New Diesel Still with problems - SailNet Community
 
LinkBack Thread Tools
post #1 of 8 Old 05-30-2009 Thread Starter
Senior Member
 
1970Columbia34's Avatar
 
Join Date: Aug 2006
Location: Bay City, Mi
Posts: 319
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
Send a message via AIM to 1970Columbia34 Send a message via MSN to 1970Columbia34 Send a message via Yahoo to 1970Columbia34
New Diesel Still with problems

Well guys still having problems with the remanufactured motor. We put in the M25xp and Martec made a 16"x16 rh prop for the boat and 2 other prop makers confirmed that would be the prop for the boat, put the boat in the water could only get about 2100 rpms and 5.o knots. so figured the prop was wrong and martec stood by there prop and made a 16"x12p rh, pulled the boat and swaped the props to find that the motor still only would hit 2100 rpms and not only go 4 knots, so now we know its not the prop. my thinking is something is up the the motor what do you guys think? motor revs up just fine when not in gear 3200+ with ease. Any ideas I am trying to locate a good diesel mechanic to look at the motor. Thanks

Scott
1970Columbia34 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 8 Old 05-30-2009
Senior Member
 
Selkirk's Avatar
 
Join Date: Feb 2009
Location: Tupelo, MS
Posts: 190
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
I'm betting your engine is fuel starved. Doesn't take much fuel to run an unloaded diesel; takes a lot more to run it hard under a load.
Your diesel mechanic will probably be able to fix it by fixing the injector pump, probably by adjusting it.

If it puts out black smoke when he finally gets it up to speed, that'll be excess fuel and he'll adjust it back down.

Blue smoke; oil. Black smoke; fuel.

When you come to a "Y" in the road, take it....Yogi Berra
Selkirk is offline  
Quote Quick Reply Share with Facebook
post #3 of 8 Old 05-31-2009
Senior Member
 
Join Date: Jan 2007
Location: Ft. Lauderdale, FL currently CLODs [cruisers living on dirt]
Posts: 197
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
pull the filler cap off the fuel tank. Fuel starvation could be caused by vacuum at the tank if nothing else is obvious.

Jon D
SV Sirius
Moody 47
svsirius is offline  
Quote Quick Reply Share with Facebook
post #4 of 8 Old 05-31-2009
Senior Member
 
celenoglu's Avatar
 
Join Date: Dec 2008
Posts: 672
Thanks: 0
Thanked 14 Times in 13 Posts
Rep Power: 7
 
changing propellor pitch generally does not effect the load of the engine. You should have changed the diameter instead of the pitch.
celenoglu is offline  
Quote Quick Reply Share with Facebook
post #5 of 8 Old 05-31-2009 Thread Starter
Senior Member
 
1970Columbia34's Avatar
 
Join Date: Aug 2006
Location: Bay City, Mi
Posts: 319
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
Send a message via AIM to 1970Columbia34 Send a message via MSN to 1970Columbia34 Send a message via Yahoo to 1970Columbia34
Here is our fuel system setup. we have a 29 gallon tank that is in the cabin under a seat about the same height as the motor and about 10-12 feet away. The motor has a mechanical fuel pump on it, so with the long distance and no gravity feed to help we added a electric Facet fuel pump 4 psi just before the racor water seperator filter. from the racor filter to the fuel filter mounted on the motor and from there to the mechanical pump / injector pump. I just pulled the vent line and blew on it and it blows freely. I get return fuel from the last injector but its not streaming out just trickling. how would one adjust the amount of fuel on the injector pump. thanks guys.

On a prop note, I can only assume a less pitch prop would be easier to spin than a higher pitch prop since it not pushing as much water. the prop builder said that you should gain around 200 rpms per 2 pitch that you go down. and we saw nothing, exact same rpm and just less speed.

Thanks for all help and advice. Scott

Last edited by 1970Columbia34; 05-31-2009 at 08:13 AM.
1970Columbia34 is offline  
Quote Quick Reply Share with Facebook
post #6 of 8 Old 05-31-2009
Senior Member
 
timebandit's Avatar
 
Join Date: Sep 2002
Posts: 928
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
 
Check to be sure you throttle cable is operating properly at wide open. It sound like you just are not opening the throttle fully.

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

Mac 25
Copernicus
Southern California
I am not a prejudice racist sexist bigot. I just hate stupid people.
timebandit is offline  
Quote Quick Reply Share with Facebook
post #7 of 8 Old 05-31-2009
Senior Member
 
djodenda's Avatar
 
Join Date: Mar 2006
Location: Kirkland, Washington
Posts: 1,712
Thanks: 1
Thanked 5 Times in 5 Posts
Rep Power: 11
   
Quote:
Originally Posted by celenoglu View Post
changing propellor pitch generally does not effect the load of the engine. You should have changed the diameter instead of the pitch.
Huh?

David

David

1987 CS 36 Merlin "Kyrie"

"They drove a dump truck full of money up to my house. I'm not made of stone!" -Krusty the Clown
djodenda is online now  
Quote Quick Reply Share with Facebook
post #8 of 8 Old 05-31-2009
Senior Member
 
Selkirk's Avatar
 
Join Date: Feb 2009
Location: Tupelo, MS
Posts: 190
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
Originally Posted by 1970Columbia34 View Post
...........how would one adjust the amount of fuel on the injector pump. thanks guys.........
The procedure is detailed in the manual - not the operator's manual, the mechanics manual.
On my Yanmar it consisted of placing or removing shims within the injector assembly. Seems like injector timing and fuel amounts were adjusted the same way.....it'll take a mechanic either way.

When you come to a "Y" in the road, take it....Yogi Berra
Selkirk is offline  
Quote Quick Reply 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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel Engine Problems gmaurer Gear & Maintenance 3 06-29-2004 08:00 AM
Diesel Fuel Essentials Tom Wood Gear and Maintenance Articles 0 03-22-2004 07:00 PM
Diesel Fuel Essentials Tom Wood Her Sailnet Articles 0 03-22-2004 07:00 PM
Surveying a Diesel Engine Tom Wood Buying a Boat Articles 0 01-26-2003 07:00 PM
Surveying a Diesel Engine Tom Wood Gear and Maintenance Articles 0 01-26-2003 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome