The Onan 2. It is commonly used in recreational vehicles or as backup power supply for residences. If maintained carefully and tested regularly it should provide years of service. If the engine surges or runs poorly, it is likely that the carburetor needs cleaning and adjustment.
Examine the generator or consult the owner's manual to determine the type of adjustments possible on the generator. Newer models have an altitude adjustment knob for the fuel-to-air ratio. Set the knob for the altitude at which you will be operating the generator.
On these models, this is the only adjustment possible, and all other procedures must be done by a certified Onan service center. If you have an older model without the altitude adjustment knob, proceed to the next steps.
Remove the carburetor bowl from the carburetor by loosening and removing the bolt at its bottom. Clean the bowl with carburetor cleaner and blow out the openings with compressed air. Replace the bowl on the carburetor.
Locate the carburetor fuel adjustment screws, which may vary depending on the model. There is a main or high speed fuel adjustment, a low or idle speed fuel adjustment and an idle stop or throttle screw. Run the engine until it is fully warmed up. With the engine idling, turn the low speed adjustment screw counterclockwise until the engine speed begins to drop, then turn the screw clockwise one-quarter turn.
Run the engine at full speed with no electrical load. Adjust the high speed screw to obtain the highest speed. Allow the engine to slow down to an idle, then apply a sudden load to cause it to accelerate rapidly. If the engine hesitates, open the high speed screw another one-quarter turn.
This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us.
How to Adjust the Carburetor on an Onan 2. Step 1 Examine the generator or consult the owner's manual to determine the type of adjustments possible on the generator. Step 2 Remove the carburetor bowl from the carburetor by loosening and removing the bolt at its bottom. Step 3 Locate the carburetor fuel adjustment screws, which may vary depending on the model. Step 4 Run the engine until it is fully warmed up. Step 5 Run the engine at full speed with no electrical load. Tip To avoid problems, run the generator with a load about once a month for 20 to 30 minutes.
Warning Always work in a well ventilated area when using carburetor cleaner, and avoid sparks or open flames. Items you will need Spray carburetor cleaner Screwdriver Wrench Compressor or compressed air tank. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Onan is known for its standby generators.
However, they also make portable generators, especially those that go in RVs. Many Onan generator models can run on gasoline and liquid propane. Their generators are typically compact and relatively quiet. They often sell generators in portable shells that protect them while muffling the sounds it makes. Their generators regularly come with intelligent control boards capable of self-diagnostics, while most units have an integrated design that is incredibly easy to connect to your RV.
That is aside from the fact that Onan generators are often built into the RV by the manufacturer. Onan is one of the top selling generator brands in the United States. However, the brand has been picked up by Cummins. This means that you may have to search for the Onan part number in the Cummins inventory listed on a website. The units that do this are the ones drawing from the gas tank. In the future, top off your RV gas tank so that it never runs low. And know that the generator will shut down if the gas gauge is around one quarter.
Note that you can really run into problems if the gas tank float is off, so the generator turns off though you have a half-full tank. Onan generators have a number of built-in safety features.
HGJAA, HGJAB, HGJAC Onan Marquis Generators
Another is the low oil cut-off. If the generator is cutting off, check the oil levels. You can avoid problems by making sure the oil tank is full. It also means that an oil leak in the generator can kill it well before the unit suffers damage. If the safety feature trips and the generator is giving you an error code, look it up before assuming that resetting the generator is all you need to do.
For example, issues that make a generator run rough could be deal with temporarily, but the long-term damage will destroy the generator. Onan generators are among the smartest on the market. They can self-diagnose issues. Instead, it flashes codes to indicate the problem.
One solution is to check the manual. Then you can go to www. Even the error codes for older and rare Onan generators can be looked up on that site. Onan has made a number of design changes that simplify maintenance. On the other hand, you have to use the right oil and never use old oil to keep the generator from clogging up. Know the right level of oil, because over-filling will cause the generator to shut off just as too much would.Generator carburetors are prone to becoming gummed up with contaminants from old fuel, a deposit called varnish.
Without the addition of a fuel preservative, this can happen in as short a period as one month if the recreational vehicle, or RV, is unused. When this occurs, it will be necessary to remove and clean the carburetor as part of flushing the entire fuel system. Onan generator carburetors are typically of a primitive design, and their removal is straightforward so long as the layout of the RV allows easy access.
