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Old 09-14-2015, 08:09 PM   #1
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Do you change your own oil???

After watching the YouTube videos, I went out to my coach today and did an oil, oil filter, air filter and spark arrester service on my Onan Cummins generator.

I felt pretty good after doing it and started looking under the rear of the coach trying to figure out how easy, or difficult it would be to change the oil in my 340 Cummins.

I took these pictures and I am wondering if I am looking at the oil drain pan on the Cummins, and if so which of the plugs would be the drainClick image for larger version

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ID:	88696 the bottom one?

Also wondering which filter is the oil filter.

I know there's a lot of oil in there and I want one of this stop cock valves put on it....good idea???

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Old 09-14-2015, 08:20 PM   #2
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Bottom one. Oil Filter will have a part number that starts with LF. Might as well do the fuel and fuel water separator too. You will lose some diesel though. I haven't found a way to do it without losing about a gallon. I purchased a spare amber bowl for the fuel/water separator which makes changing that one a little easier.


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Old 09-14-2015, 08:29 PM   #3
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The drain plug in the bottom will drain the oil. The one on the side is for a oil heater for cold climates or for cold climates where that engine is used in different applications
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Old 09-14-2015, 09:24 PM   #4
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The oil filter is on the other side of the engine from the filters you picture, higher up, but still accessible from underneath. The oil filter should be preloaded before installation (about one and a half to two quarts) to prevent running without lube. It depends on the oil pan what your total fill is, but expect to use the best part of five gallons.

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Old 09-15-2015, 08:27 AM   #5
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I do mine myself also. Easy Peasy, just way bigger than a car or truck. Get a large oil pan. I got one at Wally World I believe it's 22 quarts.

Above post are correct. It's the bottom plug.
2013 Berkshire 390BH
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Old 09-15-2015, 12:40 PM   #6
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Originally Posted by edgewant View Post
Might as well do the fuel and fuel water separator too.
Are these two separate items?

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Old 09-15-2015, 12:48 PM   #7
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When I was younger I changed my own oil but now I do not as for $10 my mechanic will do it and take care of the mess. Not to mention my oil filter is a real PITA to get to. I just take the oil & the filter to him & 1/2 hr later I can be on my way.


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Old 09-15-2015, 02:10 PM   #8
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I worked as an automotive (gas and diesel) mechanic for 10 yrs. I was spoiled by having a lift, parts dept. and an EPA-approved disposal facility.
Do my own? Hell, no!
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Old 09-15-2015, 02:11 PM   #9
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Yes, there is a fuel filter and a fuel/water separator. The fuel/water separator has a clear yellow bowl on the bottom of it and the fuel filter looks like an oil filter. They should be right next to each other on the passenger side. Just be aware, when you remove the old filter, fuel will continue to flow out until the new filter is installed. Ask me how I know this (LOL!!).

I put a Fumoto valve on mine. Very easy to open to drain and close to shut it off. Makes changing the oil easier.
Tom and Margaret
2014 Berkshire 390bh-60

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Old 09-15-2015, 03:03 PM   #10
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Just be very careful that you put the correct filter in properly. I never blinked or even considered that an easy thing could be screwed up after having paid for 100's before. Wrong! My MBZ Sprinter Diesel engine was blown up and the starter ruined after it's very FIRST service. This RVdealership claimed their best tech did the work, scary.

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