Port engine overheating at inboard exhaust elbow

No need to haul the boat out for this. I've used the shop vac method before and it works great. Blow air through the strainer as mentioned above or take the hose off the sea-cock and blow air through the sea-cock with your shop-vac. Once you hear the water bubbling under the boat, you are good to go.
 
Update:

The shop vac method seems to work which is why I was racking my brains trying to figure out where the clog was. Turns out, that seagrass(?) I pulled out was dense enough to clog the intake but would let air from the shop vac pass through. I was getting some water from the intake, just not enough.

Diving under the boat, I was able to remove two big clumps of that stuff from the outside of the intake. It was stuck in the grates pretty good.

I used horsepower to remove the rest. Fired up the boat for about a minute, shut it down, then removed that clump it the photo from the strainer.

I removed poked a dow rod around the seacock last night and it seems clear.

Problem now is the port side water pressure reads higher than starboard. Port gets up to about 15-18psi at 3500 RPM at the dock, Starboard stays at 1bout 10-12.

Today I am going out to test it under load. Everything seems normal at low speed so I will be curious to see what happens when I try to go up on plane.

Thanks everyone for your help. This has certainly been a learning experience!
 
once you get up on plane hopefully should clear it out
 
Ran her on plane for about an hour. Pressure at 3700rpm is about 16.4 psi starboard, 20.5 psi port. Temps below 175. Port runs a little hotter at the gauge but exhaust elbows “feel” similar in temp.

I never read water PSI before. Are those normal and is 4psi variance anything to worry about?
 
Southern Cross said:
Ran her on plane for about an hour. Pressure at 3700rpm is about 16.4 psi starboard, 20.5 psi port. Temps below 175. Port runs a little hotter at the gauge but exhaust elbows “feel” similar in temp.

I never read water PSI before. Are those normal and is 4psi variance anything to worry about?
Click to expand...
Im not sure about about your pressures what is the recommended thermostat for your motors.When you say your
below 175 where are they both exectly at
 
I think 220. The gauges go to 250. It is both closed cooling and raw water.

Temps are about 172-3 on the port, maybe a few degrees cooler on the starboard.
 
Last edited:
Good morning, the info i found is 160 degree thermostat for your motors. So I think you said earlier that your elbows
have never been changed so your long over do for that, Also exhaust manifolds have a life of about 12-15 years so your
coming up for that too. i think this might be the only thing left i can think of.

Good Luck
 
I almost hate to suggest it...but try swapping pumps? If the problem follows, you have your answer.
 
Our generator plugs off some times and once both main engines. Usually sea weed, jelly fish or man made material. To clean out I: Close sea valve, remove hose at strainer, connect hose from potable water (Have hose that just fits inside the main engine (Bigger hose) and generator hose (Smaller hose), clamp hose so inserted hose will not blow out, turn on tap and you can hear line and hull strainer clear. It some times takes 2 or 3 tries. Never had a block between the strainer and engine. Assume same method would work there. When there is lack of water there is a different sound.
 
Express 390 said:
Good morning, the info i found is 160 degree thermostat for your motors. So I think you said earlier that your elbows
have never been changed so your long over do for that, Also exhaust manifolds have a life of about 12-15 years so your
coming up for that too. i think this might be the only thing left i can think of.

Good Luck
Click to expand...

Thanks Les. I adjusted the smartcraft to read temp and the digital readout has them at 165p and 161s so I think that is in range. Manifolds and risers are on the list but since it is a freshwater boat with closed cooling it’s not the highest priority.

We ran about 6 hours this weekend and everything seems normal. The port engine still runs 4 degrees hotter and 4 higher PSI. I never tracked water psi before but the temps seem right where they were before.

Thanks everyone for your help trouble shooting!
 
Southern Cross said:
Thanks Les. I adjusted the smartcraft to read temp and the digital readout has them at 165p and 161s so I think that is in range. Manifolds and risers are on the list but since it is a freshwater boat with closed cooling it’s not the highest priority.

We ran about 6 hours this weekend and everything seems normal. The port engine still runs 4 degrees hotter and 4 higher PSI. I never tracked water psi before but the temps seem right where they were before.

Thanks everyone for your help trouble shooting!
Click to expand...
Sounds like your back in action 165 Temp is right there where you want it. That's great !
 
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