Change the Coolant in Your Onan Diesel RV Generator || RV Generator Maintenance
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- เผยแพร่เมื่อ 20 ก.ค. 2024
- Onan Quiet Diesel RV Generator Service / Maintenance - flush the cooling system and replace the anti-freeze. RV Generator maintenance you can do yourself! We show you how we flushed & replaced the coolant in our RV Onan 7.5kW Quiet Diesel Generator.
Our Onan RV generator oil & filter change, spark arrestor cleaning and air filter replacement video is here:
• ONAN RV GENERATOR MAIN...
Watch our Onan RV generator fuel filter replacement video here:
• Onan RV Generator Fuel...
As a follow-up to our recent video on generator maintenance, when we cleaned the spark arrestor and changed the oil, oil filter & air filter, today we're servicing the cooling system.
We flush the cooling system and replace the anti-freeze and radiator pressure cap on our Onan 7.5 kilowatt Quiet Diesel RV generator every two years. Every other time (every four years) we also replace the thermostat. Unfortunately, the thermostat can only be replaced if you have access to the top of the RV generator's engine, so the generator must be on a slide-out to do it yourself. The rest of the job can be done without a generator slide.
We use regular automotive radiator flush, anti-freeze and replacement pressure cap, all of which can be purchased at most auto parts stores. We purchased the new thermostat and gasket directly from Onan. We also chose to use pure antifreeze and mix it 50/50 with de-ionized or distilled water, as opposed to buying the 50/50 pre-mixed coolant. It doesn't matter which you choose. Regular tap water can be used if it is low in minerals, but for such an important application, we don't mind spending an extra dollar or two on bottled water (although we do the flushing and rinsing of the system with regular tap water).
The two most common challenges with this task are getting all of the coolant drained out of the system, and then getting all of the air back out of it. Onan published a service bulletin to address this, in which they recommend using care when filling the system, by avoiding pouring water, flush or coolant into the vent or overflow tubes. While the whole process is a bit time-consuming, the method we demonstrate has been very successful for us, and we've never had a problem getting our genset back up and running without incident.
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You really do a very nice job on these videos, I can wait for the next ones!!!!!
Gentlemen, an excellent, thorough, detailed video. Your procedures on this video could apply to many other small engines. Thanks again!!
Thanks Rob! Good to know. :)
As usual great video guys and thank you for looking after all your RV brothers and sisters!
Thanks! I've replaced the fuel filter before, and will make a video about it the next time it's due. Sorry though... I think I'm not scheduled for that until next year. As I recall, it wasn't hard at all. Have a catch basin (an oil pan is perfect) and wear nitrile gloves. If I remember right, you also need a vise grips or two to pinch off the fuel line(s). I'll see if I can find some instructions and send them to you.
That's a great question Pat. Since generators are powered by an internal combustion engine (either diesel of gas), they all have to have to be cooled, but smaller ones may be air cooled instead of water cooled.
Great video. Your example is the same generator as I have in my Dutchstar. Now I know where the filler tube is. Again, great instructional video.
I've seen three about the Onan QD 7500, well done tutorial, Namaste...
One of the best How to video I ever watched. Great job and I know what I'll be doing next. Thank you
Excellent video. Now I understand how to do it correctly! Thanks!
you make it look so easy! another great video
Wow... I am going to follow you guys around and be a scrap collector!! Your beautiful tires, a working thermostat, green coolant.......my Toyota Tacoma has 206,000 miles on the original coolant!!! Its bright red still so in da radiator it stays!!!! Great video!! In fact when you and travel pal sell that coach I will buy it. Even the Onan cover is beautiful, evidence of the care you provide for Newman the Newmar.
We sure do try hard to take great care of our home on wheels. 😊
Another great informative video, thanks!
great video's, being a new person to RV's It is really great to watch these.
Thanks! Glad you found this useful. :)
Very good video. You are a natural at this stuff.
Nice video, very informative. I like the end of the video "the crowd as wild" sound bit that was funny.
Jorge 👋
One of the most professional vids on tube university! thanks!! I appreciate the time you put into this. Saved me a lot of time! >Running an 8K for Audio Visual Trailer-ATL Metro, GA.
