Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 08-01-2007, 12:59   #1
Registered User
s/vAngel's Avatar

Join Date: Dec 2005
Location: Florida
Boat: Bayfield29, 31loa bowsprit
Posts: 61
Varying RPM, bad governor?

Hello there again. Has anyone ever had to tinker with their inboard diesel's governor? I'm wondering because I have no idea what other part in my engine to place the blame... Last year, when crossing the Gulf Stream, the wind died and I motored. After a few hours, Angel's elderly 3-cyl, 20hp Perkins suddenly started "hunting", its RPM jumping up and down. I eased the throttle and it put her in neutral and it stopped hunting. I throttled back up and seemed to hit a flat spot where she'd hunt and then past that flat spot, it ran fine again. After that incident, once and a while, her RPM will hunt around for a moment or the engine, near the governor's location, will make a brief rattling sound.
Everything else seems to check out, can't find air leak in fuel, just changed the water pump">raw water pump and oil. filters are clean. Fuel, though from a foreign ports, is clean. all cylinders seem to be firing okay and sound well. Powers up okay, but with that flat spot. exhaust is a bit stinky (the foreign fuel?) and slightly white smoke at higher speeds. I've met two other cruisers who have Perkins and had to repair their governors, but I'm not expert enough to diagnose this personally. I know that I do have a mechanical type gov. with that whirlygig thinghy and a spring. There's probably a doo-dad in there as well. Am I missing some other problem or should I just dig in and change the sucker? Better yet, call in an expert!
Thanks in advance for any input. It's mystery motor theater, 2007.
s/vAngel is offline   Reply With Quote
Old 08-01-2007, 14:05   #2
Senior Cruiser
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
Sounds like the IP govoner. It's not something you can easily do yourself. The pump needs to be pulled and sent away for a repair.

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 08-01-2007, 14:25   #3
Registered User
Sunspot Baby's Avatar

Join Date: May 2003
Location: New Bern, NC
Boat: Prout Manta 38' Catamaran - Sunspot Baby
Posts: 1,521
Images: 14
There are other possible causes. Even if the governor is trying to maintain a steady RPM, if there is trouble with the fuel supply, it is fighting a losing battle. Lift pump, injector pump(s), fuel line, etc. can exhibit intermittent problems. IMHO the first thing to do every time is have the injectors checked. From there, check that you have correct pressure or vacuum at each stage of the system before you tear into the governor.

She took my address and my name
Put my credit to shame
Sunspot Baby, sure had a real good time
Bob Seger
Sunspot Baby is offline   Reply With Quote


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
Yanmar Tips GordMay Engines and Propulsion Systems 18 29-07-2012 05:04
White hull + Used motor oil = Bad Stain! ssullivan Construction, Maintenance & Refit 7 31-08-2006 21:05
How to check for a bad battery KevinE Electrical: Batteries, Generators & Solar 13 08-08-2006 12:23

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 21:17.

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.