engine mounted raw water pump with alpha drive

Tominator88

Seaman Apprentice
Joined
May 10, 2023
Messages
38
hello all i have a 5.7 vortec full closed cooling with raw water pump in engine i have an alpha one drive the instructions ive found when installing this engine setup say to cap the water inlet on top if intermediate housing and to leave the pump in alpha to cool the drive. as much of a pain it is to change 2 impellers im ok with this setup. except how does the water flow if it is capped has anybody rerouted? this water libe to create a drive shower or reroute it through exaust
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,324
hello all i have a 5.7 vortec full closed cooling with raw water pump in engine i have an alpha one drive the instructions ive found when installing this engine setup say to cap the water inlet on top if intermediate housing and to leave the pump in alpha to cool the drive. as much of a pain it is to change 2 impellers im ok with this setup. except how does the water flow if it is capped has anybody rerouted? this water libe to create a drive shower or reroute it through exaust
Ayuh,...... You cap-off the transom so you don't flood the boat, 'n cut the hose outside, 'n let the water flow freely,....
 

kenny nunez

Captain
Joined
Jun 20, 2017
Messages
3,471
Mercruiser recommends connecting the drive supply water to the incoming supply from the thru-hull fitting via a “Y” connectIon along with a valve inside the hull. With this arrangement the engine can be ran with a common flush out.
 
Top