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Old 05-03-2007, 06:29 AM   #1
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Well, what I thought would be a pretty simple task turned out to be a real PITA. The gen is a 7500 watt "Quiet Diesel". After gathering the needed supplies, I slid under the front of the rig and put a 3/8" socket on the oil drain plug. I ran the generator for about 5 minutes prior to warm the oil first. I quickly learned that the plug was nearly cemented into the drain hole. After about 5 minutes of grunting and groaning and nearly rounding off the head of the bolt, I finally got it to loosen. I wound up getting a hammer to tap the socket onto the bolt as far as it would go and braced a foot on the frame to get it to break loose.

I had the oil pan ready, so I loosend the nut by hand and promply dropped it in the oil pan. Figures. I had spread news paper around under the pan just in case, which was a good thing. Just as the oil starts pouring out, a breeze came up and blew oil all over the driveway and me. Figures. Finally get the oil drained and turn my attention to the filter.

Open the filter door, and see the filter fairly accessable. Well, it was installed by a gorilla as well. I had to get a large pair of channel lock pliers opened all the way up to grip the end of the filter to break it loose. Interestingly, the filter that came on the gen from the factory is quite a bit smaller than the replacement new filter. Even the documentation that came with the generator states that the new filter will be larger than the one the came from the factory. It must be because it was considered a "break in" filter, and only intended to be used for 50 hours.

After the old filter was off, the new filter and oil took 5 minutes to replace. It used 3 quarts of good quality diesel oil. The next change is not for 150 hours. The next one will be MUCH easier!

I saved about $100 bucks doing it myself from what the dealer wanted, and I know it was done right. All in all, it was still worth doing it myself.

Sarge
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Old 05-03-2007, 06:29 AM   #2
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Well, what I thought would be a pretty simple task turned out to be a real PITA. The gen is a 7500 watt "Quiet Diesel". After gathering the needed supplies, I slid under the front of the rig and put a 3/8" socket on the oil drain plug. I ran the generator for about 5 minutes prior to warm the oil first. I quickly learned that the plug was nearly cemented into the drain hole. After about 5 minutes of grunting and groaning and nearly rounding off the head of the bolt, I finally got it to loosen. I wound up getting a hammer to tap the socket onto the bolt as far as it would go and braced a foot on the frame to get it to break loose.

I had the oil pan ready, so I loosend the nut by hand and promply dropped it in the oil pan. Figures. I had spread news paper around under the pan just in case, which was a good thing. Just as the oil starts pouring out, a breeze came up and blew oil all over the driveway and me. Figures. Finally get the oil drained and turn my attention to the filter.

Open the filter door, and see the filter fairly accessable. Well, it was installed by a gorilla as well. I had to get a large pair of channel lock pliers opened all the way up to grip the end of the filter to break it loose. Interestingly, the filter that came on the gen from the factory is quite a bit smaller than the replacement new filter. Even the documentation that came with the generator states that the new filter will be larger than the one the came from the factory. It must be because it was considered a "break in" filter, and only intended to be used for 50 hours.

After the old filter was off, the new filter and oil took 5 minutes to replace. It used 3 quarts of good quality diesel oil. The next change is not for 150 hours. The next one will be MUCH easier!

I saved about $100 bucks doing it myself from what the dealer wanted, and I know it was done right. All in all, it was still worth doing it myself.

Sarge
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Old 05-03-2007, 06:47 AM   #3
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I have this task to do and I expect to go through exactly what you went through.

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Old 05-03-2007, 06:17 PM   #4
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Sarge

You and I muct have graduated from the same oil changing school. I have this to look forward to in the near future. I have a 2006 that I bought last month, so I think I will need to change the oil soon. Changed the engine oil last week and that was a learning experience. I took 3 phone calls to get the right amount of oil to put in the engine, from Cummins and Monaco. Thanks for the heads up s/Toby
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Old 05-03-2007, 06:23 PM   #5
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I'm doing mine tomorrow (May 4th). However, this is the second time for my generator oil change and it will be much easier. I went through your experience the last time. I think the guys at the factory are laughing everyday that they torque the filters and drain plugs in place.
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Old 05-03-2007, 07:29 PM   #6
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ok , WELL WHAT IS THE TORQUE ON THE DRAIN BOLT/SCREW.

i WILL BE DOING MINE IN A FEW DAYS....
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Old 05-04-2007, 05:41 AM   #7
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Yeah, I changed the engine oil a few weeks ago. I thought that would be more difficult, but it turned out to be a breeze. This little job was a pain. Interestingly, the Onan manual did not list a torque for the oil plug. It just instructed you to "tighten the bolt securley to prevent leaks". I have put on hundreds of oil pan plugs without a drip, so I wasn't too worried. Just snugged it down, and checked it after I filled and ran the generator for about 5 minutes to circulate the new oil. No problems.

Just be very gentle with that plug, as I was close to screwing up the head of the bolt trying to get it out. I would recommend running the generator until it's hot, breaking the plug loose, then let it cool a little before you take it the rest of the way out to avoid getting burned by the hot oil. The hot metal will expand some, and should make the plug a little easier to break free.

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Old 05-04-2007, 05:58 AM   #8
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Similar experiences here with first oil change, but subsequent one went smoothly.
Sarge, you comment about heat expanding the metal makes me wonder if someone would actually be be better off trying to break loose the bolt when the genset is cold, then lightly tighten it during the oil warm-up before removing it for draining. Maybe one of you guys who are doing the first change can "experiment"...
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Old 05-17-2007, 12:04 PM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Scratch & Goose:
ok , WELL WHAT IS THE TORQUE ON THE DRAIN BOLT/SCREW. </div></BLOCKQUOTE>

On my Microquiet 4000 (gas) the manual says 21 Lbs/Ft or 27 N-m. I looked at the 7500 Quiet Diesel manual online (www.onan.com) and it only says to "tighten securely"...
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Old 05-17-2007, 03:43 PM   #10
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I feel for you. I got lucky, bought the coach used and the dealer changed all the fluids before I took possesion. His 500# gorilla had the day off, so when I changed it a couple of months ago, it was pretty easy. I have Fumoto drain plugs on the coach and toad, so they are pretty easy. I try for calm mornings as there is now way to make the oil filter change out any less messy.
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Old 05-17-2007, 04:04 PM   #11
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That same gorilla put my plug in too...I had to bring mine to my local shop because I broke my wrench trying to get it loose...I have just received the Fumitomo oil drain plug with nipple that I will install...a very neat little device!!
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Old 05-19-2007, 03:44 PM   #12
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Have any of you guys ever tried punching a hole in the bottom of your oil filter first to drain it, before removing it, way easier, and cleaner.
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Old 06-06-2007, 06:39 AM   #13
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Good Idea. On my genny the filter is in the side of the generator and there is absolutely no way to get it out without oil running down the side of the genny.
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Old 06-20-2007, 01:36 PM   #14
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I might try that on the next go round as well. I managed to make a pretty good mess on the driveway.....
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