Kinda hard to find *Accurate* info on our Yamaha F350 5.3L V-8 350HP

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Hey gang,
It's been a while. I decided it's about time for some engine maintenance on our 2014 Bennington 25RCL with the Yamaha 350HP 5.3L V-8 F350 engine. I figured I'd do an engine oil and filter change, a fuel or "both" fuel filter change, and the lower end gear oil change. I've been wrenching on everything that rolls for us for a few thousand years but like anything new, I had to look up some info prior to starting this little project. Stuff like how and where to drain and add oil, where and what type of fuel filter and or fuel filter/water separator and of course, the lower gear drive drain and add points.

Of course any and all paperwork we received with the boat pertaining to any form of engine maintenance etc. automatically tells you to RUN to the nearest Yamaha dealer if it's anything beyond LOOKING at the engine! Well, me being me, the first thing I did was tap into the infamous Youtube University library for info on the Yamaha F350. The first Youtube video pertaining to an oil and filter change DID apply to the 5.3L V-8 which was what I was looking for. The gent performing the oil change stated the engine took 7.8L of oil. Well, that converts to 8.3 quarts. Everything I'd looked up, in terms of "kits" for servicing the Yamaha F350 showed only 7 quarts of oil. Hmmmm. Well, it didn't take long to find out that in Yamaha's infinite wisdom, they had/have TWO VERSIONS of the F350. One is the 5.3L V-8 and the other is a V-6. Not really realizing that, I'd come close to pushing the "place your order" on good ole Amazon for oil, and all the filters etc.

I did order 2 gallons of 10W-30 Valvoline 4-stroke Marine Oil with the "FCW" rating and I'd found out that there's this wazoo fancy wrench for removal and replacing of the fuel filter water separator housing that has about a zillion ribs on it. I figured 2 gallons is 8 quarts so, running .3 of a quart low wouldn't blow the motor up but, I'd more than likely run down and pick up another quart before it actually was put back into the water. But, just because I was actually having quite a difficult time finding accurate info on the 5.3L V-8 version and could find info on the V-6 version all day, I thought what the heck, even though parts and components at our Bennington dealer here in town are typically quite a bit more in cost, I called them and asked if they had all the filters I needed for the the maintenance project. They had all I needed. And the oil filter number I'd gotten off Amazon which, was SUPPOSED to be for the V-8, the parts person said it was for the V-6, CRAP!!

So, I purchased all of the filters, (1) oil, and (2) fuel filters, one on the engine and the typical larger blue one that hangs off the back side of the deck for only about $5-$6 more than it would have been from Amazon. AND THEY WERE ALL THE CORRECT PARTS!! Sorry for the long novel about my ordeal but it was just sort of frustrating that even the Youtube info was way off. When I finally removed the engine cowling, I found where to add the oil after I'd drained and, guess what I found??? There, right next to the fill port was/is a sticker that states: 6.5 quarts of oil WITHOUT filter change and, 6.8 quarts WITH the filter change. Sooooo, all the "kits" on Amazon with 7 quarts, were actually accurate.

Now, pertaining to the lower gear oil. That's another story. I'd removed the drain plug and nothing came out. I didn't fret over that because, like many videos on Youtube, not much comes out until you loosen or even remove the fill port plug. But, I loosened it and even removed mine and the oil "started" to flow. But, get this folks, It was BLACK as it could be!! And thick, man, you'd have thought I was changing gear oil in the Alaska wilderness during a blizzard. There was no signs of water but that oil was seriously black and of course, it stunk up the entire garage and permeated into the house some. Needless to say, the CEO wasn't all that happy. But, I'd already had a couple of quarts of QuickSilver 90W gear oil hanging around so, I used a quart to replace that black goo. What I'm gonna do is, run that new gear oil for about 1 maybe 2 times out on the water and then change it again to sort of flush the remaining black goo out. Anyway, sorry again for the long winded report. I'm ready for the water now!
Scott
 
I use partsvu.com for my yamaha motor filters, oil, etc.. They have competitive prices and ship quickly.
 
How you doing Scott! When was the last time the lower unit was changed to be that thick and black and did you change the impeller?!?
 
Hey Big Kahuna,
Doing well Sir, thank you for asking. In terms of history, we purchased this boat from the wife of a good friend who died due to cancer. We purchased it around 6 years ago and it had a whopping 24 hours on it at the time of purchase. She, his wife, had minimal papers on the boat that she gave us. Included was the original sales sheet and one or two warranty repairs, that's it. So, we have no paperwork pertaining to any servicing of any type. Soooo, in all honesty, since we've (I) have not done ANYTHING to this Yamaha F350 350HP 5.3L V8 in the 6 years, no, that lower end oil has NEVER been changed. This is for the most part embarrassing to me.

I've been wrenching since before Christ was a pup and do all my own maintenance/repairs/alterations/modifications and a lot more. But, this is one of those things that, since this boat and this engine are so flawless, I just sort-a took the dependability and reliability all for granted and just used the boat. Well, it finally hit me, not through any damage or issues, what hit me was the fact that we'd had it for this long and I've not done ANYTHING to the engine pertaining to maintenance. Yep, ought to have my hand(s) slapped for sure. I'm just glad that, even though the oil looked like it just came out of the ground, that there was no signs of water. As stated earlier, I'll run this present brand new oil for once, maybe twice out (usually around 5-6 hours or so each time out) and then, re-drain it and install new oil again. That ought to clean things up inside that lower end sufficiently.

RE: the water pump impeller, nope, just like the rest of the maintenance, I've not done a replacement nor has any service center near me. I'll look up what it takes for a replacement of that impeller on my particular engine and then decide if it's gonna be me or a service center.
Scott
 
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