Community Forums

okiebug13 · 08-06-2018, 04:38 PM

I tried to change the oil at the 50 hour mark. I had all the parts and oil ready to
go. Then I could not get the drain plug out, it just would not break loose. So
to took it to Rv repair shop and ask them to change it. Just got a call it will
be about 700 dollars. They have to take the generator out to get a better grip
on the plug to break it loose maybe will know tomorrow. Anyone else ever have
a problem like this. They tell me that they are put in at the factory at a 180 lbs. for 10mil plug. They also said that its a common problem and Onan will not
warranty it. Thanks

Mac99 · 08-06-2018, 04:45 PM

I've changed my oil in the same unit you have annually
over the last 8 years with never a problem with the
drain plug. I'd suggest some liquid wrench and an
impact drill to break it free. You must be in a very
corrosive environment.

Dsallach · 08-06-2018, 04:51 PM

That should be a square head 3/8head plug. I took a 3/8 extension reversed it and put the square end on the head of the plug then got and old 3/8” 8 point socket and put it on the extension with a breaker bar and 4’ of pipe on the breaker bar. It came off.

Dsallach · 08-06-2018, 04:54 PM

Rather than $700 you could do what they do on boats. They make an oil extraction unit where you suck the oil out of the dipstick tube. It does not get every last drop but, it gets 95%. You just change the oil a little earlier.

Dsallach · 08-06-2018, 04:56 PM

Here is a link to a marine oil extractor
https://www.wholesalemarine.com/trac...iABEgKfQPD_BwE

Dsallach · 08-06-2018, 04:59 PM

Actually this is the one I use to use on the boat
https://www.lowes.com/pd/Hopkins-Oil...SABEgIFmPD_BwE

bobmac · 08-06-2018, 05:03 PM

I replaced the oil plug with a Fumoto valve. Just have to put a gallon jug underneath and stick the tube into it and open the valve. Oil and filter is a 15 minute DIY job. Get rid of the plug unless you do your own changes as shops are inclined to over torque the plug making removal difficult or impossible.

Tha_Rooster · 08-06-2018, 05:22 PM

Unless they stripped it out put a bigger breaker bar on it. I don’t see any reason to take the genny out I’ve never had any trouble with my 7500.

RVBoomer · 08-06-2018, 05:23 PM

We recently changed the oil and filter on our RV QD 8K Generator and had the same problem of getting the oil drain plug free especially laying on my back. At first I was attempting to do so using a standard 3/8 socket ratchet but it wouldn't give.

So I broke out the breaker bar which did job. Many others have mentioned that the Onan Generator oil drain plug is difficult to get loose which I can now attest to.

Very interesting to hear that your the RV repair shop had to actually remove the generator for them to get the oil drain plug free.

OverDo · 08-06-2018, 07:17 PM

It's an 1/8" NPT (tapered pipe thread) plug that is easy to get too tight. Mine was very hard to get out the first time. I replaced it with a hex headed version and be careful not to over tighten since then. There should be no need to remove the generator. You may have to weld a nut or similar to the drain plug if they stripped the square head on it. I dont know why Onan doesn't use a straight threaded plug with a gasket.

lslblues · 08-06-2018, 07:35 PM

Mine was unbelievably tight but was able to get it loose. Oil filter was way over tight as well.

Finance · 08-06-2018, 07:51 PM

If it's still in warranty take it to Onan. The shop is probably hosing you.

Cudntherd · 08-06-2018, 09:01 PM

okiebug13
If you do not get your situation resolved. I recommend you take your RV to Cantwell Power Solutions in Fort Worth.
I had them work on my QD 7500. Great Service at a reasonable price.