Re: HELP! Onan Generator Problem - SOLVED! Reply #25 – August 29, 2021, 06:58:25 pm Quote from: Chuck & Jeannie – August 29, 2021, 06:38:08 pmThe subject of "oil in the propane lines" has come up here in the past. Link below to some old discussions if you're interested.Oil Accumulation in Propane SystemThx:) Quote Selected 1 Likes
Re: HELP! Onan Generator Problem - SOLVED! Reply #26 – August 29, 2021, 10:30:00 pm Last time this happened to me was about 6 months ago. I had to replace the stainless steel line on top of the exhaust manifold caused by the oil drying in the line and stopping it up. I tried all kinds of ways and things to unstop it. None worked. The new line was $150.00. I have not had any problems with the flexiable hose coming from the tank.Pat, Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #27 – October 10, 2021, 07:39:19 pm OK, I finally got time to rebuild the Onan Propane Regulator,I'm rebuilding per the kit from IMPCO.First, the kit has NO springs so I'm reusing the old ones.Definitely plugged up with the goo from the bottom of the tank. Will be getting the tank cleaned if I can and changing the Generator to run off the High pressure vapor side of the tank.One thing seems odd. the NEW regulator I purchased seems identical to the part#184-0964 I pulled off the genny EXCEPT for the input line to the regulator(#8) from the Shutoff valve (#15) on the drawing attached. This input line has a smaller sized 90° screw to flare fitting and I did not notice until I took off the fitting that the port seems to be a water (cooling or heating) tube thru the regulator with, AFAICT, NO port inside for the liquid(gas) propane to get into the reg and thru to the output port at #9 that goes to the input to the carb. The NEW regulator is open from the #8 input to the opposite side and you can see thru it. The OLD reg has this tube blocked, but I cannot see where the propane would go into the main body of the reg and thus to the output of the reg.Seems odd, but I am rebuilding it to was. Perhaps whatever port there is is plugged as I could pressurize either end of the blocked "water tube" in the OLD or by manually blocking the tube on the new reg and sense no leak. I may call IMPCO tomorrow.IAC here are some pics. Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #28 – October 10, 2021, 07:58:34 pm Quote from: Cpt_kludge – October 10, 2021, 07:39:19 pm Will be getting the tank cleaned if I can and changing the Generator to run off the High pressure vapor side of the tank.No need to clean the tank if you switch to high pressure vapor. Those longer hydrocarbon chain "contaminants" will not vaporize, so will not get into the regulator. Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #29 – October 10, 2021, 09:34:28 pm thanks Brett:) Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #30 – October 11, 2021, 08:33:23 am FWIW if you use liquid propane fast enough you need to provide engine heat to vaporize the propane. Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #31 – October 11, 2021, 10:30:44 am The pic shows the delivery tube wrapped around the exhaust for heat . Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #32 – October 11, 2021, 04:41:25 pm It does indeed!As the expansion rate of LPG is 270then there should be a SMALL hole that allows the LP (or G) into the body of the regulator.I want to make sure that THAT hole is clear before I reassemble the reg. OK, called Impco, no real help there, but Intella helped a lot. It looks like the casting for the model J Regulators that we use has a connection to the input port that later casting don't have. Later castings use that port as a water flow to cool or heat the regulator. The NEW reg I purchased is like this, other that that it looks identical. It seems like a new reg could be used but change the input to the side LPG IN port that is plugged on the earlier Model J's. There is still an issue of the correct spring for Onan use, but I'm talking to Intella about that. Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #33 – October 11, 2021, 05:01:28 pm Quote from: Protech Racing – October 11, 2021, 10:30:44 amThe pic shows the delivery tube wrapped around the exhaust for heat . Thanks. Now I see it. I was wondering what was the loop's purpose. I was stuck on engine coolant being used to heat the liquid propane. You know, the technology with which I'm familiar. Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #34 – October 11, 2021, 05:11:50 pm Yes, "feeding" the on-generator propane regulator with liquid LP does require some heating or the regulator could freeze up.Switching to high pressure vapor should eliminate that issue unless extremely cold conditions. At least, once I converted ours to vapor, never hand an issue of any kind.Can't help with "new" vs OE, as all I did was overhaul the OE regulator using the high temp kit. Quote Selected 1 Likes
