eqquus1
Member
We own a 1998 37' Aft Cabin powered by 3116 cats non electronic. The issue is temperature fluctuation on the starboard engine when running at 2600 rpm. The stbd engine temp increases to 195. The port stays rock solid at 180. I changed the thermostat last year. The impeller for the raw water has been changed. The heat exchanger had the raw water side opened and I chased every tube with a brass rod that fits the diameter and length perfectly. The output of water through the side of the boat looks good. The engine has about 1000 hrs on it. Any thoughts?