way, leaking where I can't see. I have to top up coolant before daily electricity spree while boondocking. No obvious chronic leak on block. I don't get a leak stain on the ground under the genset.

My plan is to clean the tray up enough that I can surround the engine with paper towels and watch for the direction of the leak according to where the towels get wet first.

Usual suspects: leaking freeze plugs, bad thermostat causing overflow as steam, water pump leak, blown head gasket. And hoses that chafe or age out.

No sign of coolant steam in Kubota exhaust. If its head gasket, it isn't full blown, but could be leaking. No sign of water/oil emulsion on dipstick or in oil at recent oil change.

The radiator hoses are really tough strong stiff stout hose with internal wire. One hose has an indentation and a little chafing where it runs against the coolant filler/head tank. I wrapped that part of the hose with silicone tape to protect it but I need to do the paper towel test there too.

The rad is behind the whole generator, so the hoses run back there. With a flashlight I can see the hose runs, no leaks evident. I'll line the hose runs with paper towels too. The leak has to be somewhere.

:( :confused:

Bill Pape 04-13-2019 12:45 PM

lots of good stuff in the rear, starter, several hoses, alternator, exhaust,
there is a write up in the files, with insulation replacement.
The radiator & fan can also be accessed easier, but can be services at another time.

atckip 04-13-2019 06:09 PM

"A motorcycle lift works well for removal or use the high lift on your dad's Kubota"

Shoot Dick.......I wish that was my...John Deere...I'm retired, Chris has all the good toys now!.:D:D:D

Steelwheels 04-13-2019 06:49 PM

Anyone have a good line on the starter ? Or a part number?

Can you lower the generator without disconnecting all the lines ?

kg4rrx 04-16-2019 10:00 AM


Putting this here for easy retrieval

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