1970 Glastron 140 HP 181ci 4cyl s/n2676880.<br />After pulling the boat out of storage (2yrs) and performing a tune up the boat was running great, 
until put it on the water. At any speed the motor will overheat, the higher the RPM's the faster the temp rises. <br />At the end of every season I have always warmed up the motor then drained the intake/exhaust manifold, elbow, T-stat housing, and block. Then using compressed air blew out any remaining water and let the heat from the motor evaporate the rest. <br />Getting back to the problem, With the boat in the lake I removed the hose coming from the lower unit to check water flow (did not have any until I rev'd the motor up to 2000rpm)after that it would flow at all rpm's. With the hose laying horizontal at idle the water would make a 4" arc to the floor of the boat and at 2000rpm approx. 8"-10" arc. After reinstalling the fresh water hose to T-stat housing, I removed the drain plugs on the intake/exhaust manifold and elbow, the only thing coming out was exhaust. Concerned I pulled the hose coming from the front of the manifold to T-stat housing and also had exhaust. Is this normal ? <br /> <br /> http://www.mercruiserparts.biz/partsimages/CRUISER/68573/14.gif <br /><br />I have read about the exhaust flapper, Does anyone know if this motor has one since the exhaust exits through the prop. I removed the "ball check valve" many years ago and never had any problems, also cannot find it in any parts list. <br />One last thought could the exhaust be preventing the fresh water from entering? <br /><br />Any and all help will be appreciated.
until put it on the water. At any speed the motor will overheat, the higher the RPM's the faster the temp rises. <br />At the end of every season I have always warmed up the motor then drained the intake/exhaust manifold, elbow, T-stat housing, and block. Then using compressed air blew out any remaining water and let the heat from the motor evaporate the rest. <br />Getting back to the problem, With the boat in the lake I removed the hose coming from the lower unit to check water flow (did not have any until I rev'd the motor up to 2000rpm)after that it would flow at all rpm's. With the hose laying horizontal at idle the water would make a 4" arc to the floor of the boat and at 2000rpm approx. 8"-10" arc. After reinstalling the fresh water hose to T-stat housing, I removed the drain plugs on the intake/exhaust manifold and elbow, the only thing coming out was exhaust. Concerned I pulled the hose coming from the front of the manifold to T-stat housing and also had exhaust. Is this normal ? <br /> <br /> http://www.mercruiserparts.biz/partsimages/CRUISER/68573/14.gif <br /><br />I have read about the exhaust flapper, Does anyone know if this motor has one since the exhaust exits through the prop. I removed the "ball check valve" many years ago and never had any problems, also cannot find it in any parts list. <br />One last thought could the exhaust be preventing the fresh water from entering? <br /><br />Any and all help will be appreciated.