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  1. #1

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    2006 FX Cruiser HO possible blown headgasket

    Ran the ski for the first time today and it seemed to run great for ~1.5 hours then as I was idling the overheating alarm went off. I found one of the water hoses off and it was filling the hull with water. Luckily, I was about 100 ft from the dock. I have steam coming out port weep hole and exhaust. Need to check spark plugs and compression. Anything else?


  2. #2
    powerstroke specialist mikegp's Avatar
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    fix the hose and take back to the water, just don't go out , test it right on trailer. really doubt it has blown head gasket.

  3. #3

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    Tried running it on the hose and still overheated with steam coming out exhaust and port side weep hole

  4. #4
    There was a recall on the hoses and clamps for the 2006-2008 FX HO skis, because of leaking problems. Yamaha replaced the defective clamps and hoses for free regardless of the original owner a few years ago. I guess they may still do it??? I don't know if this is the problem or not, but worth checking into.

  5. #5

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    Now I am totally confused. I ran the ski on the hose again tonight. Steam started coming out of the exhaust and engine temp warning came on after about 6 minutes. I did a compression test expecting a low cylinder but all checked out at ~210 psi. I started to remove the hoses to see if I had a blockage and so far I have found nothing. After removing a checking several different hoses. I was cleaning up and realized that the water faucet at the house was not all the way open. Now, I am starting to wonder if I just didn't have enough flow this afternoon on the hose.

    Does anyone know if I can flush the engine block and exhaust manifold without risking damage to the engine? Where is the engine most likely to overfill with water and leak into the cylinders? (i.e. exhaust) Does anyone know the proper flow direction of the cooling water.

    I can see the water comes from the jet through the strainer into the hull on the port (left) side lower connection on the transom plate to a distribution block located under the engine. From there it seems to run up to the oil cooler and out of the oil cooler to the rubber exhaust elbow. Then the water continues to the 3 way distribution block. One hose goes to the engine block and the other two seem to go to the cyl. 1 and cyl. 4 exhaust manifold and the other runs to the cyl. 2 and cyl. 3 exhaust manifold. At some point water exits from the top of the exhaust manifolds near the heads and flows through a 4 way header back into the engine block. It then seems that the block fills with water up thru the head and thru the valve cover into a hose that runs to the thermostat housing. When the thermostat heats up to 140 F the thermostat opens and allows the water to flow out the transom thru a bulkhead on the inner starboard side of the transom. Then if there is back pressure enough the water flows up thru the thermostat housing out of the starboard side pisser. It also looks as if the outer exhaust jacket fills with water the water comes out of the rubber elbow in the exhaust manifold and flows out thru the port side pisser. There is also a port in the lower exhaust manifold before enter the water box. It seems as if the waterbox fills with water until the level reaches this port in the lower exhaust manifold and it drains thru the transom plate on the upper port (left) side.


    Any corrections or ideas are greatly appreciated.

    mdavidthomas

  6. #6
    powerstroke specialist mikegp's Avatar
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    on the water routing i have to look at the service manual. but if you want to flush the engine make sure you remove the water box . the only way the engine gets full of water is if it enters through the exhaust, in other words waterbox get fill and it works it way up into engine.
    and i told you, there not such thing as blown head gasket. 210 is right on.

  7. #7

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    Update: So here is the best I can figure out.

    1. Last Sunday, I ran ski for 1.5 hours on the intercoastal waterway in NC and the hose that goes into the block from the exhaust water manifold blew off the port or vibrated (bounced) off the port. Unsure how it came off but that caused the water flow to drop and the engine to start overheating. It also caused the hull to fill with about 4 inches of water while running.
    2. Took the ski to the beach house and ran on the garden hose and found the engine overheated again but found the hose that came off the upper engine block port. Replaced the hose onto the block.
    3. After putting the hose back on the block, I ran it on the hose a few minutes and seen steam coming out the exhaust and felt heat coming out the left hand side pisser. (Stopped working on ski and took back home)
    4. Wednesday, I ran ski on hose at home an it started overheating. Thinking the worst (i.e blown headgasket, cracked block, or blocked coolant passages), I removed the air box and throttle bodies, the thermostat housing and hoses to look for blockages. During that evening I had the water cooled hose manifold that comes off the exhaust manifolds on the top side and drains back into the engine block off checking for blockages. I hooked a hose up and noticed that very little water was coming out. So, I checked the garden hose and found that the splitter on the water spigot was almost turned off giving me very little hose.
    5. Saturday. Since I had the throttle bodies off, I removed the water box and flushed the engine on the hose. I pulled the hoses off the ports to make sure I had good flow and put every thing back together.
    6. Ran the engine on the garden hose making sure I had the spigot and splitter fully open and the ski ran for 15 - 20 minutes without overheating.

    So, the bottom line is "don't outsmart your common sense" and make sure you have full flow to the ski when running on the garden hose. Now, If I could just figure out why the hose came off in the first place and prevent it from happening again.


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    Thanks to all for their suggestions.

    mdavidthomas

  8. #8
    The hoses and clamps you have highlighted are exactly the ones that Yamaha replace in their recall, due to faulty clamps. If you have the old style clamps, then that is the explanation. I'd take it to a dealer and let them check it. It should be a free upgrade even on an older ski.

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