Great Channel content, keep it up RVgeeks!
Excellant video, very professional, couldn't be better!
Ron
Nicely done. Very thorough and very well explained!
Your retired ?
+Ed & JoAnn Hass. I have the same trouble you do.... seeing the green coolant through the white translucent bottle. Here's my trick. I lean into the front of the RV once or twice while looking at the bottle. This shakes the entire RV just enough to make a little "wave" of coolant inside the bottle. Our RV is 43' and I'm 180 lbs, but it's easy enough to make the RV move just a tad and make the coolant move a little for a few seconds, allowing me to see the level. This is the way I've always done it, so maybe that will work for you too!
Greetings from Toronto, great videos.
You should definitely ask about it. Some shops are very proactive about recommending things, and others only do what you tell them.
I love your videos! You guys do such a thorough job and I so appreciate it!
I’m so grateful! We live full-time so it’s important we know how to do this stuff. 🙏🏻💕🌻
I’m currently in Arkansas and unable to locate any location I can bring the used coolant. Even the mechanics in the area won’t take anyone else’s used coolant. The auto parts stores only take oil here.
Called the local government and they had no suggestions either. Hmmm 🤔
Could wait till I get back to Arizona or store the used coolant on board until I can find a place.
Thanks so much for the comment! Sorry to hear that you’re having trouble finding a place to recycle the coolant. We never cease to be amazed by the incredible variety of laws and processes for something you think would be pretty standardized.
excellent video with valuable points!
Thanks Mike! :)
I enjoyed your vedio. It was very informative. Thank you!
I have never heard my genset go into low idle or increase speed with or without a load. I've always thought that the engine runs at a constant speed of about 1800 rpm in order to generate 60 cycle power. I'll have to listen more closely when I do my service on it. Thanks for the video.
Another fine and accurate video.
Hey 👋
This is incredibly informative and I thank you so much for this. I do wish you had included parts numbers. I went to my local NAPA and they don't have a reference for the thermostat and gasket.
Sorry about that Dave. Here's where we buy our Onan parts: www.rvchassisparts.com
Oops. Sorry. Just remembered that we get all our other Onan parts there (air, oil & fuel filters, etc.), but the thermostat is a standard type that we pick up in an auto parts store. Were they able to match it for you?
Good video... My generator is in my semi truck. I bought it about a month ago and been trying to get years of neglected maintenance caught up.
Hi 😊
Fantastic instructional video!
Thanks!
Thanx for answer....Simple for you :) difficult for a non mechanic
Very good video, thanks.
Honestly, one of the very best DIY series for RV owners. The only thing that might make it better is to show the people who actually make the series rather than just narrate it.
Thanks for the comment, Gary. I actually do both the work and narration myself, but just don't show my face on camera very much! lol
Excellent tips, as always. : )
Hi 👋
Your videos are all very helpful, Thanks. Although where do you buy all ur replacement parts?
Thanks, Zev! Glad you like 'em! If you're talking specifically about the parts for performing maintenance on our Onan generator... we often order them from either rvchassisparts.com or on Amazon... just depends on what we need, where we are when we need it, and what's in stock.
We have the same Onan 7500 genset and found this very useful...as are your videos on oil change, fuel filter, etc. One question: is there a particular thermostat that's needed or can it be purchased at an auto parts store?
Hi John! The thermostat we always use is an actual Onan part, and a little expensive, but only needs replacing every 5 years, so not too bad over time. Here's the part you need: getrvparts.com/onan-cummins-a046z961-rv-diesel-generator-thermostat-185-5458/ Also, be sure to order a new thermostat gasket at the same time, as they should always be replaced together: getrvparts.com/onan-cummins-185-2238-rv-diesel-generator-thermostat-gasket/ BTW...The pressure cap for the radiator is pretty standard, and is available at most auto parts stores. Hope this helps!
Thanks again. Just serviced my quiet 7.5 gen.
Hi Fred 👋
great video, thanks
Thanks for awesome video. Can you tell me how you get to the air filter? I probably miss that and the spark arrester.
We covered the air filter and spark arrestor in a previous video: th-cam.com/video/CxqkHAAH818/w-d-xo.html
I have never owned or probably ever own that nice of a motor home, but I noticed what looked like a thermastat to turn the roof air condioner on inside the generator compartment. Excuse My lack of knowledge, but do they have a remote for the air conditioner out there?
+Russell Hancock You probably saw the remote temperature sensor we mounted in there. That transmits the outdoor temperature to the indoor/outdoor thermometer inside. It looks kind of like a thermostat. No a/c control out there!
Very nice video. Freightliner uses: "Fleet Charge SCA Pre Charged Coolant Anti-Freeze for Heavy Duty Engines as factory fill" for its engines, including my Cat 3126E. The generator should not use this? Or is it acceptable?
Also, I have only 260 hours on the generator. Onan specs are to replace at 1000 hours; I don't see a age replacement spec. But its a 2003 and probably has never had coolant changed. Is it wise to change anyway?
The specs required for coolant should be in your generator owners manual, but there's generally two types.... pink or green. We're pretty sure if you stick with the color you have, you'll be good. Every generator surely has both a time and hours requirement for coolant replacement. Be sure to check the manual, as 13 years has got to be way too long, regardless of hours. Ours is every 1,000 hours or two years, whichever comes first.
I find that if I drill a small hole in the thermostat just to the inside of the gasket area, you will eliminate most air trapped in the refilling of any engine
Gornall
Thank you for this video you should possible have said that if the generator is diesel they require different antifreeze
Hi Carter! Our Onan Diesel generator owner's manual says only the following about coolant: "Use ethylene or propylene glycol anti-freeze solution that con- tains a rust and corrosion inhibitor. The anti-freeze should not contain a stop-leak additive." There's no special requirement other than that. We opt to use Fleetguard Compleat coolant, since that's what our engine uses. Saves us from having to keep two types of coolant around.
Excellent video. Wish I could find one on replacing the fuel filter.
They have one, oil change, fuel filter and air filter on the Onan 7500.
Try this one, Den: th-cam.com/video/4G8TjuZfyHE/w-d-xo.html
Bought a 98 Country coach Magna a few months ago and although Im happy I did,I get overwhelmed a little with all the things to worry about. I have an Onan 8000 and these videos on servicing are super super helpful. Im gonna change the oil today for the first time. In regards to changing the coolant or even monitoring it, is there anyway to see if you need to? I suspect the answer is just do it for piece of mind.
Congrats on your new-to-you rig, Barry! So glad our videos are helpful. We'd suggest that unless the previous owner stated specifically that the coolant was recently replaced, we'd do the entire process, just to create a baseline where YOU know when it was done. Pro Tip: use OAT long-life coolant, which is better than the older style we used in this old video. This stuff is the best! amzn.to/3wcYvSa Pre-mixed (don't add water) and extended life.
@@RVgeeks Will do, Very kind of you to respond with that advice. Much appreciated.
@@barryjackson1401Hi Barry 👋
never mind. I just found where we had asked this same question once before.
memory is a bad thing to loose :)
Hi Edward 👋
Great video........
Thomas 👋
Great, my issue was I didn't pull the hose out far enough. Wouldn't take any flush found a kink in the hose. Once straighten out all went fine.
Hi Pat 👋
Any idea why I would have coolant spraying out of the vent hose when I have the cap off?
+Trey Palreiro Hi Trey! Is it possible that you got some coolant down the overflow tube while you were filling it? Is this only happening when the generator is running, and does it continue to happen, or just spray out initially when you start the generator?
WHen you added the water why didn't you use the same blue funnel with white extension ~ Just curious ~ is there a reason?
No special reason other than we generally only use the one with the long white extension when a non-flexible one won't work as well (or at all) for a particular job.
7,500 watts. That's an Onan 7.5 Kilowatt Quiet Diesel, one of the most popular generators out there.
Great video. Would suggest testing the thermostat in a pan of boiling water first - you don't want to have to do that job twice if it isn't on a slide out. =)
+TheWizechatmgr Thanks for that great tip!
Thanks for the great video. I'm going to service my Onan 7500 diesel generator, looks exactly like yours, where do you get the thermostat? Are there any brand or type of flush that you recommend? I understand some of these generators have two fuel filters, one post fuel pump and one pre-pump. Any info on this? Thanks again.
+Frank Freitas Hi Frank. We bought our thermostat directly from Cummins Onan when we were in Indiana. We just did a little searching for where to buy it online, but not sure the best place to recommend. We'd suggest contacting Cummins Onan directly to inquire about either buying online or where you can buy one in person. www.cumminsonanstore.com Just have your generator model number handy. Hope this helps.
+RVgeeks Thanks, do. You know the pounds of pressure rating on the cap?, Thanks
@@NipomoBeachhi handsome 👋
Of what you mentioned peter about putting the drain cap back on, I know my grandfathers friend mentioned about a time that someone that my father worked with as a mechanic was changing the oil in I think it was a box truck diesel engine, and the guy drained the engine and forgot to put the drain plug back in the engine, and put the device that fills the engine with oil, and set it for I think it was 44 quarts and walked away. He came back to 44 quarts of oil on the floor under the truck. Yeah, that was a mess. X(
Yikes!
@@RVgeeks Yeah, I know. I know another time, I think It was within a year or 2 or so ago, my father and a few other guys were working on a truck, and one guy went to start the engine up, and the engine took off, they found out later that someone didn't tighten down the diesel fuel delivery intake rail enough, and the rail (or something like that) was loose enough to where there was a free flow of diesel to the engine, and that's what made the engine take off, in terms of a diesel run away. Peter, I know the thought of a diesel runaway is a little bit of a scary type of thought to have happen to you in particular, but, would you and john know what to do in that weird rare event that event that your engine does miraculously takes off on you?
Having driven buses since the early 80s, I have always heard about that infamous “runaway engine“ danger. But in all those many years in the bus business and now driving RVs for the past 15+ years, not only have I never experienced a runaway engine, I don’t personally know anyone who has, or even anyone who’s heard personally of someone who has. I think that the likelihood must be pretty minuscule. That said, barring an emergency shut off switch, which I don’t think even exists in modern diesel engines, or at least not that I’m aware of, the only thing to do is get the hell away from the vehicle, and warn everyone else to do the same.
@@RVgeeks Yeah, I do know that diesel runaways could get dangerous, one things I didn't mention earlier is that my father and a few of the other guys at the time were able to get the engine to stop, I think they used a piece of cardboard on the air intake to stop the engine, I know my grandfathers friend (same guy as before with mentioning about my father) was a mechanic as far back as the 1970's, and coarse, that was during the time of the detriot diesels, at which were famous for running away, I actually think my grandfathers friend actually mentioned that there was something that the manufacturers actually put something on the air intake (or something like that) in the chance that the engine took off. Well, in the 1970's, my grandfathers friend was working at the time on a truck with some one else at which had a detriot diesel in it, I forget what the other guy did to end up with the result, but, the guy started the engine, and the engine took off, the one guy jumped out of the truck and he did manage to reach in and hit the device that got the engine to stop, but he got burned by the tail pipe in the process. I know some people mention about being able to use a fire extinguisher to also stop the engine, assuming you do aim it into the intake when you use it. Coarse, yeah, you'd end up having to take the top of the engine off to get the powder out of the engine. but, hey.
Can anyone explain the reason why coolant should not go down the "vent tube"? How does coolant not end up in the tube as the coolant is circulating and going up to the top of the cap? I would think coolant would go down the vent tube as the system pressure increases and water is force to cap. Right? Sorry but I'm confused by this vent tube.
It simply helps to allow air to come up and out of the system during filling. If you pour coolant down the vent tube, it will then require more effort to purge all the air out of the system, since you've prevented some of that air from coming out during filling, by blocking its natural route of exit.
This looks above my skill level but I have a couple questions. I just got a mobile grooming van with this generator that only has 25 hours on it but is several years old. I am planning on doing an oil, oil filter, and air filter change myself soon as I think I can handle that. Basically I am confused on how the coolant system works. I can’t tell if it needs more coolant. I can’t see much of anything in the compartment to the side of the panel. Do I add coolant to that compartment until I am in between minimum and full? Or do I add it to the hose shown in this video? Does it matter if the coolant in there already is a little different than the coolant I buy? Or should I pay for someone to do this whole process since it’s a couple years old even though it’s at low hours? Also, would you recommend doing a fuel filter change at this point?
