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Exhaust Running hot
Seabee 
 		  Port: Monroe   07/22/2008 20:43
Brown
Posts: 47
 

My Starboard engine exhaust has been running hot all year, I rebuiled the sherwood raw water pump, and is pumping a good amount of water out the exhaust out the transom, I flushed tranny cooler, pulled manifold risers and cleaned very little out of them all I changed at the begining of the year is my spark plugs, Note the main engine temp is fine, just they exhaust is real steamy, has me baffled any hepl would be great. Engine is a 302 Pleasurecraft.
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Re:Exhaust Running hot
hondacat 
 		    07/24/2008 08:11
Moderator
Posts: 664
 

Did you loose any fins off of the old water pump impeller? If so look for them in the thermostat housing they might be in there plugging the little by pass holes
This is why it’s so important to change water pump impellers before they fail they can send these little rubber parts into the cooling system causing a multitude of different hard to find cooling problems
The thermostat housing diverts water away from main engine cooling duties to the exhaust manifolds the problem is here or there is a restriction in the exhaust manifold it self not allowing enough flow to carry off heat from that side
Good luck let us know how it turns out
Also a good tool to figure out what’s going on with a cooling system is to temporarily install some clear tigon hose where the black rubber hoses are . this will allow you to LOOK and see what’s going on in the cooling system . There should be the same flow to both manifolds and no air bubbles
Clear hose is readily available at most ace hardware stores

last weeks catch
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