Perkins 4108 motor getting air - 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 > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 
  #1  
Old 04-12-2010
Junior Member
 
Join Date: Jun 2007
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lbair is on a distinguished road
Perkins 4108 motor getting air

We have checked the fuel lines, the fuel filter, the return lines, got to the lift pump and found moderate fuel on the outside of it, all other leads exhausted but this...we ordered a lift pump today..... any leads or pointers!!!! The motor will run approx an hour then will accelerate up several times and then quits...
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 04-12-2010
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
What was the last thing changed on the engine's fuel system??? As a general rule, if the engine was working previously and something was modified, upgraded, changed, and the engine isn't working properly, it is most likely something that you touched in the last modification, upgrade or change.

One thing to check are the banjo bolts and crush washers. If you overtightened the banjo bolts—that can result in a leak in the fuel system.

Another thing to look at is the fuel pickup tube in the fuel tank. If the pickup tube has a screen on it, and many come that way, it could be clogging up and causing the surging and dying.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.

Last edited by sailingdog; 04-12-2010 at 08:34 PM.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 04-12-2010
Capttman's Avatar
Member
 
Join Date: Mar 2010
Location: New England/ Florida
Posts: 41
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Capttman is on a distinguished road
Send a message via Skype™ to Capttman
Very possible that the fuel filter gasket is not seated properly or the bleeder screw on top of the filter needs a new O ring
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 04-12-2010
Junior Member
 
Join Date: Jun 2007
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lbair is on a distinguished road
nothing has been changed since I changed the filters in the fall, re-changed the racor filter this wk, fuel tank was replaced in 05....and other leads???
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 04-12-2010
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Did you run the engine after changing the filters in the fall or before changing the Racor filter?
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 04-12-2010
Junior Member
 
Join Date: Jun 2007
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lbair is on a distinguished road
the motor was run at the dock before putting her away and then again when launched, until last wknd when was towed back to dock, then rechanged all filters, checked hoses, had a mechanic look at her and he checked back to fuel tank and moved towards the engine where he found a moderate amount of fuel on the lift pump.....
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 04-12-2010
poopdeckpappy's Avatar
Senior Member
 
Join Date: Jul 2006
Location: San Diego
Posts: 5,873
Thanks: 25
Thanked 41 Times in 35 Posts
Rep Power: 10
poopdeckpappy has a spectacular aura about poopdeckpappy has a spectacular aura about
Quote:
Originally Posted by lbair View Post
The motor will run approx an hour then will accelerate up several times and then quits...
Wow, you got an hour ??, I only got 30-45mins before my 108 did the same, changed the lift pump and it has run like a champ since.
__________________
1978 Tayana 37
1955 Blanchard 51 Custom ( I got a woody )
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 04-12-2010
Junior Member
 
Join Date: Jun 2007
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
lbair is on a distinguished road
thanks - thats reassuring to hear!! we hope to be sailing again this wknd
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 04-13-2010
CarelessNavigator's Avatar
Member
 
Join Date: Mar 2007
Location: Grande Prairie, Alberta
Posts: 64
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
CarelessNavigator is on a distinguished road
Quote:
Originally Posted by lbair View Post
We have checked the fuel lines, the fuel filter, the return lines, got to the lift pump and found moderate fuel on the outside of it, all other leads exhausted but this...we ordered a lift pump today..... any leads or pointers!!!! The motor will run approx an hour then will accelerate up several times and then quits...
Air in the fuel system indicates a leak on the primary/suction side of the fuel system. A fuel leak is always going to be on the secondary/pressure side of the fuel system.

Symptoms of air in the system would be, hard starting, surge at idle or rough idle, engine misses under load, low power.

Symptoms of a leak would be, hard starting, engine misses under load, low power, excessive fuel consumption and of course fuel all over the place.

Good Luck!
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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
old Perkins 4108 firemanbob55 General Discussion (sailing related) 3 01-20-2010 11:59 AM
Low-Pressure Systems Michael Carr Seamanship Articles 0 12-08-2000 08:00 PM


All times are GMT -4. The time now is 02:16 PM.

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

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.