SailNet Community banner
  • SailNet is a forum community dedicated to Sailing enthusiasts. Come join the discussion about sailing, modifications, classifieds, troubleshooting, repairs, reviews, maintenance, and more!

motor problems

1884 Views 13 Replies 8 Participants Last post by  endevour
i have 20 horse power yanmar 3GMF motor. in neutral i can get the rpms up to 3500-4000 if i wanted, however when i put it into gear the highest i can go is about 2000. when i go above that i get heavy black smoke from the aft thru hull. no smoke in cabin or engine compartment. is this an exhaust mainfold problem or maybe a saltwater cooling problem? thank you for any help you can give.
1 - 5 of 14 Posts
it overheated one time, ive trying to recreate the overheat but it hasnt happeened again.....i will check the prop though thank you
wow..jsl3 sounds like we had the same problem.....i scraped the bottom in june. looks like im going back down this weekend...what did you use to scrape..spackle knife? is there anything better......really would like to do this in the water
yea i scraped it twice this summer on its mooring the second time i really didnt get the prop though so...... we'll se tomorrow. thanks for the help
the problem was solved by cleaning the prop i havent looked up what tyhe original was but its working great right now
1 - 5 of 14 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.