Re: HELP! Onan Generator Problem - SOLVED! Reply #35 – October 11, 2021, 06:10:14 pm Quote from: wolfe10 – October 11, 2021, 05:11:50 pmYes, "feeding" the on-generator propane regulator with liquid LP does require some heating or the regulator could freeze up.Switching to high pressure vapor should eliminate that issue unless extremely cold conditions. At least, once I converted ours to vapor, never hand an issue of any kind.Can't help with "new" vs OE, as all I did was overhaul the OE regulator using the high temp kit.Ya, I'm trying to see if Intella can provide an off the shelf reg that would replace the original with no changes. The rebuild kit seems fine, but NO replacement springs. Just reusing the originals:) Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #36 – June 30, 2025, 10:41:28 am Hi all,I realize this post is a few years old but it addresses a concern I am also having with my 1995 Onan Marquis 6500.Mine also has the exhaust heated tube.My problem is also similar to a previous poster in that the generator will run but when a large load (a/c) is applied the gen will stumble and shut down.Although I think (pretty sure) the a/c has issues of it's own, the a/c will run on utility (50a shore power) but doesn't seem to be quite right.I have dropped the generator, while still keeping the connections, to be able to make repairs and test on the coach.I have already dropped and cleaned the filter where the liquid line comes in. There was some dust/debris/crumbs in the bottom of the bowl, but the "stone" filter appeared good. I cleaned and blew out the filter with brake clean and re installed it.There appears to be some "goo" leaking around the lp regulator test(?) plug.I would post pics, but not sure how to do this yet.Any thoughts?Thanks for having me,Bruce Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #37 – June 30, 2025, 10:58:36 am Bruce,Welcome to the ForeForum.There are overhaul kits for the propane regulator. Be sure to order the high temp (silicone) ones, since it is in a high-heat location.And, yes, as many of us have done, at the propane tank change the line that supplies the generator from liquid LP to high pressure vapor (T in between vapor port on the tank and the house propane regulator). The long hydrocarbon chain contaminants that clog the on-generator do not "evaporate" and get into the vapor port nearly as easily as in the liquid port. Quote Selected 2 Likes
Re: HELP! Onan Generator Problem - SOLVED! Reply #38 – June 30, 2025, 11:55:20 am Quote from: wolfe10 – June 30, 2025, 10:58:36 amThere are overhaul kits for the propane regulator. Be sure to order the high temp (silicone) ones, since it is in a high-heat location.Thank you for replying.Do you have a preferred source, for these kits?I can search the internet, but really like to rely of the success of others to guide me.A link or part number would be perfect. Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #39 – June 30, 2025, 12:02:40 pm Quote from: Bruce F – June 30, 2025, 11:55:20 amThank you for replying.Do you have a preferred source, for these kits?I can search the internet, but really like to rely of the success of others to guide me.A link or part number would be perfect.You will need to verify, as this information is 20 years old (good grief does time fly):Impco RKJ-2 kit 201017 kit w silicone diaphragm $47. Model J-2 regulator includes silicone diaphragm. Quote Selected 1 Likes
Re: HELP! Onan Generator Problem - SOLVED! Reply #40 – June 30, 2025, 01:43:09 pm I found these links pretty easily:Impco RK-J-2 Pressure Regulator Repair Kit - IMS SupplyIMPCO REPAIR REBUILD KIT MODEL RK-J-2 REGULATOR VAPORIZER SILICONE DIA –...They seem to be correct(?)Do you concur? Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #41 – June 30, 2025, 02:01:27 pm Sorry to be a bother.The one place was out of stock, the other was a week behind in shipping and only showed one.This place says they have over 200 of these kits.RK-J-2-IMP IMPCO Propane Repair Kit for Model J, Silicone Diaphragm -...The number is slightly different.Do you think it is a suitable fit? Or is the rest of the number (RKJ-2 kit 201017 ) important? Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #42 – June 30, 2025, 02:52:25 pm Sorry, I know nothing about the quality of Helmar parts. If you can't find the Impco parts, may be worth exploring.I would call your local Propane Dealer (the real dealer, not a station that sells propane). That is who ordered one for me. They likely have a completely different list of wholesalers they deal with.Also, contact Imco and ask where you can get the proper Impco part. Quote Selected 2 Likes
Re: HELP! Onan Generator Problem - SOLVED! Reply #43 – June 30, 2025, 06:55:57 pm I rolled the dice and ordered the kit I linked that had it. I pulled the old reg and dumped a nice puddle of oil in my crotch without realizing it. After I crawled out I dumped some more on the floor, then I dumped at least another teaspoonful into a pan (less in the pan than on me and the floor, as is the usual case🤣).Kinda considering reinstalling to see if the several teaspoons is what was causing my low gen engine power. Reg being "sluggish" perhaps?? Quote Selected
Re: HELP! Onan Generator Problem - SOLVED! Reply #44 – July 01, 2025, 07:34:17 pm Well, since I am waiting for the lp reg rebuild kit and had some time, I decided to take apart the valve and see how bad it was.It was bad!I cleaned it out with brake clean, wiped off the diaphragms with paper towel, gently blew it dry, assembled, installed, and tested.Generator runs much smoother and will take the a/c load without stalling.However, the a/c is not right yet. While running on shore I hear a compressor come on and turn off pretty quickly. While on generator the generator will bog (load down) pretty hard but not stall as before.I call this a partial win.I've ordered capacitors for the a/c compressors and they should be in soon.I did try switching the caps between the two compressors but the problem still persists.I may have a bad compressor.I can get by on one for now if I have to. I'll just have to figure out the wiring, in order to switch which one runs on 30amp service (comp1 I believe).Everything on a coach is built around everything else, as you all know.My next "upgrade" will be to install the Victron Quatro II with a display I purchased.Thanks for the help!Bruce F Quote Selected 2 Likes
Topic: HELP! Onan Generator Problem - SOLVED!