Use an adjustable wrench to disconnect the negative cable of the battery which serves to start the generator. This will typically be the coach battery. This is particularly important if your generator has a dedicated low-pressure fuel pump fitted in-line. Determine the location of the carburetor on your Onan generator. Use your owner's manual or follow the fuel line. If there are any control wires attached to the carburetor, use a tiny spot of different colored nail polish to mark each spade connector and its terminal and then carefully slide the spade connectors off the terminals.
Put the wires where they cannot be harmed. Onan carburetors do not typically have wiring to them. Use an adjustable wrench to free the nut holding the fuel line to the inlet port of the carburetor. Gently draw the fuel line away from the inlet, and cover the end with masking tape to prevent the ingress of contaminants.
Use a properly sized socket to remove the bolts holding the carburetor to the body of the generator's engine. There will typically be two bolts, but some Onan models have more. Put the bolts where they won't be lost. Draw the carburetor away from its location, trying not to damage the gasket.
Use a rag dipped in a solvent such as acetone to clean the face of the engine where the carburetor was sited, and then bunch up a clean piece of rag and insert it slightly into the hole in the engine to keep contaminants from entering. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.
To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Step 1 Use an adjustable wrench to disconnect the negative cable of the battery which serves to start the generator. Step 2 Determine the location of the carburetor on your Onan generator. Step 3 If there are any control wires attached to the carburetor, use a tiny spot of different colored nail polish to mark each spade connector and its terminal and then carefully slide the spade connectors off the terminals.
Step 4 Use an adjustable wrench to free the nut holding the fuel line to the inlet port of the carburetor. Step 5 Use a properly sized socket to remove the bolts holding the carburetor to the body of the generator's engine.
HGJAA, HGJAB, HGJAC Onan Marquis Generators
Tips Use a digital camera to take photos of the carburetor before removing it from the Onan generator. These will make valuable reference guides when reinstalling the unit.
Older gaskets may fracture when the carburetor is removed.
Be sure to check for this, and use new gaskets if necessary. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.In all instances, every effort is made to ensure the correctness of all content on the RV Doctor Website.
It is imperative that if you choose to follow any instructions or procedures outlined on any page of this website, you must first satisfy yourself thoroughly that neither personal nor product safety will be compromised or jeopardized. If you are in doubt or do not feel comfortable about a procedure, do not continue. Simply call your local RV service facility and make an appointment with them.
The advice, recommendations and procedures offered by the RV Doctor are solely those of Gary. They do not necessarily reflect the opinions, procedures and recommendations of our sponsors or advertisers. Read more info about the RV Doctor Website here. But in all cases, named products have been tested personally by Gary or to his strict standards and under his direction, by other RVers or service technicians.
Powered by Blogger and Hybrid. Bloggerized by Free Blogger Templates. Powered by Blogger. Previous Pause Next. We are saddened to announce the passing of the RV Doctor April 17, W e hope the RV Doctor website will continue to provide helpful information for you. First of all I enjoy reading your articles. Now, I have a problem with my gasoline Onan generator. My generator surges during idle. The voltage checks out at volts AC during idle or load. I've cleaned the carburetor, replaced the fuel filter, and replaced both spark plugs, all to no avail.
Can you please help me with the carburetor and governor adjustments? Michael, Clinton, SC.Motorhome Generator Repair Attempt 1
Well Michael, it certainly sounds like the governor is out of adjustment; basically hunting around for the proper frequency. At no-load idlethe frequency should measure around 62 or hertz.
Additionally, the no-load voltage should be a little higher; around volts AC. On your particular generator there are three separate carburetor adjustments and three governor adjustments and they must monitored and adjusted simultaneously. The load bank is the preferred method. Not all RV service techs, let alone RVers, realize that every mechanical action performed on the carburetor and governor will have a direct electrical response.
Therefore, the only way to adjust the RV generator properly is to make such adjustments while monitoring the output voltage and the electrical frequency, while applying a known load in incremental steps.
Unfortunately, the generator set-up procedures are too in-depth to fit within the confines of this column, but I do have a possible solution in the form of a training video I developed for professional RV service technicians. If not, I would recommend you find a properly equipped RV generator shop for those finite tweakings that are necessary. Call first to be sure they indeed have a load bank. Labels: AC ElectricalGenerator.
