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ok guys, sorry for the delay , so went through all of the records from the repair shop over the last several years.. the long block was repaired but it doesn't say whether it was cracked, they changed the risers and exhaust, but did not change the manifolds...... anyway so the mechanic has been...

this is exactly how im feeling right now.. checked and replaced the t stat, impeller, circulating pump, tstat, water strained and both water distribution housing and no closer to answers.. the engine serial number is ow396235.. for the other question the block was cracked a year ago an the went...

sigh .. they replaced both water distribution housings, also replaced the sea strainer (they found a crack while backflushing engine) ... and the overheating problem is still there !!! ... getting very discouraged..

ok guys so I had the mechanic come take a second look he ran a compression test... everything was good... after a couple hours of searching found that the water distribution housing was bad.. apparently the valve was stuck... will replace in the next couple of days on both engines...

Well ill looks like you were right.., I changed the pump... Overheating persists... Sigh .. I'm not sure where to go from here ... Pretty bummed..

Actually im in saltwater .. How long do manifolds last in saltwater ..? Also the mechanic told me I should be flushing the engine with freshwater EVERY time I take her out.... Haven't been doing that ... Do you just close the sea cock , drain the engine ,mand put a water hose in the flush...

Well I had a mechanic come take a look... Started the engine and took a look at the circulating pump and could here the bearings and see water dripping ... So he thinks it's definitely a circulating pump.... So YOU GUYS WERE RIGHT ! ... He was going to change it but I told him im going order the...

Yea definetly not running the engine except to check the temp and shut it down at 170... I was wondering how hot the manifolds could get... I just checked the records and the manifolds and riser were replaced in 2011 ...what would a blown head gasket look like ? Could that be the reason. My...

Well I guess my question is ..since it seems the same amount of water is coming up the exhaust on both engines (let's just assume it's true) .... And the impeller and sea water pump is in good condition ... If the water circulation pump failed or was weak.... Would the sea water pump be enough...

I dont have have a closed cooling system . I don't have coolant or heat exchanger . Engine is sea water cooled . Which is in part why I am confused about how the sea water pump and circulator pump interact. Which one does the bulk of the pumping. If the circulating pump failed would the sea...

I will ill check the pump after I check all the hoses I have always wondered about how the water circulating pump and the sea water pump interact ? I've which one does the bulk of the pumping ? Does the sea water pump function to pump water up to the circulating pump and then the...

ok guys thanks for ll the helpful posts,, ill answer each one I can remember so the sea strainer is clean, seacock is open (I got the stuck seacock open last summer with some pb blaster)(other overheat issue was related to a loose hose) the boat is in the water so inspecting the water...

Water seams to be coming out of the exhaust equally... I'm guessing if the raw water pump was weak I would see less water out the exhaust ? ..strainers clean..boat hasn't been to the water in a year...

ok so I finally got around to checking the impeller.. It was in good condition .... Then I changed out the thermometer and cleaned the t stat housing .. Had a little gunk but not to bad .... still having the same issue .. Slow and steady overheat... The engine continues to start fine ... any...

The first time happened on plane .. Shut the engine down pretty quick and returned to the dock on the starboard... Started again during docking and by that time it cooled.... Ran it again on idle just to check to see if it was a thermometer issue and it gradually overheated after around 10-15...

I don't have a heat exchanger /antifreeze/closed system ... both from the engine manual ...and tracing the water flow in the engine.... no heat exchanger.. unless i am completely missing something

Ok will pull the impeller this weekend .. I am salt water cooled by the way if there are veins missing where do they usually get stuck at ? (Ie what's the smallest diameter tubing or inlet area ) what parts are particular vulnerable to get clogged ? I heard you can back flush the parts...

so the starting problem is seemingly gone and only happened once, after that the overheating issues started I figured the problems were connected,.. but your right may be a red hearing the Engine was rebuilt 1 year ago during the buying process.. but not sure if they replaced the manifold and...

checked the oil and it wasn't milky... oil was slightly overfilled,...... will change the oil anyway ,,, any other causes? trying to connect the engine not starting ... and then starting a week later but overheating...doesn't seem like it would be a cooling issue..

That's a good idea.. What's the best way to do that ? Take some oil and see if it seperates ? .. If there is water in the oil is there anything special I need to do when changing the oil ? (Might just do that anyway )