Thread Tools Search this Thread Display Modes
Old 07-15-2017, 09:06 PM   #1
Senior Member
ak-guy's Avatar
City: Gustavus
Vessel Name: Troll Hunter
Vessel Model: Allweather
Join Date: Oct 2016
Posts: 152

I have a Yanmar 3HM, 3 cylinder, 27 hp. The engine runs fine, starts easily. The problem is that it stalls when the throttle is pulled back to idle rapidly, as when docking. If I ease the throttle back slowly it keeps running. After it stalls I can restart it immediately. The idle is set correctly at least as far as I can rely on my new tachometer. I have been through the fuel supply from the tank to the mechanical fuel pump, new hose, filter etc etc looking for air suction leaks. I have a section of clear tubing coming that I will put between the filter and pump to look for air bubbles, should have it in a couple days. I have also heard of putting the clear tubing in the return line?

The engine is new to me I have only a couple hours running time. I have heard that the three cylinder engines can vibrate at some engine speeds and this one certainly does that. At 1500 it has very noticeable vibration but smooths out at around 2000. I have done nothing with injectors.

ak-guy is offline   Reply With Quote
Old 07-15-2017, 09:11 PM   #2
Senior Member
City: Wherever the boat is
Vessel Name: Silver Quarter
Vessel Model: Bayliner 3870
Join Date: Sep 2016
Posts: 457
maybe try bumping up idle a bit, might be a crutch but better than being dead in the water while docking

kev_rm is offline   Reply With Quote
Old 07-15-2017, 09:42 PM   #3
Lepke's Avatar
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,328
Don't know the engine, but every diesel I've seen use a governor or a governor in the injector pump to control the engine speed. If the engine falls below idle and dies, the governor is at fault. It may be gummed up to a small degree. Probably from sitting or light use over time. Using a fuel additive that removes deposits might solve the problem. Better biocides usually have this in the mix. Try a triple dose.
Could be some of the vibration, too.
Lepke is online now   Reply With Quote
Old 07-16-2017, 02:29 AM   #4
City: Sydney
Join Date: Jul 2015
Posts: 1,646
Typical problem of Dirty injectors
gaston is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program

All times are GMT -5. The time now is 03:31 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012