Hi Rachel! When buying a used RV, we highly recommend doing the routine maintenance & changing fluids, unless the seller has recent documented service records to show when it was done, and you're sure it's not due. The thing about generators is that the ones with the lowest hours often have the most problems, due to lack of use. We'd suggest that barring any service records being available, you should be able to handle the oil & oil filter replacement, cleaning the spark arrestor, replacing the air filter, and replacing the fuel filter. The coolant is challenging enough that we'd suggest leaving it to a pro unless you're pretty confident. As far as mixing fluids.... don't. If your coolant needs a top-up, only use the same type that's in the system already.
RVgeeks Thank you for your advice. I ordered the parts to do everything but the coolant change by myself but the soonest appointment I could get with Cummins for the coolant was 20 days from now. I need to run the generator to do the other services but I’m worried about running it with low coolant and the old owner does not remember the exact one she put in to top it off with. Should I add deionized water for the 20 days before my appointment so I can do the other stuff?
You could do that, but also keep in mind that if you run it as is, and it overheats, it will shut down to protect itself. If it runs okay, you’re good to use it until the coolant gets replaced.
Wow that's quite the endeavor. So at $130 an hour how much does this process cost at Cummins shops?
Not sure the price of just the coolant change, but Cummins has some specials going on right now, and I think some of them include cooing system service with other maintenance. now.cummins.com/rvgeeks
I know this a not a smart question but I want to be 100% sure. The plastic tank I see on the right at 10:56 is a washer fluid tank not a coolant tank correct?
You got it! That’s the RV’s windshield washer fluid tank all right. Great spotting!
@@RVgeeks ThankYou
I thought you didn't want to fill past the two smaller hoses? ~ can you explain?
You need to leave them open for air to escape while you're filling the system. Once it's mostly full, all the air has escaped and you can fill it all the way right up and past the tubes.
RVgeeks great answer! I was wondering the same thing! I’m so excited to do my own service and not pay $145/hr labor! 😃
Plus a jar of Vas-e-line and one pair of gloves LOL!
How do I check coolant level in a side radiator diesel motorhome
Hi David. We also have a side radiator, and the overflow tank and coolant cap are easily accessible at the back of the engine. There has to be some way to add coolant, so we’re guessing you must have some sort of access as well.
Can you change the thermostat without draining the coolant?
We have never tried it, but since it’s on top, guessing you could release the pressure on the system by opening the radiator cap (on a cool generator) and then replace the thermostat and any coolant that runs out. If you don’t need new coolant but need a new thermostat, it might be worth a try.
Where did you get the bamboo mat?
Got it on eBay about 18 years ago. Tried to replace them about 5 years ago, and they’re all super cheap now. 😒
I am not able to see amount of antifreeze that is left inside the antifreeze overflow tank, especially hard to view thru the translucent white plastic holding tank.
What amount is suggested in depth 1" - 2" etc.
Generally I' ll need to check depth using a long stick or equivalent measure that shows dampness of the depth.
baldtbird.06
So...I need to add antifreeze #1 into the black pressure hose until I can see antifreeze fill to the top of the filler hose. PLUS ALSO #2 ADD same Antifreeze into the overflow holding tank also until tank is 1/2 full ? My holding tank is now empty and seems to be empty when always generator is off and cold ?
SORRY TO BE SO ANAL ON THIS !
Fill the radiator first until it's as full as you can get it, then add some coolant to the overflow tank until it's between the low and full lines. The radiator can pull coolant out of the overflow tank, or expel excess coolant into the tank, as needed. We keep the radiator full, and the tank half full, and it works great. We have a different brand than you do, but it should work the same.
How much coolant? I can’t find it in my manual. 4qt or 6.6qt? I have seen both online nothing on my manuals. I have a 7500
The manual for our 7.5 kW Onan QuietdDiesel genset says 4.2 quarts (or 4 litres)
@@RVgeeks I found it on there finally. I wanted to ask when you do coolant flush do you put anything in expansion tank or just only in the radiator part?
