Catalina 30 Engine Smoke and No Throttle Control

Jun 9, 2024
4
Catalina Catalina 30 Tall Rig Larchmont
Yesterday we sailed our 1984 Catalina 30 from her Larchmont mooring to the Mamaroneck marina for wintering. It's a short trip and we had fair winds most of way. When we entered the marina harbor channel, the wind died and so decided to flake the sail and motor in. That's when the trouble started. There was an excess of grey exhaust coming out the back and an engine alarm sounded. The motor continued to chug along, but the grey exhaust persisted. After ten minutes the throttle would not stay in position and the revs declined. Thankfully, we limped in to the marina, but throttle control was nearly gone.
Any thoughts on what might be the problem? She's forty years old and if Yanmar motor / transmission repairs are costly, I might just be done with the boat. We bought her two years ago from a friend as our introduction to sailing. On the plus side, she sails beautifully. On the debit side, we have no idea what might fail next.
 
May 1, 2011
4,586
Pearson 37 Lusby MD
My first guess would be to check the mixing elbow. Was there a black sheen on the water? What specific engine alarm sounded?
 
Sep 25, 2008
7,221
Alden 50 Sarasota, Florida
There are two ways questions like this typically go-

well-meaning people will offer guesses based on the (lack of) info you provide, or

better to provide more info which could narrow down the problem.

Age and history of maintenance of elbow as already stated. Other considerations -
integrity of throttle linkage, maintenance of injectors, cleanliness of fuel, condition of fuel filters, air filter clogged(if one exists), etc…