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Old 06-09-2010, 02:02 PM
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cdevro cdevro is offline
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Boat: MasterCraft X2 350
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Blown motor 08X2 400 hours.

Last month my engine started knocking after a day on the water, no alarms, no warning signs. The 400 hour 350 MCX engine has been maintained at regular intervals.Orginally it was thought to be under warranty but in the end I paid the bill. The cheap plastic intake screen on the botom of the boat was broke from an unkown object. Weeds were allowed to pass right into the cooling system eventually clogging the transmission cooler and then overheating the motor. THe argument that I have is why wouldn't the temp sender be able to pick up on the high temp? (it was tested and found to be in working condition and no codes showed up on diagnostics of the engine) THe plastic screen has been replaced with the brass intake that is on most of MasterCraft boats. Why they went plastic is beyond me.
SO lessons learned:
1. clean and inspect transmission cooler screen periodically
2. fully inspect under boat each time you pull it out of the water. (I do this everytime ,but the trailer bunks block the view of the intake unless you really get under it.
3. If you have the plastic intake screen replace it !


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  #2  
Old 06-09-2010, 03:04 PM
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ttu ttu is offline
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wow, that is hard to believe.

i have a 07 x2 and i guess i need to start checking in plastic intake on the bottom of my boat.

sorry to hear about your problems.
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Old 06-09-2010, 03:33 PM
meg meg is offline
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wow that really stinks for you!!!! I have an 06 X30 and I think it has the brass screen but I perioically check the intake screen. What amazes me is your temp gauge did not increase-did they say why? Does your lake have alot of debris?
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Old 06-19-2010, 10:14 AM
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JimN JimN is offline
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Originally Posted by meg View Post
wow that really stinks for you!!!! I have an 06 X30 and I think it has the brass screen but I perioically check the intake screen. What amazes me is your temp gauge did not increase-did they say why? Does your lake have alot of debris?
It won't read high temperature because the sender is made to be immersed in water, which is a lot better at coupling the temperature to the sender. Hot air doesn't do it.
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Old 06-19-2010, 10:17 AM
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JimN JimN is offline
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EVERYBODY- read your owner's manual and post what it shows about cleaning the oil cooler and pre-boating check list. It used to recommend checking/cleaning the oil cooler before every outing. It also recommended checking the oil, hoses, etc. I don't know of anyone who bothers to spend the 5-10 minutes this takes, in order to avoid this kind of situation.
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Old 06-19-2010, 12:04 PM
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vision vision is offline
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Originally Posted by JimN View Post
It won't read high temperature because the sender is made to be immersed in water, which is a lot better at coupling the temperature to the sender. Hot air doesn't do it.
You would think that similar to newer cars, marine engines would by now have oil/block temp sensors as well as water temp sensors. It is one of the down sides I suspect of using engines designed in the 80s/90s.
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Old 06-19-2010, 12:26 PM
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JimN JimN is offline
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Originally Posted by vision View Post
You would think that similar to newer cars, marine engines would by now have oil/block temp sensors as well as water temp sensors. It is one of the down sides I suspect of using engines designed in the 80s/90s.
This is marine- there's no way as much money will be poured into R&D as they do with cars and trucks. Plus, the EPA isn't as far up a particular orifice, but they're trying.

An oil temp sensor could be added but when so many people ignore service intervals, can't access the data and think RPM reduction is "limp mode" when there's no water getting in to cool the motor, what's the point? My first post was to correct someone's recommendation that the warning buzzer wire be cut because it was annoying the boat owner. People regularly run the motor when it's running extremely roughly, which is usually RPM reduction and that's for getting out of danger, not limping back to the dock a few miles away. When it's in RPM reduction, shut it the eff off! There's one reason it goes into that mode on a MC boat and that's when it's overheated. Period!

The date of design means absolutely nothing. If there's no place to put an oil temp sender, they can add one. It's not much more than drilling/tapping a hole and threading it in, wiring it to the ECM and programming it to do something if it goes out of tolerance. The coolant temp temp sender IS the water sender but, even on a car, if the water jacket is dry, it's not going to show the real temperature until it's way too late.

Boats aren't cars and they suck all kinds of crap into the raw water cooling system. Boat owners need to accept the fact that some maintenance is required before taking the boat out. It's not like it needs to be torn down but a little inspection isn't hard to do. The problem is that so many people want a boat and want to be able to use it like they do when they drive away from home- "turn the key and go". Another part of the equation is that people no longer want to learn how to learn how to do mechanical things. They'd rather be an executive, lawyer, doctor, athlete or something else. Schools don't teach what's practical, they teach what will make the kids ready for colleges that will send them out as Captains of Industry, MBAs and members of Congress.
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Old 06-09-2010, 03:25 PM
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CruisinGA CruisinGA is offline
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I don't understand why you didn't get a temp alarm...

Those weeds caused the same problem as losing an impellar, and I know I got an alarm and "limp mode" when my impellar blew.
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  #9  
Old 06-09-2010, 03:32 PM
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ski_king ski_king is offline
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Originally Posted by cdevro View Post
............ THe argument that I have is why wouldn't the temp sender be able to pick up on the high temp?..............
The water temp sender wont see the high temp if there isnt a water flow. I have seen this happen before, but that was on an older boat.
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  #10  
Old 06-09-2010, 03:32 PM
bxroads bxroads is offline
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It's called an Intake Water Strainer




Last edited by bxroads; 06-09-2010 at 03:42 PM.
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08 x2, blown motor, engine, overheat, weeds

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