@@iscreamcandytv9642 We fill the expansion tank, too. About half way between the “cold minimum” and “hot maximum” lines.
Is this 4.2 gallons PLUS 4 liters?
4 liters is 1.057 gallons.
4.2 gallons is 15.899 liters.
Which is it please?
I have no manual.
Hi PJ… our manual says 4 liters OR 4.2 quarts (which is what 4 liters equals)
How many hours is considered allot on a 7500 diesel? I have 1,450.2
If it’s six months old, that’s a nice healthy amount of use. If it’s 10 years old, it’s barely broken in! Diesel engines are built to last.
@@RVgeeks it’s 21 years old. ThankYou for responding
Last question, I promise. Have you ever replaced the Engine V belt or had it replaced?
@@QLFProductions In our 18 years owning our motorhome, we never replaced the belt, and it was never a problem. While I did all the maintenance on the generator myself, we did ask Cummins their recommendation about replacing belts and hoses. They said if I looked at them, and they were in good shape, just leave them alone and they’d be fine. We’re not 100% sure how many total hours were on our generator when we sold our RV this past spring, but it was definitely fewer than you had by a little bit. Maybe about 1000 hours if we had to guess. The only thing we ever did was change the oil, oil filter, and air filter each year, along with cleaning the spark arrestor at the same time, and changing the fuel filter and flushing the coolant on the schedule recommended by Onan. One thing we could suggest if you have some concerns or your generator is having any issues is that even if you normally work on it yourself, maybe make one annual maintenance appointment at an Onan dealer to get some professional eyes on it. In all those years we had it, we had only one instance of any type of failure, where we had to take it in to be repaired. While it was there, we asked them to inspect it, and even though it was already over 10 years old, they told us the belt and hoses look great, and to leave them alone. Hope this helps!
@@RVgeeks it helps tremendously, I want to be responsible with maintenance like you guys and the manual says replace the belt every 1000 hours. You have to remove all the covers and the belt is in the back. Impossible to do if it doesn’t slide out. I’m at 1400 hours and all is well. I think I’ll wait a bit longer before having the belt changed. There’s a TH-cam video of a guy changing the belt on the 7500 at 5000 hours and the belt still looked great. I wonder if you guys still have an RV. That’s not a question because I said I wouldn’t ask anymore questions lol. Your videos have been a tremendous help. All of them!
Hey guys: I’m the master of obvious questions, and I will now dazzle you with my wizardry. When you fill the tube all the way to the top, how do you prevent coolant from entering either the vent or overflow tubes?
Hi Ed! A little bit of coolant is bound to get in there at the end, but don’t worry about the that small amount. No problem.
Aeromexico!
Your name is Birch ?
You must be rich to have a bamboo mat,I have to use a used chewys box LOL
Those cheap old mats are now 18 years old!
Generator runs good but no output power
William 👋
why gloves?
To protect hands when working with hot or contaminated substances, like anti-freeze or used motor oil.
you know those dont hurt you right? unless you ingest them
Well, for me it's actually several factors. 1) I don't have to ingest hot engine coolant for it to burn. 2) Used engine oils are carcinogenic (contaminated with heavy metals) and the skin is a perfectly good way to absorb that. 3) I have very dry hands, so try to avoid getting them dirtier than necessary to avoid excessive washing. 4) (this just goes for me mostly) I'm a cancer survivor who's had lymph nodes removed from my right side. So I try to avoid cutting my right hand, since it takes longer than usual to heal.
I know lots of guys who never wear nitriles when working, no matter how filthy the job. But I hate getting my hands greasy or cut, so even though I know I might get a little ribbing (especially doing it on camera!) for wearing them for many tasks where others don't bother, I do it anyway.
The guys who really should be the most careful with used motor oil are auto mechanics, who are exposed to it all the time. I used to work in a car dealership, and most of the techs wore nitrile gloves for every greasy job, and the shop provided boxes of them for their free use. With the few times I get my hands oily, my exposure is so low, I'm sure I'm in no danger from it. LOL
see now that makes sense, I was just curious.