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SX230 Resurrection

Brad_Ct

Jetboaters Lieutenant
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Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
Got thinking about the erratic voltages and it came to me that it could be a ground issue. I traced the black wire from the rectifier/regulator that I knew was a ground back to a 8 pin connector that had all black wires going into it and pulled the end of it, it turns out this a junction for all the grounds. Anyway the terminals were white like they had gotten wet, I cleaned with electrical cleaner put some dielectric grease on them put it back together and it started up.

Now I can get back to trying to figure out how I’m getting water in the oil.
 

Brad_Ct

Jetboaters Lieutenant
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Location
Alva, Fl.
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Yamaha
Year
2006
Boat Model
SX
Boat Length
23
@WREKS When you had issues with your cylinder head was the compression lower in that cylinder? I did a compression test yesterday and got the following readings, 146, 145, 145, and 152. I know they are low but this was with the engine cold, I would think if I had a blown head gasket or like in your case a eroded water jacket the compression would be significantly lower in that cylinder.
 

WREKS

Jet Boat Addict
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Location
Port Saint Lucie, Florida
Boat Make
Yamaha
Year
2007
Boat Model
SX
Boat Length
23
@Brad_Ct A leak down test may be a better way to determine where the problem is, especially if the leak/beach is small. It leaked down to 40 psi on Cylinder #1.
 

Brad_Ct

Jetboaters Lieutenant
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Location
Alva, Fl.
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Yamaha
Year
2006
Boat Model
SX
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23
Had a very productive day yesterday, I did a leak down test as @WREKS suggested and with a 90# test lost 12#, 7#, 7#, 2# in cylinders 1 - 4 past the rings as air was coming out the breather on the valve cover. Not great results but at least I know it’s not a head gasket and this engine was seized when I bought the boat so I’m honestly not surprised. Decided to pressure test the oil tank on the water side and discovered that when I introduced air it was coming out of the cylinders. I pulled the water box and pipe off to make sure it was not because of them and it made no difference so I pulled the other pipe off and found that #30 joint and #31 seal are destroyed and the sealing surface on the pipes are beyond being cleaned up.

Anyone have or know someone that has a exhaust system?

EA1390DF-E7F1-448E-BD14-AEAC9417E676.jpegDCE1BF1E-9D4D-4A3B-9F09-CED66FBAFF07.jpegE9D8D97D-1089-41A8-9E69-C71E6BD7603D.png
 
Last edited:

WREKS

Jet Boat Addict
Messages
660
Reaction score
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Location
Port Saint Lucie, Florida
Boat Make
Yamaha
Year
2007
Boat Model
SX
Boat Length
23
@Brad_Ct You said, "Decided to pressure test the oil tank on the water side and discovered that when I introduced air it was coming out of the cylinders." That points back to the head gasket. #30 joint and #31 seal are downstream from the milky oil problem. If air can get into the cylinders, water/steam can also.
 

Brad_Ct

Jetboaters Lieutenant
Messages
279
Reaction score
272
Points
167
Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
@Brad_Ct You said, "Decided to pressure test the oil tank on the water side and discovered that when I introduced air it was coming out of the cylinders." That points back to the head gasket. #30 joint and #31 seal are downstream from the milky oil problem. If air can get into the cylinders, water/steam can also.
There was no air pressure in the engine water jackets, the air that was going into the exhaust was from the outlet of the oil cooler and getting into the cylinders because of the bad seals. I’m not saying I don’t have other issues but this is definitely one.
 

WREKS

Jet Boat Addict
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Location
Port Saint Lucie, Florida
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Yamaha
Year
2007
Boat Model
SX
Boat Length
23
@Brad_Ct Can the stuff be filed off or has it corroded the metal. If it has corroded the metal, I would go with JB Weld after cleaning it up.
 

Brad_Ct

Jetboaters Lieutenant
Messages
279
Reaction score
272
Points
167
Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
@Brad_Ct Can the stuff be filed off or has it corroded the metal. If it has corroded the metal, I would go with JB Weld after cleaning it up.
I’m not sue how much metal will be left after cleaning the corrosion off and the sealing surface will definitely not be good. I searched on EBay and found I can get some fresh water parts fairly inexpensive so I think I am just going to go that route.
 

Brad_Ct

Jetboaters Lieutenant
Messages
279
Reaction score
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Points
167
Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
Parts came in Wednesday, 24 & 36 used off EBay from N. Dakota, 23, 30, & 31 new and installed them yesterday. Hooked my laptop up this morning and port engine shows 25.3 hours and starboard shows 14.5 so obviously both ECMs have been replaced which is a hugh bonus. Ran port engine for approximately 20 minutes on the hose watching the data and engine temp. came up to 192.x degrees so I have a issue with overheating but no water in the oil after running it so the issue was definitely the exhaust seals. Starboard engine that I replaced ran with no issues, I’m getting closer to getting this damn thing in the water after 2 years of working on it LOL.
1613774273265.png
 

Brad_Ct

Jetboaters Lieutenant
Messages
279
Reaction score
272
Points
167
Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
Yesterday I took the thermostat and pressure regulator assembly apart and they were both loaded with what I think is salt residue. While the cooling hoses were disconnected I blew air into the various lines and cleared quite a bit of the same substance. After putting everything back together I ran it on the hose for around 20 minutes and didn’t get any overheat alarms.

This morning I hooked my laptop up so I could monitor the engine temp. and ran the engine again for around 20 minutes and the temp. never got above 150 degrees then I flushed with salt away twice to try to clean the remainder of the crap out of the cooling system. I also removed the anode and the water jacket looks really clean at least in that area.

Still no water in the oil after running it for the last several days so I think I’m good there.
 

WREKS

Jet Boat Addict
Messages
660
Reaction score
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Location
Port Saint Lucie, Florida
Boat Make
Yamaha
Year
2007
Boat Model
SX
Boat Length
23
@Brad_Ct I think that substance may be a microbial buildup that feeds on the residual water left in the engine cooling system. It is the same stuff that can build up in AC condensate drain lines when they do not drain adequately. I have been trying to keep the engine cooling system dry by revving engine up and down for 15 seconds after shutting off hose water. That procedure is recommended in the owners manual.
 

Brad_Ct

Jetboaters Lieutenant
Messages
279
Reaction score
272
Points
167
Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
@Brad_Ct I think that substance may be a microbial buildup that feeds on the residual water left in the engine cooling system. It is the same stuff that can build up in AC condensate drain lines when they do not drain adequately. I have been trying to keep the engine cooling system dry by revving engine up and down for 15 seconds after shutting off hose water. That procedure is recommended in the owners manual.
I rev the engines every time before I shut them off, like I have stated before I really don’t know the history of this boat before I got it but it definitely was not taken care of properly.
 

Brad_Ct

Jetboaters Lieutenant
Messages
279
Reaction score
272
Points
167
Location
Alva, Fl.
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
Changed the oil twice in both engines yesterday just to make sure any residual crap was removed and I know there is nice clean oil in them.

I also had a long talk with @easyliving609 yesterday about the seat skins he sells and ordered a set from him. He joined the forum yesterday and from talking to him he is very knowledgeable about these boats in all areas.
 
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