Yammaha F225 or F250 owners....oil burning smoke question

[SmokyMtnGrady]

Hey Yall:
I take my boat to an authorized factory Yammaha service dealer which is not a Grady dealer as the nearest one is 3.5 hours away. Took my boat in for her first 100 hours service a couple weeks ago.

since then, every now and then after running the engine for 30 minutes or more, after we stop for 10 minutes and restart the engine it will smoke like a 2 stroke :shock: I searched the Grady forum and did not find this answer before I asked this question, so please be patient with me.

So, do you guys think they overfilled the oil? I have not checked the dipstick, so perhaps it looks like I am one :lol:, but I am hoping this is not a big issue.

What other issues cause an engine to burn oil on start up like this? Valve guides damaged/ worn? It seems with only 120 hours this would not be the case.

We repowered our old 192 with the F150 when Yammaha brought it out in 2002 and loved that motor, absolutely loved it. Ran it to over 500 hours without a single problem ever. I am hoping this is something simple like overfilling the oil reservoire versus something like valve issues.

Thanks

 

[CJBROWN]

Bob, there's a problem with that motor. If you just had a 100 hour service then it's under warranty - take it for warranty repair. They should not smoke at all!!

Definitely check the oil level. If it's over full it could foam and go up thru the crankcase vent and into the intake. You could get oil thru it that way. Could also be a broken ring or something and is sucking oil. Could be a defective valve seal too, sucking oil thru the guide(s).

Some of the new motors have been known to 'make oil', wherein the rings haven't seated yet and they get fuel blow-by into the crankcase where it dilutes the oil and over fills it. Not a good situation, for sure.

Some have used this as an arguement against a full synthetic motoroil as the rings don't seat well enough with it. Mine got Amsoil on it's second change at about 100 hours. At 300 hours now it neither uses nor makes oil, runs like a top. The oil hardly even starts to get dirty within 100 hours or one year.

 

[Bill_N]

My F225's don't smoke at all. Not even a wisp.

 

[JUST-IN-TIME]

TOO MUCH OIL!!!

how much you guys wanna bet that the oil is over filled!!!

 

[richie rich]

Interesting question....sounds like too much oil, but the caveat that was described said no smoke while running, but did upon start up after sitting a while......for a 4 stroke engine, whether car or boat, that usually means valve stem seal or guides.....it settles into the worn space when there's no more cylinder pressure and gets burned upon start up.....an overfull condition would cause a litttle blowby when running, not just at start up, no?? Either way...bring her back quick...there should be NO smoke.

 

[SmokyMtnGrady]

Thanks guys...I am taking her in tomorrow after we drop the kids off at their first day of school. It is odd as it is not smoking all the time. Every time it occurs is after we run the motor for more than 30 minutes and stop it for 10 minutes or so. Then it is not consistent, yesterday it smoked once and then that was it for the day, but boy did she put out the smoke. :shock:

Checked the oil pressure gauge while running and it was in the normal operating ranges. I called the dealer and reported the problem. Also, when the boat is stored, we keep the motor trimmed down. We always did the same with our old boat's F150. I will post the 'answer" to the question when we find it.

Bob

 

[lgusto]

Almost a thousand hours on my F250, never a trace of smoke.

 

[JUST-IN-TIME]

Interesting question....sounds like too much oil, but the caveat that was described said no smoke while running, but did upon start up after sitting a while......for a 4 stroke engine, whether car or boat, that usually means valve stem seal or guides.....it settles into the worn space when there's no more cylinder pressure and gets burned upon start up.....an overfull condition would cause a litttle blowby when running, not just at start up, no?? Either way...bring her back quick...there should be NO smoke.

also means a bad fuel pump on outboard motors

 

[richie rich]

Oil burn on a 4 stroke outboard can come from a bad fuel pump? Wow. Learn something new every day. Sounds weird though. Never would have guessed

 

[JUST-IN-TIME]

no

the smoke could be raw gas not atomized gas

 

[gradyfish22]

