Hi,
After completely going through this engine, bored/rebuilt, pretty much everything got cleaned, new gaskets, thermostats, anything one might reasonably replace I did - seemed to be tip top and I got it mounted on the boat.
Today, with all the gauges/controls hooked up I started it on the flush. After 5 minutes or so I could see the starboard (higher) head was running a little warmer (have a temp gauge in each head), very shortly after I got an overheat alarm .. Disconnecting the sensor on that side showed it was the starboard sensor.
The water pressure was about 8 PSI on the flush in the 1000 RPM range. It was pumping water - from day 1 I never felt this thing has a really strong stream but pumps steady.
During the overheat I could put my hand on the head for a couple seconds - not stupid hot or obviously overheating but from the temp gauges (which are dummy gauges) I could see that head was indeed like 3/16 inch hotter on the scale. So I can't really say for sure it was overheating but I know from the gauges it was running hotter.
Sensors I would normally just swap but I'm worried the water jacket bolt that holds the retainer is going to snap..
Anyone have a trouble-shooting strategy for this?
Was thinking #1 check the water pump since this engine now has about 1.5 hours of running on the flush, potentially at some point a flush wasn't seated well and I managed to burn up the pump; #2 try to swap the sensors, maybe just cut the retainer to avoid breaking bolts; #3 maybe this engine is one that just doesn't like to run on the flush - this is the first time I ran it for long with the cover on, try it actually on the water? #4 pull heads and/or t-stats and start hunting?
My book (seloc) provides no clue what to do with this sort of thing.
Thanks in advance.
Jon
After completely going through this engine, bored/rebuilt, pretty much everything got cleaned, new gaskets, thermostats, anything one might reasonably replace I did - seemed to be tip top and I got it mounted on the boat.
Today, with all the gauges/controls hooked up I started it on the flush. After 5 minutes or so I could see the starboard (higher) head was running a little warmer (have a temp gauge in each head), very shortly after I got an overheat alarm .. Disconnecting the sensor on that side showed it was the starboard sensor.
The water pressure was about 8 PSI on the flush in the 1000 RPM range. It was pumping water - from day 1 I never felt this thing has a really strong stream but pumps steady.
During the overheat I could put my hand on the head for a couple seconds - not stupid hot or obviously overheating but from the temp gauges (which are dummy gauges) I could see that head was indeed like 3/16 inch hotter on the scale. So I can't really say for sure it was overheating but I know from the gauges it was running hotter.
Sensors I would normally just swap but I'm worried the water jacket bolt that holds the retainer is going to snap..
Anyone have a trouble-shooting strategy for this?
Was thinking #1 check the water pump since this engine now has about 1.5 hours of running on the flush, potentially at some point a flush wasn't seated well and I managed to burn up the pump; #2 try to swap the sensors, maybe just cut the retainer to avoid breaking bolts; #3 maybe this engine is one that just doesn't like to run on the flush - this is the first time I ran it for long with the cover on, try it actually on the water? #4 pull heads and/or t-stats and start hunting?
My book (seloc) provides no clue what to do with this sort of thing.
Thanks in advance.
Jon