Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 22-08-2008, 10:13   #1
CF Adviser

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Wherever our boat is; Playa Zaragoza, Isla Margarita
Boat: 1994 Solaris Sunstream 40
Posts: 2,408
Starting problem with Yanmar 3GM30

One of the Yanmar 3GM30's on my boat had developed an electrical starting problem wherein the engine would not always (and eventually, would only rarely) start when the gear/throttle lever was in the neutral position. I had assumed that the contact switches on the controls were at fault, but even when they were bypassed the problem persisted. The factory starter button and ignition switch both worked and current was getting to the solenoid.

I replaced the solenoid only to find that there was no improvement. Eventually a search on a commercial diesel related site led to the solution: the wire on the standard Yanmar harness was of insufficient gauge and, due to the length (and likely some deterioration of ) the factory non-tinned wire, there was a drop over the path to the solenoid that meant that insufficient current was getting to the solenoid to engage the mechanical starter spline. Replacing the same with 8 gauge wire (the original was 12 guage) corrected the problem immediately.

Since the wiring was attached to the cable on the lead to the diesel, it seems that moving the lever would occasionally move or flex the wire into a postion that temporarilly corrected the problem. Now, even after re-connecting the neutral contact switches, it functions perfectly every time.

I am not sure whether anyone here has experienced a similar problem, although apparently it is not limited to the 3GM30.

Southern Star is offline   Reply With Quote

3gm, 3gm30, yanmar

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gallons / Hour with a Yanmar 3gm30 Dave in Eugene General Sailing Forum 32 18-01-2013 13:23
Yanmar 3gm30. Jacana Engines and Propulsion Systems 4 19-03-2008 09:14
3gm30 Yanmar full of hose water.... Dave in Eugene General Sailing Forum 14 12-02-2008 19:15
coolant water take off from Yanmar 3gm30 Dave in Eugene General Sailing Forum 6 31-12-2007 20:39
Hard Starting Yanmar 3GM30 sailcruz Engines and Propulsion Systems 2 15-05-2007 13:47

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:18.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.