Just changed the oil in mine, I have 575 hours on each engine and neither one smokes at all. The Yamalube oil is changed roughly every 80-90 hours and comes out looking great, and could probably go another 50 hours but why take a chance. I was told by my mechanic that the oil level should be right in the middle of the dip stick when cool, not higher or lower, never had a singhle issue with oil level or smoking so I will stick with this until I hear something different or have issues. It is very easy to change your own oil, if your not having a Yamaha dealer do it, save yourself some cash and have a friend with a 4 stroke show you how, it is very simple and saves you a lot of cash. A few guys in my marina all chipped in and bought an oil exchange pump with the Yamaha fitting so it screws onto the dip stick, take little effort, just a few pumps and it sucks 95% of the oil out. I add a qt of new oil then pump that back out and that usually takes care of all the old oil. Seems to take roughly a hair more then 6 qts to fill each engine from my experience, If I am correct, Yamaha says it takes 6 or 6.1 qts for an oil change so that would solidify my experiences and put the level right in the middle of the hatch on the dip stick when cool. If this guy over filled the oil I'd request he fixes it, shows it to you and it should be FREE...oh and never use him again!! If he cannot do a simple oil change and get it right he by no means is qualified to touch your engine.

 

[JUST-IN-TIME]

yes half way up

do you know why half way, LOL

 

[richie rich]

JIT. That's why it sounded so strange. For a second you had me spinnin my wheels. Usually, A non atomized load of gas will cause smoke. But it will be a carbon smoke not a gray oil smoke which I understood was visually described ie smoked like a 2 stroke. And with a name like Smokey MT Grady you'd think he knows his smoke!

 

[SmokyMtnGrady]

I just may have to do the work myself :wink: . For me it is a time thing more than anything else. I will look into that oil pump idea. I have a 25hp yammy on my skiff which is also a 4 stroke and I have changed that oil before.

richie rich... yes, it was blue/grey oil smoke and not black carbon smoke. My first car was a datsun 310 which burned oil...know the blue smoke and my second car was my mom's 79 Monte Carlo with 278 small block V8. one of the bowls in the carb lost its plug and raw gas was dripping into the intake manifold. The car would send out burst of black smoke as it were a diesel. Fixed the leaky carb port using a lead fishing weight, black smoke gone.

Anyway, the dealer was cool about it. But I gotta tell you guys, it does give me pause if they did not pay attention to this. It just means if something serious happens, we will need to go further for a yammy repair shop.

 

[Gman25]

This is the A-#1 REASON I do all the maintance work on my F250's.Nobody is going to care for it like you will.

2005 300 Marlin w/F250's

 

[SmokyMtnGrady]

And the Oscar goest too......Too Much Oil in the motor. This irritates me to say the least. Then again, I should have just popped the cowling off and checked it myself

Time to roll up my sleaves and just do this like many of you do to your own boats and have suggested that I do it as well.

I enjoy working on the boat, but sometimes my time is more valuable to be with my business or my kids and it is worth my time to pay to have it done. The trouble is, it is not worth to pay for somebody to damage my boat.

Thanks for the input on this question. You folks have been great. This question and my out rigger question have both been answered well. I appreciate the input.

 

[richie rich]

Too much erl.....Just in Time wins the prize......so JIT, why half way up ?

 

[CJBROWN]

Too much erl.....Just in Time wins the prize......so JIT, why half way up ?

Hmmm...I think I said that in the first response to the OP:

Definitely check the oil level. If it's over full it could foam and go up thru the crankcase vent and into the intake. You could get oil thru it that way.

Not that I want credit, just sayin'...

THE HALF-MARK OIL FILL
My guess...they don't recommend the cold level to be at the high mark as the oil expands as it heats. Plus, outboard crankcase oil is known for fuel dilution and that could contribute to an over-full condition as well.

Perhaps for sitting in full-tilt position? So crankcase oil doesn't leak into the bottom combustion chamber?

Can our resident tech confirm?

 

[richie rich]

Details details details. Sorry for not paying attention. Now that we have an answer. The question becomes. Why not move the full mark to the half mark level and call it the full mark since that's where you need to run it propeely?

 

[JUST-IN-TIME]

if you change the oil drain it and do not suck it out, unless your slipped


reason why half way up, so you can monitor your burning of oil and the making of oil