Yam SWSII 250 (Hey Rodbolt)

[nestor]

Ok, this is an update:

Went out today out of Port Everglades. About a 45 min idle out hit the throttle, and after just a moment or two above 4200, the starboard engine rev'd up/ then down, alarm when off, and both dropped below2000. Once in neutral, alarm is off and back in gear no problem cruising to about 4000-4100. Go over 4200 on the starboard and alarm again. Full oil tanks and both engines are peeing fine. Pulled the cowling on the water when the alarm went off, side tank full to the line.

Now for the kicker: Trolled about for around 3 hours and kicked it up to about 4300-4500 all the way in with no problems. hmmm...

Here's my setup:

2002 SWSII 250's.
850 hrs (ish)
Annual service done a couple of months ago (35 hrs ago)- New low pressure pumps, new VST filter, plugs, fuel filter,impellers, lower unit oil change, new thermostats and now new O2sensors and gaskets.

Any thoughts?


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Nes
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[yamamarinetech40]

Re: Yam SWSII 250 (Hey Rodbolt)

This engine has a knock sensor on the port side of engine....have you got a winky-blinky to check engine codes? Have you done this? Code 17 is knock sensor....

 

[yamamarinetech40]

Re: Yam SWSII 250 (Hey Rodbolt)

Didn't finish....the knock sensor will send the engine into reduced RPM(like yours is doning)...just a guess,could be other things....

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

Didn't finish....the knock sensor will send the engine into reduced RPM(like yours is doning)...just a guess,could be other things....[/qu


Haven't checked that yet. Would this also set-off the alarm? Also, when it happens, both go into reduced mode. (didn't know if it made a difference.

 

[rodbolt]

Re: Yam SWSII 250 (Hey Rodbolt)

code 17 wont set an audible.
knock sensor is most likly not a problem.
both engines powering down means the DES switch is ok.
when it was powering down and the bells and whistles sounding, ok, just the horn. what indicators did you get on the yamaha digital tachs ?
cause I am long on things to check and some your not going to like.

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

On the tach, the starboard engine, it shows when the engine hits 4200 or higher, it revs up/down, up/down, alarm goes on, both engines drop.

I throttle back both engines to neutral, alarm turns off life is fine...(until I go over 4200 again).

Nothwithstanding it ran fine at 4500 on my return last trip. I'm not a subscriber to the "it fixed itself" theory...

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

Latest: As the last time I went out, coming back everything ran great so I went back out to try to recreate the problems. Sure enough, push it up over 3500 (this time) and alarm and reduction mode. I pulled off the cover to check out the side oil tank and it was about 1" below the max fill line. Headed back in and the alarm went off again at around 2000rpm, over rev's (spikes) up to around 5200, 3800 - all over the place . Pulled the cover off again and the side tank was full to fill line. Had a nice stream from the the "pee" line, put my hand under it and the water was barely even warm. (so I don't think it was an overheating problem)

While the cowling cover was off, I noticed the fuel filter water ring was floating a bit indicating water in the fuel. I dutifully check my racor filter bowls and drain any sediment/water before any trip. But I don't pull the covers off before leaving as a matter of course. I drained the fuel bowl. Do i need to change the filter because of the water.

Also, would water in the fuel cause the symptoms I am having with the over rev'ing and protect mode?

 

[yamamarinetech40]

Re: Yam SWSII 250 (Hey Rodbolt)

No, back then there was no water in fuel sensor or alarm(there is now and on HPDI there has been). When you get the alarm, are any of the bars flashing on gauges?

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

Good question. I do not believe there are any other flashing indicators. The tach displays the rpm's jumping all over the place before reduction mode but I don't think the oil indicator (triangle carot) comes on. It may be, but I don't recall seeing anything else on the display when it last happened.

 

[cousinabe]

Re: Yam SWSII 250 (Hey Rodbolt)

FYI, I was investigating a similar problem for my friends 1999 200 OX66's towards the end of the season, we did not get a chance to perform all the tests that were recommended.
here is the link to the thread:
http://forums.iboats.com/bbBoard.cgi?a=viewthread;fid=30;gtid=1130932;gpid=1210613

I plan on revisiting the batteries and their connections and the oil strainer/filter for restrictions.
His symtoms were very intermittent as well.

 

[cousinabe]

Re: Yam SWSII 250 (Hey Rodbolt)

could this be a solution?

forums.iboats.com/bbBoard.cgi?a=viewthread;fid=30;gtid=1169610

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

The link is coming up error? can you try again?

 

[cousinabe]

Re: Yam SWSII 250 (Hey Rodbolt)

http://forums.iboats.com/bbBoard.cgi?a=viewthread;fid=30;gtid=1169610

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

Ok. Sounds interesting and very much like my problem symptoms. However, when I have gotten an alarm, I have pulled off the cowling cover and the side tank is pretty much been full. Once it was about 1" down but well between the lines and refilled in short order. Having said that, I would assume I do not have a flow blockage issue.

I am interested in following-up on the water "trap" but couldn't find it in the service manual. Where do I find it? Also, were is there a filter on the side/remote tanks? Seems reasonable that if I don't know where they are, they haven't been changed and probably could use it.
Nes

 

[cousinabe]

Re: Yam SWSII 250 (Hey Rodbolt)

Just some thoughts.
When you get the alarm and pulled off the cover, maybe the remote oil tank pump has had a chance to fill the engine oil tank. maybe try running with the cowl off and observe the engine oil tank level.
on www.boats.net, choose the oil tank diagram.
http://www.boats.net/parts/search.h...TXRA&Component=106048||620302610009||OIL+TANK

The water trap is the nipple on the bottom of the engine oil tank.
The oil filter is the strainer #22 on the diagram. I'm assuming that can be taken out and cleaned with solvent to remove any sludge. Also may want to check/clean your oil tank.

 

[nestor]

Re: Yam SWSII 250 (Hey Rodbolt)

Ok. Using the winky , I show a 33 code on start-up (ignit timing adjustment) then once it warms up and idle drops to 7-800, just the single "normal" code. I let it run for about 20 mins and no change in the code. any thoughts?

 

[rodbolt]

Re: Yam SWSII 250 (Hey Rodbolt)

many thoughts
first is to tellme what the visual idicate is telling ya.is it overheat or oil?
code 33 is normalwarm up, code 1 is allis ok.
run it up to the problem area with mr winky installed and see what it says with the horn sounding.
be aware that normal oil transfer WILL NOT occur with the winky installed, however manual transfer and allalarms will function normally.