Onan Rv Generator for sale nowadays are very affordable. Once purchased, and then Understanding the inner operations of a motorhome alternator and how it must be maintained can conserve loan, trouble and time
While it’s real that the 12-volt DC system will keep your lights on, other modern conveniences that run on 120-volt Air Conditioner power (like the TV, air conditioner, microwave and other home appliances you may bring) won’t be available in the alternator goes down when you’re boondocking. Your best defense against such a scenario is regular alternator upkeep.
Most of us wouldn’t think of purchasing a car and truck, driving it a few miles each summer season, and then neglecting it the rest of the year, however, that’s basically what a lot of motorhome owners do when it comes to their 4000 power cell.
A unit is comprised primarily of an engine, one that shares a lot of resemblances with other engines including (when it comes to a fuel alternator) an oil, carburetor and air filters, belts and other components. You might have grown familiar with that power plant roaring to life whenever you push the start button, but all it takes is a couple of months of the overlook and the alternator can leave you in the dark– actually.
To get some skilled guidance on alternator maintenance, we went to Smith Powerhouse Inc. in Bellflower, California, a factory-authorized service and service warranty center. is available. Owner David Voloshin and shop supervisor Matt Rudametkin have licensed master alternator professionals who have nearly 50 years of experience between them, and they’ve seen it all.
By far the most common motorhome gas unit in usage today are the 4,000-watt Cummins (known as the MicroLite, 4000, MicroQuiet 4000 and the QG 4000), 5,500- and 7,000-watt Cummins(referred to as the Marquis Gold 5500 and 7000 or QG 5500 and QG 7000) and the Cummins Quiet Diesel alternators, so these will be the focus of this post. While the most frequent types of upkeep, such as oil/filter and stimulate plug modifications shouldn’t show too challenging for most DIYers (and can save some money), Smith Powerhouse advises versus more advanced maintenance procedures for 2 crucial reasons: One, you will likely do more harm than excellent if you do not understand what you are doing; and 2, there are lots of methods to seriously harm yourself. When it comes to major set up upkeep, it’s finest to leave the heavy lifting to specialists like Smith Powerhouse.
With all that stated, let’s take a more detailed take a look at what’s inside those familiar green (or black) boxes.
Cummins MicroLite, MicroQuiet, mobile home QG 4000
 This is what the majority of us are familiar with when we open the alternator compartment door: a plastic box that tells us little or absolutely nothing about its inner workings. However the popular Cummins 4,000-watt gas power cells are simple to service. Start by turning the two black levers to launch the front cover.  The Cummins 4,000-watt machine is a single-cylinder, air-cooled engine designed to run on gasoline. Above the start/stop switch (A) is the carburetor (B), which is fitted with a mixture screw (C) at the bottom to allow minimal modifications. The cover emblazoned with “OHV” is the valve cover. The bottom right is the yellow oil filler/dipstick (D). Keep in mind the big brush assembly (E); this serves as a gasket to compartmentalize the engine parts when the cover remains in place, promoting appropriate airflow from the fan (at left, not visible) over the important engine components. Make sure you have the ID tag information (F) on hand when buying parts.
 Inspecting the oil resembles any other engine: Unscrew the cap and note the level. If the power cell has been properly preserved and the oil has been altered at the advised intervals, it must be brown like this– not dark brown or black.  Before altering the power cell’s oil, run it at least 10 minutes to get it up to running temperature level, which assists the oil drain easily and totally. Motorhomes factory-equipped with an alternator like this one (or perhaps alternator prep) will have gain access to the panel underneath the power cell compartment. Merely remove the 2 screws and the drain plug will be exposed.
Get rid of the plug, and enable the oil to drain pipes into an ideal container. The Cummins 4,000-watt power cell only hold 1.7 quarts of oil, so this procedure goes quite quickly. This power cell does not utilize an oil filter, so all you have to do now is change the drain plug and access panel, and fill up the crankcase with the advised oil.
To the right of the yellow oil filler is a gray (in these circumstances) or black spark-plug-cover boot. Pull it down, and the end of the engine’s 6.5 single stimulate plug will be exposed. The plug can then be gotten rid of with a common spark-plug wrench and inspected/replaced.
These Onan Rv gold Generators for sale nowadays come equipped with a little fuel filter that needs to be changed periodically according to the maintenance schedule. Eliminate the fuel-hose clamp (A) first, then pull the hose off the filter barb. The filter assembly is threaded and can be quickly eliminated with a 9/16-inch deep socket.
Cummins MicroLite, MicroQuiet, QG 4000
 This is what most of us are familiar with when we open the alternator propane compartment door: a plastic box that tells us little or nothing about its inner workings. But the popular Cummins Onan 4,000-watt gas alternators are actually very easy to service. Start by turning the two black levers to release the front cover.  The Cummins 4,000-watt power cell is a single-cylinder, air-cooled engine designed to run on gasoline. Above the start/stop switch (A) is the carburetor (B). The cover emblazoned with “OHV” is the valve cover. Bottom right is the yellow oil filler/dipstick (D). Note the large brush assembly (E); this acts as a gasket to compartmentalize the engine components when the cover is in place, promoting proper airflow from the fan (at left, not visible) over the critical engine components..