Newer Post Older Post Home. Disclaimer: In all instances, every effort is made to ensure the correctness of all content on the RV Doctor Website.By hayesfamilyNovember 27, in Electrical. Thats said, I decided to take apart my carburetor in the genny and not to my surprise, i probably will be purchasing a new one next season.
Now, Yall Diesel owners dont have this issue to worry about however, feel free to chime in because I am sure youhave dealt with it at somepoint. Many know I have had genny problems sense about April and I managed to work through most of them because whoever serviced the genny seemed to do 1 thing right and that was put a decent Mobil 1 oil filter on it.
The BIGGER issue with this fuel I traced back to a line that appears to be cracked above the sender, and in certain conditions allows air to come in thus causing the genny to starve for fuel. Milton took a look at both the hose and the carb and determined that the damage from the "Ethanol" has taken toll on the lines AND gummed the jet in the carb.
Prior to me taking my carb and hose to Milton he asked me to bring a few gallons of gas from my tank so he could examine it a bit closer.
One of the things he found was a presence of water in my fuel tank I am sure All of us who have gas coaches in the mid Atlantic have ethanol in our tanks sitting over the winter so unless treated if thats even possible we have dissolved deposits in our tanks as well as water because of Phase Separation; especially if you traveled to states like Tennessee, Florida, Georgia, and Texas who all have ethanol free gas stations and or pumps labelled ethanol free.
It sat from The Summer of until I bought it in October - and I wasnt aware of that until I did some odometer math and my issues started to make sense. So, if you are having genny issues Specifically fuel Relatedand they are reoccurring every few years, I suggest 2 things, and I am still experimenting to see if this is possible If you can, consider a way to put a separate tank in your coach specifically for the genny. I am thinking about taking the spare out and ditching it for a 30 gallon gas tank for the genny - not sure how i am going to do it.
It keeps "good" gas in the lines and in the carb. When replacing genny fuel lines skip the local advance auto E lined which is teflon lined hose. Its expensive but so is a motorhome! Be proactive I know I can not be the ONLY person with these issues so chime in if you have suggestion and or problems.
Keon, what about a gallon can of non ethanol with sta-bil or similar fuel stabilizer put a y in the fuel line just before the genny fuel pump, use two ball valves, one on the coach fuel system and one on the gallon can. Just before shutting down the genny, switch from the coach fuel to the gallon can, run the genny long enough for the non treated gas to be used and a good supply of treated gas to be used by the genny.
Now switch back to the coach fuel after the genny has been shutdown. Just a thought! Yeah that's kind of sort of the way I'm thinking. This is a video of what I did to bypass the main tank in general.RVs for Sale. Parts Superstore. Manufacturer Onan Manufacturing. Generator Type Inverter Generator. Fuel Type Diesel Gasoline Propane.
Power Output Watts 2, 2, 3, 4, 5, 6, 6, 7, Show 12 24 48 96 View All Showing 1 - 24 of Onan Pi Inverter Portable Generator. Cummins Onan Carburetor AP Quiet Diesel Onan Replacement Carburetor Kit. Marquis Gold LP.
Onan Premium Control Board Assembly Onan Control Board Assembly Cummins Power Generation 4. Regulator Onan. Under Floor Mounting. Under Floor Mtg.
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How to Adjust the Carburetor on an Onan 2.8 Generator
Onan Fuel Pump AN Back To Top Showing 1 - 24 of Looking for Onan Generator parts? We have a great selection available all in one place on our online store for an easy shopping experience. An Onan Marquis Gold RV Generators which can run two air conditioners with energy to spare, self-diagnostics capability and an easy install.
We will drive you crazy with our competitive prices and excellent service, too. Keep it cleaner with Onan Oil Filters When it comes time to maintain your RV or mobilehome, be sure you get the products that will last, and from a brand you can trust. Onan Green Label Parts oil filters are an excellent choice with valves that allow your oil to bypass the oil filter during cold starts, or if the filter becomes plugged up, which is not common among other oil filter manufacturers.
We want your drive to be smooth, and your next RV camping trip to be full of only great memories. Contact Us. Worth N Main St. All Rights Reserved, - Be sure to return next season to view preseason odds. We'll post early odds on NFL football as soon as they are available.
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How to Adjust the Carburetor on an Onan 2.8 Generator
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