"I have a '94 Sea Ray with
"I have a '94 Sea Ray with twin 7.4L Mercrusiers - I have had issues this past season with both engines heating up from 160(idle) up to 180(higher speeds)they cool back down after I slow down. When this happens there appears to be more than normal steam coming out of the exhaust. I changed the thermostats, impellers,oil coolers, risers/elbows. It is a closed system. I had to clean the intakes under the boat every other week due to growth.
I noticed that one engine, after sitting for a couple of weeks - when first started & just as water begins to come out the exhaust I noticed a small bit of coolant that comes out...for a second..just a splash. There appears to be a bit of steam that smell of collant for about a minute and than it goes away.
A few people have suggested that I either service the Heat Exchangers or replace - The thought is that the collant in the exchanger could be slowly leaking into the fresh water and out of the exhaust when that engine is started.
The engines run great & I do not have collant in the oil. I'm hoping that it is not a head problem.
Does the appearance of coolant upon start up sound like a possible Heat Exchanger problem? I purchase the boat 3 years ago - doubt that they have ever been serviced.
Any suggestions would be appreciated
Michael"
"I have a '94 Sea Ray with twin 7.4L Mercrusiers - I have had issues this past season with both engines heating up from 160(idle) up to 180(higher speeds)they cool back down after I slow down. When this happens there appears to be more than normal steam coming out of the exhaust. I changed the thermostats, impellers,oil coolers, risers/elbows. It is a closed system. I had to clean the intakes under the boat every other week due to growth.
I noticed that one engine, after sitting for a couple of weeks - when first started & just as water begins to come out the exhaust I noticed a small bit of coolant that comes out...for a second..just a splash. There appears to be a bit of steam that smell of collant for about a minute and than it goes away.
A few people have suggested that I either service the Heat Exchangers or replace - The thought is that the collant in the exchanger could be slowly leaking into the fresh water and out of the exhaust when that engine is started.
The engines run great & I do not have collant in the oil. I'm hoping that it is not a head problem.
Does the appearance of coolant upon start up sound like a possible Heat Exchanger problem? I purchase the boat 3 years ago - doubt that they have ever been serviced.
Any suggestions would be appreciated
Michael"