 Checking the oil is similar to any other engine: Unscrew the cap and note the level. If the alternator has been properly maintained and the oil has been changed at the recommended intervals, it should be brown like this – not dark brown or black.  Before changing the alterantor’s oil, run it at least 10 minutes to get it up to operating temperature, which helps the oil drain easily and completely. Motorhomes factory-equipped with a power cell like this one (or even power cell prep) will have an access panel underneath the unit compartment. Simply remove the two screws and the drain plug will be exposed.
 Remove the plug, and allow the oil to drain into a suitable container. The Cummins 5.5 watt only hold 1.7 quarts of oil, so this process goes pretty quickly. This machine doesn’t use an oil filter, so all you have to do now is replace the drain plug and access panel, and refill the crankcase with the recommended oil.  The air-filter housing is also clearly labeled, and the element is easy to inspect/replace. Simply remove the wing nut on the side of the housing, and then remove the wing nut that holds the filter in place. The filter can then be pulled free. This one still looks in good condition; a filter in need of replacement will be a dark color. When replacing the filter, be sure to reinstall both wing nuts, not just the one on the housing, or the filter will not be seated properly and will not clean incoming air.
To the right of the yellow oil filler is a gray (in this instance) or black spark-plug-cover boot. Pull it down, and the end of the engine’s single spark plug will be revealed. The plug can then be removed with a common spark-plug wrench and inspected/replaced.
These systems also come equipped with a small fuel filter that should be replaced periodically according to the maintenance schedule. Remove the fuel-hose clamp (A) first, then pull the hose off the filter barb. Next, pull the rubber gasket out of its groove to gain access to the filter. The filter assembly is threaded and can be easily removed with a 9/16-inch deep socket.
 An inexpensive upgrade Smith Powerhouse recommends is a second fuel filter (located inline in an accessible location) to further ensure against dirt and grit entering the fuel system.  The most common cause of hard starting (or not starting at all) in a motorhome power cell is lack of use. Smith Powerhouse recommends running a machine every four weeks with two hours under load (such as running an air conditioner) to keep it properly exercised. The discoloration at the bottom of this carburetor float bowl means that fuel sat there several months, and the deposits clogged the tiny orifices in the carburetor. Once allowed to deteriorate to this point, you’re looking at a $300 bill, plus removal/replacement labor. If running the microquiet 4000 unit regularly isn’t an option, Smith Powerhouse recommends installing a shutoff valve in the fuel line before the alternator. Turn the valve off, then run the alternator until it is out of fuel. Adding a fuel stabilizer (OnaFresh) is also recommended.
 Don’t forget that the recreational vehicle cell is more than just an engine – it’s a power-generation system. This damage is not easily repairable and will more than likely require the attention of a professional. power cell-0093
 The Cummins 4,000-watt power cell is an overhead valve engine, complete with valve springs and rocker arms. Valve clearance is adjusted in a similar fashion to many other engines, with a pair of wrenches and a feeler gauge. However, neither Smith Powerhouse nor Cummins recommends you try this yourself.
Smith Powerhouse conducts this test with every 50 amp it services. alterantor-0088
Cummins Marquis Gold/QG 5500 and 7000 power cell
 Another very popular motorhome gas machine is the 5,500- and 7,000-watt Cummins power cell, typically found in larger gas Class A motorhomes. It is a V-twin engine oriented on its side, with the valve covers facing up (the right cylinder is visible). Though it is a completely different design from the Cummins 4,000-watt diesel generators, many maintenance procedures are similar. Note, that the oil fill/dipstick is in the same location as the
 The air cleaner uses a paper element that is readily accessible from the front of the unit. Simply unsnap the clips and the cover comes right off. This filter element still looks good.
 Draining the oil on the 5500 and 7000 is simple, since it uses a petcock instead of a drain plug. Warm the onboard engine, then put a pan underneath and open the petcock; the oil is routed underneath the coach through a rubber hose.
 Unlike its smaller brother, the twin-cylinder 5,500- and 7,000-watt alternators do have an oil filter that looks like a small automotive filter. It is accessed through a hole in the bottom of the power cell compartment. Both the replacement filter and handy wrench are available through Cummins onan dealers.
 The Marquis Gold has its spark plugs oriented on the sides of the cylinders (A), which can make them a challenge to reach. A swivel socket does the trick here. Removing the left (or No. 1) cylinder spark plug requires the removal of the air-filter assembly first.
 Depending on the year and model, the 5,500- and 7,000-watt alternators may actually have two fuel filters: this secondary one, near the carburetor, and a primary one at the fuel pump. Be sure to inspect your particular machine to see if it has two; Smith Powerhouse says a lot of home mechanics don’t know about the primary filter, so they don’t replace it and wonder why the power cell still doesn’t run properly.
Cummins Quiet Diesel
Onan Rv power cell that are affordable and Diesel alternator are typically located in the nose of the motorhome, so most of the items you’re likely to maintain in Quiet Diesel alternators are located here, such as the oil fill/dipstick.
[2, 3] On Quiet Diesel 6,000-, 7,500- and 8,000-watt, the radiator cap is located underneath a plate to the left of the coolant fill. Remove the fastener that secures the plate, then lift up on the plate and pull it toward you. You can then pull out the filler neck and remove the cap to check the coolant level in the radiator. Only remove this cap when the engine is cold; removing it when hot can result in severe burns.
 The coolant fill is just to the left of the oil fill/dipstick. It is important to note that this is an overflow bottle, similar to the one next to the radiator on your automobile. Its level goes up and down depending on power cell temperature, so just because it is full does not mean the radiator is full.