View Single Post
  #5   IP: 104.174.83.118
Old 09-14-2022, 07:06 PM
ndutton's Avatar
ndutton ndutton is offline
Afourian MVP
 
Join Date: May 2009
Location: Torrance, CA
Posts: 9,619
Thanks: 198
Thanked 2,208 Times in 1,425 Posts
Most marine engines, gas or diesel, have cooling systems that function much like our Atomic 4. That is, restrict the coolant flow through the block when cold but at the same time bypass it to the exhaust hot pipe by way of a dual action thermostat. This system provides critical full flow to the exhaust at all times.

I recently converted a Yanmar 1GM from RWC to FWC and in the design phase the original bypass with dual action thermostat was obvious. You should check yours carefully to see if it is the same type of system. If it is, it suggests to me the blockage is right before or at the exhaust injection point.
__________________
Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Reply With Quote