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Fav453

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Posts: 6
Reply with quote  #1 
E250DCXIID 2010 model year. (Twins the problem one is the port)
Problem I'm having is i got a high temp alert after running at cruise 4200 rpm for about 1/2 hour. The temp read 185 and I shut it down and let it cool and kept running about 20 minutes. Next time out same thing about 20 minutes on plane but this time it stayed up at 180+. Prior to the first issue I had a spun prop on this engine in May and it ran 20 degrees hotter since the spring. The other engine got a new water pump because I needed the gear case sealed however this engine's pump is 2 years old and low hours. I installed a water pressue gage and it is reading 12-13 psi at 4200 rpm a little low but not too bad. I will say the other motors telltale wsd noticeablely stronger, but i figured the leak mentioned later explained some of that.. They warm up the same but other engine's temps drop 20 degrees at cruise rpm.
So what have I done? I noticed the exhaust relief grommet was leaking inside the motor housing with hose cooling hooked up so i figure that was also leaking in operation, so I replaced that. At the same time I replaced the PRV with the new model from the service kit. I pulled and checked the thermostats and they looked good.
Ran the boat today and the temp crept right on up to 170 at idle then went to cruise 4200 and sort of just stayed there maybe dropped a couple of degress at first but sort of stayed at 170-172. I increased rpm to 4500-4600 and the temp went up to 175 and seemed headed 185+. I dont know what to do next except a new water pump but I don't know if that will help. What is weird is why doesn't the temp drop at speed (since I replaced the PRV and decent water pressure).

Do you think a new pump will fix this or should i be looking elsewhere?


PhilH12

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Posts: 3,499
Reply with quote  #2 
I would say the water pump first, but I'm no expert.  You see that it's running "a bit low" on pressure and that's often a sign of something wrong in there - blockages through the lines/passages/pickups or the pump itself.

Your new PRV would also suggest the pump, but also maybe check for aeration (clear hose test) in the coolant lines on a twin setup.  That may have shown up before now, but maybe with a weak pump it's worse?

Hope it helps!

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Fav453

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Posts: 6
Reply with quote  #3 
Thanks for the reply. I pulled the gear case and dropped it off at the shop figured they could do the seals and water pump while it's there. I will check the aeration with the clear tubing. What causes that condition?
PhilH12

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Posts: 3,499
Reply with quote  #4 
Frothy water into the pickups due to the "other" engine, transducers off the stern, engine height too high, etc, etc.  Air bubbles in the coolant lines won't 'cool' as well as solid water.

I'm still betting on the pump helping out, and the problem is showing itself now due to a bit weaker pump on that side.  You haven't recently added or changed any weight distribution have you?

Do let us know how it goes.

Phil

__________________
Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Fav453

Registered:
Posts: 6
Reply with quote  #5 
Can't say I've added anything off the transom in 10 years except the other side which was a different transducer 3+ years ago. The boat sometimes rides lower one side or other due to fuel distribution. Actually I put like 30-40 gallons more on the port side 200-300 lbs but the helm is on the starboard side so I balance it out. If I notice it running off balance I trim it out but haven't needed to do much. This is typical for 10 years.
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