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Old 06-02-2014, 11:45 PM
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TommyV TommyV is offline
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Boat: Mastercraft X30 2001 330hp LTR
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2001 X30 330hp LTR overheating

Hi, I just took my 01 330hp LTR Mastercraft out on the lake for the first time, and the temp went uptoo 220, pushing 240. I shut it down and cooled it off, then drove got it back to the dock. it ran perfect all last summer no issues, i winterized it and now its running very hot, i just replaced the impeller, the old one looked fine though, i changed the thermostat, the old one was rusty, i thought maybe it stuck closed over the winter but when I hung it in hot water it moved, I put a new one in anyway, the old one was installed on top of the spacer block, does any one know if thats where it goes or does it install right at the block? i installed it the way it came out, on top of the spacer point facing up? I have a junction to connect a hose inline and ran it up again and it is still running hot so the gauge says 210 to 220. but lots of water coming out of the exhaust ports out back. I used a digital thermometer around the whole block its pretty steady around the top and thermostat housing at 143, down port side by the spark plugs it ranges 145 to 160 on the starboard side the thermometer is off the chart at 220 plus, could thyis be manifold? can anyone give me some insight please. the top of the exhausht elbows are at 97 to 100, not sure what to do know,
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  #2  
Old 06-03-2014, 11:31 AM
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jafo9 jafo9 is offline
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silly question, but did you watch the motor run? i've summarized and cranked in the driveway only to see water pouring out of a hose i forgot to reattach. also, when my raw water pump was failing, it leaked a fair amount of water out of the shaft area. i've also not tightened the housing on my thermostat enough and had water leaking out of the seal. it sounds like you have the t-stat installed correctly. it's a clamshell design and the t-stat sits in-between them. iirc, the pointy end is down. i guess a long shot may be if you have a heater and it is spewing water from a leaky core.

another area to look for water restriction is the bottom of the transmission cooler. i also just had my water circulation pump start to go bad. does it make any funny noises? that was the clue for me as the bushings were shot and the pump was making a clanking noise. i ran the boat with the belt off for a bit in the water to narrow down the noise. the pulley was also a little wiggly and not real smooth to turn.

i'm not sure how any of the above would make the port side cooler than the starboard. if you take out the drain plug on the starboard block does it spew water like when you winterized?

hopefully it will be a quick fix. good luck.
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  #3  
Old 06-03-2014, 01:14 PM
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TommyV TommyV is offline
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Boat: Mastercraft X30 2001 330hp LTR
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I did watch the motor run, I took it up to 2000 rpm and couldn't see any leaks, I have the thermostat with the point end up? I guess the next step is to check the transmission cooler, when i winterized I did not pull the drains, I just ran marine antifreeze through the system from the hose pickup until it came out the exhaust ports. I will pull the block drains and flush water through, I didn't notice the circ pump making noise but will watch it again, I do have a heater but don't know where the core is? I think the fan is behind a panel under the helm, so I'll check that out as well. I will try these and post my results, thanks for the help
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  #4  
Old 06-03-2014, 01:24 PM
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jafo9 jafo9 is offline
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your heater core is attached to the fan. mine is under the helm behind the panel the sub is installed in. usually the water runs out at the drivers feet if its bad. likely not your issue unless you have a puddle of water under the helm.
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  #5  
Old 06-03-2014, 01:42 PM
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TommyV TommyV is offline
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that will be where my heater core is, but no water around that area.
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  #6  
Old 06-03-2014, 03:49 PM
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ricford ricford is offline
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Don't know specifically about the LTR, but most if not all thermostats install with the point and spring down. Maybe someone else with specific knowledge about your engine will chime in.
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  #7  
Old 06-03-2014, 04:42 PM
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Rossterman Rossterman is offline
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Make sure raw water impeller is installed correctly. A few have used the narrower (1 7/8" vs 2") version by accident as they look and fit almost identically. A few have had the key fall out of the shaft during assembly, and a few have had the splined versions center delaminates from the rubber which all resulted in little or no cooling water flow.
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  #8  
Old 06-03-2014, 08:15 PM
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TommyV TommyV is offline
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Im just about to head out to the boat, I will take another look at the impeller, mine is the splined version. as well I install the thermostat on top of the spacer block point up. I will try to flip this as well. Thanks
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  #9  
Old 06-03-2014, 10:16 PM
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TommyV TommyV is offline
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Boat: Mastercraft X30 2001 330hp LTR
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okay took the new impeller out and compared it to the old one seems to be an exact match. dipped it in soapy water and reinstalled it, pulled the hose from the circ pump and ran water through pulled the plug on the starboard side and flushed water through for 10 min, water flowed good and steady out the hole. flipped the thermostat from point end up, to point end down, this thermostat has no spring. started up and ran for 10min right at 160 then inched its way back up to 220, put my hand on the raw water pump and inlet hose, both are cold as the water going in, speed up the motor but this did not cool it down, again lots of water coming out the exhaust, and the water is cold, i thought it would be hot? not sure what to do Know? circ pump is not squealing or leaking from the hole, as Im using the hose connector i have no shut off valve for the through hull water runs out of it but doesnt look like im sucking air, plus this happened in the lake originally,
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  #10  
Old 06-03-2014, 10:25 PM
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Clack Clack is offline
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There are two water pumps, the raw water impeller feeds water to the engine and the regular water pump circulates it through the engine. This second pump is belt driven (not off the crank) where you'd find the normal water pump on a truck. 95.9453% sure that's what you need to replace. Then double check you've got the thermostat in right side up.
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