Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-09-2015, 18:23   #1
Registered User

Join Date: Oct 2014
Posts: 6
Mechanical Help Needed.

I have a '96 phoenix 34' sfx. powered by a pair of 3116t a cats. it is a great boat with one exception. after running for a couple days (not a constant 24 hours but run a few hours and anchor for a while then move again.......) my starboard engine will die. it doesn't just stop but rather it seems like it is running out of fuel. we've had a mechanic look at it and, naturally, the engine ran fine.

I've had the tank cleaned and fuel polished, cleaned and rebuilt the racor, and made sure that fuel flowed through the hoses. the mechanic checked the fuel pressure and said that it was within spec.

I've been told that it could be the fuel pressure regulator, but I don't want to just through parts at it and hope that it works. is there a way to test the regulator? or should I just replace it? or could the problem be something else entirely?
__________________

__________________
mrmrezg is offline   Reply With Quote
Old 24-09-2015, 18:26   #2
Registered User

Join Date: Feb 2009
Posts: 1,848
Re: mechanical help needed.

Boat diesel.com is your best bet for help
__________________

__________________
motion30 is offline   Reply With Quote
Old 24-09-2015, 18:28   #3
Registered User

Join Date: Oct 2014
Posts: 6
Re: mechanical help needed.

Thanks, I'll go check them out.
__________________
mrmrezg is offline   Reply With Quote
Old 24-09-2015, 18:33   #4
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,334
Re: Mechanical Help Needed.

My guess is a fuel issue... as it often is.
Possibly tiny air leak?
Or fuel restriction.
Clogged fuel tank vent will do that... creates a vacuum in the tank until the engine quits. Separate tank for each engine on your boat?
Does the engine speed up erratically as it's stopping?
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 24-09-2015, 18:35   #5
Registered User

Join Date: Oct 2014
Posts: 6
Re: Mechanical Help Needed.

no, it's one big (300 gal) and the port engine and generator run jut fine.
__________________
mrmrezg is offline   Reply With Quote
Old 25-09-2015, 05:45   #6
Registered User
 
ranger42c's Avatar

Join Date: Aug 2012
Location: Maryland, USA
Boat: 42' Sportfish
Posts: 2,981
Re: Mechanical Help Needed.

My guess is air leak, such that fuel seems OK when tested but eventually air seeps in.

Just first guess, though.

Boatdiesel.com.

-Chris
__________________
Selby Bay, South River, Chesapeake Bay, USA.
ranger42c is offline   Reply With Quote
Old 25-09-2015, 10:33   #7
Senior Cruiser
 
River Cruiser's Avatar

Cruisers Forum Supporter

Join Date: Jul 2011
Location: UMR mm 283 /winter in Kansas
Boat: Bayliner 3870 41' oal.
Posts: 817
Re: Mechanical Help Needed.

Could be a faulty check valve on the fuel supply side. As Cat parts go they're cheap, I always carried spares.


Sent from my iPad using Cruisers Sailing Forum
__________________
River Cruiser is offline   Reply With Quote
Old 25-09-2015, 12:51   #8
Registered User
 
Terra Nova's Avatar

Join Date: Apr 2007
Location: Marina del Rey, California
Boat: Freya 39 cutter- Terra Nova
Posts: 3,645
Re: Mechanical Help Needed.

If you had fuel pressure and vacuum gauges you could easily troubleshoot this yourself.
__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
Terra Nova is offline   Reply With Quote
Old 28-09-2015, 23:15   #9
Registered User
 
MBWhite's Avatar

Join Date: Apr 2012
Location: Illinois
Boat: Hurley Alacrity
Posts: 370
Re: Mechanical Help Needed.

Here is some possibly helpful information:

I would check the fuel lines from the tank to the primary and secondary fuel filters. The 3116 has a history of the steel lines along the governor side of the block rubbing through and creating cavitation. If the hole is small you might not really notice a difference at first. This is where I would start. Once it dogs again check the fuel filter, if it's close to empty you obviously aren't getting the fuel you need. If you have a fuel priming pump start using that when the engine starts to die off, this will also tell you that the fuel system is lacking flow. One other tip is to put the fuel line before the secondary filter (closest to the governor) into a clean bucket of diesel and see if the engine runs better. But, I would definitely start at the steel fuel lines first......

From a school bus mechanic blog:

~~~~~School Bus Mechanic: Cat 3116 Troubleshooting No Power
__________________
MBWhite is offline   Reply With Quote
Old 10-10-2015, 18:18   #10
Senior Cruiser

Cruisers Forum Supporter

Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
Posts: 1,699
Re: Mechanical Help Needed.

I had a similar problem when I brought this boat home. I had a small air leak from the fuel line rubbing a hole on the engine beds. My engine room has a day tank the mains and 2 generators draw fuel from. Only 1 main was affected. Sometimes the hole would be covered enough that fuel was supplied normally. I had to disconnect the fuel line and do a pressure test to find the hole.
__________________

__________________
Lepke is offline   Reply With Quote
Reply

Tags
cal, mechanic

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
Surveyor(s) Needed for Rigging and Mechanical in Ventura Area montenido Monohull Sailboats 1 13-12-2014 10:15
Good Surveyor/ mechanical inspector needed GalaxyGirl Powered Boats 6 14-04-2014 09:15
Mechanical Option to Bypass the Hydraulic Autopilot with Mechanical Steering ? windtraveler Seamanship & Boat Handling 1 18-10-2010 08:47
Mechanical Aptitude Test knottybuoyz Engines and Propulsion Systems 66 05-11-2007 00:11
Mechanical Starters? Gallivanters Engines and Propulsion Systems 23 12-06-2006 19:47



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:03.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.