Universal m3-20 problems. - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
 Not a Member? 
  #1  
Old 02-01-2011
Junior Member
 
Join Date: Apr 2009
Location: Fort Lauderdale
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
JBIZZ is on a distinguished road
Universal m3-20 problems.

I'm having a problem w/ my engine (Universal M3-20A). It runs good for about a half hour then slowly shuts down. When I try to restart it it takes a while but then runs fine for extended periods of time w/ small fluctuating of RPMs once in a while. I replaced the fuel filters last October & have only put @ 15 hours since then. I have also replaced the metal fuel lines & banjo washers recently to stop a fuel leak. It seems to only run below 500 RPMs or above 1000 RPMs but nowhere in between. Also it will shut of when I have the throttle all the way back, which it did not use to do. I don't now if I have air somewhere in the fuel system, if my filters are clogged (which I doubt), or if I need to service the injectors. The engine was running fine before I replaced the fuel lines. I did leave the fuel system dry for 2 months while waiting for parts. Any suggestions are greatly appreciated. I just want to know what I should check before I start spending money & taking things apart again.
Reply With Quote Share with Facebook
  #2  
Old 02-01-2011
Two many boats!
 
Join Date: Oct 2009
Location: Bowie MD
Posts: 126
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
degreeoff is on a distinguished road
just a thought BUT I had a strange thing happen on my M-25 the shutoff lever (to cut fuel flow) had the spring inside wear out. Now when this happened the engine would lose power and be hard to start. it was running with 1/2 the fuel delivery. I soved the problem with an external return spring.Might want to check that? Also go back and retighten the clamps on all your fuel lines TO the engine and double check those just in case?

Josh
__________________
I love to sail, coming from a Swordboat capt's loin one would think I'd of caught the bug long before now! Oh well, this ones for you Bisque...(My Father may he RIP)

Now If I could only stay away from working on the damn things I could sail more!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Current boat...
-1985 c-30 TR DONE!! after two new engines and too much labor she floats sails and steams....
Reply With Quote Share with Facebook
  #3  
Old 02-01-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,390
Thanks: 63
Thanked 160 Times in 157 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Degree may have a point, but in all probability you've got an air bubble somewhere left over from your extended outage.

These can be difficult to get out, you may need to bleed well beyond what 'looks' good to get rid of the air. Another thing to double check is that you do not still have a leak in the suction side of the fuel system.. these rarely leak diesel but always seem to suck in enough air to drive you nuts...
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #4  
Old 02-01-2011
Junior Member
 
Join Date: Apr 2009
Location: Fort Lauderdale
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
JBIZZ is on a distinguished road
Thanks for the advice degreeoff & Faster. I'm gonna try to bleed the fuel system more thoroughly & check my hose connections. We'll see what happens.
Reply With Quote Share with Facebook
  #5  
Old 02-03-2011
Member
 
Join Date: Dec 2009
Location: San Francisco bay
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
olgriz is on a distinguished road
Bleed, bleed, bleed.
Reply With Quote Share with Facebook
  #6  
Old 02-03-2011
Senior Member
 
Join Date: Jan 2005
Posts: 103
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
wescarroll is on a distinguished road
I would think an air leak. Check the fuel pickup in the tank completely as a crack any where eventually becomes an air leak(experience), check for debris in the tank or fouled fuel and water. A friend had a leaf get into his tank somehow, and it would intermittently plug the fuel pickup. When the engine stopped it would release and the fuel would flow again. It was a real headache to find. Also as said before bleed bleed bleed you fuel line
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
MPG for Gas Universal or Atomic 4 EJO Irwin 8 05-25-2011 08:05 AM
Universal Diesel M25 Walt352 Diesel 3 09-16-2010 07:44 AM
ignition problems universal seaduced8104 Diesel 3 05-22-2010 07:58 PM
Westerbeke/Universal kccollbran Gear & Maintenance 1 08-03-2008 06:15 AM
Universal M-25 engine Gary1 Gear & Maintenance 11 07-15-2008 09:22 AM


All times are GMT -4. The time now is 12:05 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012