04 SANTE Overheated Need advice please

[Rob04]

Last weekend I was at a local lake. Daughter was putting on her wetsuit to go surfing and when we started pulling her, the engine started to miss, and the message on the display said engine hot contact dealer.

I did some troubleshooting on the lake and fianlly decided to idle in to the dock. got about half way and shut the engine down to cool. it stopped fine(no knocking). when i wen to restart it after 30 min it acted like the battery was dead. we got toed in. this is the 5.7 PCM motor

At home I puled the impeller and it was burnt on one end and chewed to ****. Ordered a new one. and put Bat on charge.

This weekend I went to replace the impeller. I wanted to make sure the direction to orient the fins so I turned the engine over without the serpintine belt. when it turned over it went around the i heard a metalic (clunk) sound like something was in the motor. a couple questions below.

1) Is there any reason turning the engine would not turn over smooth without the serpintine belt?
2) my guess is I seized something any probable scenarios. (My dealer can not get me in until Nov 3).
3) Is there any real reason I can not take it to another shop than a nautique dealer?
4) Any good recommendations on where to get a short block(or long block if needed)

Thanks
Rob

[Paxdad]

Once you heard the clunk did you keep turning the motor over? There is nothing that can go wrong with turning the motor over with the serpentine belt off. I would pull all spark plugs and make sure you did not experience a hydro- lock condition. When pulling out the plugs inspect for water on the plug and or draining out of the cylinder. Reply back for next steps if this occurred and if it did I would spray each cylinder liberally with WD-40 and turn over with starter before any other steps. Just to make it clear. Remove all spark plugs and spray cylinders down with WD-40 then turn over the motor with plugs out. You can also turn the motor over with a large ratchet and socket on the crank pulley bolt if the starter is messed up. The quicker you check this out the better off you will be if you have water sitting in the cylinders.

[Rob04]

Hi Paxdad, I had tried maybe 3 or 4 time to turn it over. That being said. I just pulled the plugs. Sure as **** water poured out of the second cylindar on the port side. the starboard plugs seemed damp but no water poured out. I turned the engine over without plugs (using the starter) and it turns over clean. I then sprayes a bunch of WD40 into the cyliders and turned it over again to move it around. Guessing I need new head gaskets? what is the next step?

Thanks a ton, Rob

[Paxdad]

Rob,
Continue to turn over the motor with the plugs out until you don't see/ feel any further visible signs of the WD-40 being compressed out of each cylinder. Be careful that you do not overheat the starter while performing this step. Then put the plugs back in and wires on. At this point you can try and start the motor and listen for any knocking sounds. The serpentine belt does not have to be on but recommend you put it back on. Only run it for a few seconds if you have no water through the engine. If no funny noises proceed with replacing the serpentine belt and impeller. I would also check the oil for signs of moisture which will appear milky but really doubt there will be any.

If your impeller was really shredded I would pull the thermostat housing and really look close for impeller parts as well as back flush the transmission cooler. Once you verify there are no residual impeller parts in the water system put in a new impeller. Don't worry about vane orientation as it will self orient itself and if you coat it with dish soap it will act as a good lubricant on initial start. One word of advise do not use an aftermarket or Chinese impeller. The PCM impeller will be in a plastic wrapped PCM package not a small white box.

Once you have done all the above and everything checks out fine (no noises, good oil pressure, etc.) take it to the lake and run it or run it on a hose at home checking for the previously mentioned items. If everything is good change the oil and eventually the spark plugs and you will be fine.

Let us know how it goes.
Reid.

[Rob04]

Hi Reid.

Thank you so much for the help.(I am hoping to get out on the water Sunday) That being said. I am traveling the next few days so I called a local marine shop and asked them to flush the cooling loop, install the new impeller and change the oil. he said 3 hours of work. (prob a waste of money but I ran out of time) he is also the going to check the compression for me just to be safe. Other than potential rod damage from the hydro lock I don't think I did any gasket or head damage. my reason is below.

Last night at 3am I actually remembered (think i know) know how the water got into the cylinders. when I shut it off to cool. I had the read deck lid open, we were hanging out and I notices the 2 big exhaust hoses were actually starting to collapse and tilting the water box forward. I thought it was odd. I reached down to the exhaust flap under the water and it was perfectly sealed. I pried it open with my finger and water rushed in at that time (In the heat of the moment I thought it was a good idea to partially cool the system). that is probably when it sucked into the cylinders.

I'll let you know what the outcome is.

Cheers Rob

[Paxdad]

Rob,
More than likely the water entered when the impeller went bad which caused the overheat to occur. The water that was sucked into the cylinders was already in the exhaust and when you turned off the hot motor it actually reversed or dieseled just slightly causing the water to suck back into the cylinder. Hopefully this all occurred while you were at idle speed. If so there really should not be any damage but, a compression check/ leak down test never hurts. I would also keep and eye on the exhaust hose as they are designed to collapse internally if subjected to extreme heat.