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57 GSI cooling system problem

J

jhodges

New member
"I need Help! Just bought a 97

"I need Help! Just bought a 97' seaswirl stripper with a 5.7 GSI inboard and have had it on the water a few times with no engine/cooling system problems at all-ran perfectly and maintained around 180 degrees. After the last trip we decided to change the belts and after all the belts came off I noticed that the circulating water pump had lots of play- could move the pulley around a lot. Bought new factory pump and replaced on motor with new belts and when I tried the engine out after this, it overheats and the engine would die out if I gave it much gas at all- had to idle back to dock. Checked the sea water pump and impeller looks good. When I connect the water hose to the lower unit no water comes up to the sea water pump (tested with pump removed and hose laying in place). removed inlet hose to oil cooler and tried again with same result but when I spray water down from the oil cooler hose, it comes out of the lower unit. after I noticed the overheating problem, tried running engine with water hose attached and no cooling water was coming out of the exhaust hose. I don't understand what could have changed by just replacing the circ. pump. Any help would be greatly appreciated."
 
Pull your Top hose off of the

Pull your Top hose off of the sea water pump on the crank shaft and see if the pump is pumping water up to the thermastat housing. Do this test in the water as using a garden hose with the ear muffs forces water to the pump. Not like when it's in the water.
 
"Thanks for the suggestion. We

"Thanks for the suggestion. We tried that and no water came out of the sea water pump. What did work though was removing the hose from the oil cooler that goes to the pump and spraying water in at that point. When we tried this, the water was pumped through the engine and everything ran/sounded/flowed like it is supposed to. The oil cooler is not stopped up so we are assuming that something in the lower unit is not allowing the water to be pulled through. water will run out if back flushed but it almost seems like something is collapsing on itself when the pump tries to pull water up through it. or maybe a cracked hose/line somewhere. not really sure how to check out the unit from here."
 
It's "Air Locked"

It's "Air Locked" It happened to me 2 weeks ago at launch time. Once the air is removed it will pump ok. I have a engine flush connection on my engine that I pumped water into from my rear shower wand to prime the pump with.
 
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