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Old 07-28-2015, 04:13 PM   #11
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Did some reading, you have the 3 point drain system. The hose that comes from the t-stat housing is the supply and the one to take the reading on. The other hose is for the drain system to winterize.
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Old 08-01-2015, 05:50 PM   #12
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Ok so I got to run the boat today. all was pretty good on the dock. Here are the temps after 10 mins idle.
Starboard engine
Starboard side. [port side)
Top of riser 87(83)
Top manifold 186(214)
Hose from thermostat 158 (150)
Top of thermostat 165
Top of oil filter 143
Gage reading at dash 180
Port engine
Starboard side. [port side)
Top of riser 88(87)
Top manifold 188(213)
Hose from thermostat 162(157)
Top of thermostat 169
Top of oil filter 147
Gage reading at dash 190

Problems started after running at 3500 rpm for 20 minutes. Alarm went off so we slowed down and these were the temps
Starboard engine
Starboard side. [port side)
Top of riser 89(92)
Top manifold 209(207)
Hose from thermostat 160(166)
Top of thermostat 170
Top of oil filter 143
Gage reading at dash 185

Port engine - after alarm
Starboard side. [port side)
Top of riser 230. (215) huge difference!
Top manifold 220(216$
Hose from thermostat 160. (165)
Top of thermostat 178
Top of oil filter 213
Gage reading at dash 210 Alarm
Brought it down to idle and the temps came down. Pulled into harbor at 2000 rpm and whe we anchored riser tops were back to 90

I am stumped !!!
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Old 08-01-2015, 07:59 PM   #13
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So while at anchor I climbed into the eng compartment and pulled one Jose off the fuel cooler and it was clear Also checked the check valve. Water ran out fast but I could not blow back through. Also double checked that the raw water pump hoses were not switched. Not sure what to check next! Anyone else have this issue?
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Old 08-01-2015, 10:27 PM   #14
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Almost all of your temps are to high IMO.

The hose from the t-stat is hot as it should be a mix of water leaving the engine plus cool water from the supply to the housing. No temps should be above 160 - 175 F.

I need to think about this some but both engine are too hot.

How old are the impellers? Have the exhaust been disassembled lately and inspected?
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Old 08-02-2015, 01:08 AM   #15
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Changed both impellers this spring and the port one again last weekend New manifolds and risers this spring. New thermostat last weekend. All new bellows and shift cables the past spring Stumped!!!
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Old 08-02-2015, 03:28 AM   #16
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When the bellows was done were the water house replaced? I have seen were these have clogged at the plastic retainer.
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Old 08-02-2015, 01:11 PM   #17
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I don't know. I has the shop do that. I will check with them. It is not noted on the invoice.
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Old 08-10-2015, 09:35 PM   #18
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Finally got back down to the boat, I talked to the shop and they said that they did not change the hose when they did the bellows. I did some more investigating, pulled the elbows, everything was fine, checked the flappers, also fine. pulled both port engine and starboard engine raw water intake hoses...big difference! the starboard was full heavy flow, the port war half that! Water intake must be the issue. I went to the service manager at my marina and he said he has had several engines with simmilar issues and the cause was some sort of seashell growing inside the outdrive water paths and restricting flow. the solution was to pull the boat, take off the out drive, split the outdrive and clean the paths, repaint with anti fouling paint, clean out the hoses form the outside and re-assemble. the cant do it until next week. I will post if it works! does this sound like the cause???
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Old 08-29-2015, 03:38 PM   #19
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Finally got it set...I think ........the marina pulled the boat to remove the outdrives. A shell of some sort has grown and attached to the inside of the water passage in the outlive. They removed it and put it back in the water. That engine still runs a little hotter, but no alarms! both the risers are cool at 3500 rpm so at least that was part of the solution. I will pull both drives over the winter and split them to make sure the passages are totally clear and also check the thru transom fitting to make sure there is no corrosion there. Should get me through the next couple months with no issues
Thanks for the ideas and thoughts
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Old 08-29-2015, 10:39 PM   #20
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Glad to here you have improved the cooling. Yes split the drives and check also the water hose on the transom assemblies clog so take a good look there.
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