View Full Version : Black smoke low RPMbs

02-22-2010, 10:34 AM
"Pair of 315HP Yanmar, one fuel tank, clean bottom, new Racor, cleaned Turbo's with Turbo Wash, No smoke @ the dock, with load props spinning @ 2100 the heavy black smoke starts, RPM's will not go over 2600. Startboard is perfect. Fuel is four mths old, treated. Any idea's?"

02-23-2010, 04:59 PM
"I have the same problem with the same Yanmar's on a Carolina Classic 28. Ran it for 8 hours Sunday trying to clean it up, one motor @ 2400-2600 rpms (bad black smoke) & the good one @ 3100 rpms (no smoke just steam). If I figure it out I will post you.
Hope you find an easy solution as well.
SeaYa: 2xstream"

03-01-2010, 03:44 PM
"My Problem Solved: New fuel and changed the Yanmar & Racor Filters again.Also cleaned the Turbo sreen filter. She ran fine; 36kts @ 3900 rpm's.
Good luck, If this doesn't work check the Waste Gate Flapper on the Turbine to see if its stuck."