Firing on all Cylinders? - SailNet Community
 
LinkBack Thread Tools
post #1 of 8 Old 07-01-2009 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,444
Thanks: 232
Thanked 107 Times in 97 Posts
Rep Power: 8
 
Firing on all Cylinders?

I've been told that I'm not firing on all cylinders.

When I bought my boat 2 years ago I had the Perkins 4-108 surveyed and the mechanic said one of the cylinders wasn't firing. He noticed at the time that we were over-propped and he figured the injectors got coked up with carbon. He said it might take an injector service to fix the problem or, if we pitched the prop down and ran it hard for a while it may just fix itself. We tried option 2. We took 3inches of pitch off the prop and ran it hard for quite a few hours, especially on a 3 week trip.

Now, I want to know how do I figure out if I'm firing on all cylinders? i.e. did I fix the problem or does it remain?

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 8 Old 07-01-2009
Senior Member
 
xsboats's Avatar
 
Join Date: Oct 2007
Location: St. Augustine, Florida
Posts: 337
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Buy a laser thermometer and point it at each cylinder head right next to the injector. If the cylinder is not firing, the temp. reading will be much lower.
xsboats is offline  
Quote Quick Reply Share with Facebook
post #3 of 8 Old 07-01-2009
Senior Member
 
xsboats's Avatar
 
Join Date: Oct 2007
Location: St. Augustine, Florida
Posts: 337
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
That will help diagnose your 4-108, but if your friends are saying you aren't firing on all cylinders, they probably know best!
xsboats is offline  
Quote Quick Reply Share with Facebook
post #4 of 8 Old 07-01-2009 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,444
Thanks: 232
Thanked 107 Times in 97 Posts
Rep Power: 8
 
Quote:
Originally Posted by xsboats View Post
Buy a laser thermometer and point it at each cylinder head right next to the injector. If the cylinder is not firing, the temp. reading will be much lower.
That sounds like it could work AND it involves buying a new toy with the word "LASER" in the title! Seriously though, won't the block equalize in temperature quite quickly, being metal and all? Should I run the test after a set number of minutes ie during warm up?


Any suggestions on where to buy one of these phazers?

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
post #5 of 8 Old 07-02-2009
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Try here
Not laser, but infrared, only $46.

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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #6 of 8 Old 07-07-2009
Don Radcliffe
 
Join Date: May 2007
Location: Santa Cruz
Posts: 396
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
For free you can let the engine idle, and crack the fuel injector inlet pipes one by one. If the cylinder was firing, the engine will slow down and run rougher when you loosen the nut on the injector pipe.
donradclife is offline  
Quote Quick Reply Share with Facebook
post #7 of 8 Old 07-07-2009 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,444
Thanks: 232
Thanked 107 Times in 97 Posts
Rep Power: 8
 
Quote:
Originally Posted by donradclife View Post
For free you can let the engine idle, and crack the fuel injector inlet pipes one by one. If the cylinder was firing, the engine will slow down and run rougher when you loosen the nut on the injector pipe.
A phazer toy is cool, and I LOVE another excuse to buy a tool but learning how to diagnose it with nothing more that what I have onboard is what it's really all about. THANKS!

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
post #8 of 8 Old 07-09-2009
Junior Member
 
Join Date: Jul 2000
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
The slacken of the injector HP connection is the best wah and have a roll of Kitchen tissue handy to catch the drops.

This is actually best done under load so that a poorley set fuel pump doesn t mess up the experiment. IE run the engine in gear and then slacken of the connections one by one and retighten before moving to the next. If there is no change in engine note when one is slack and spraying fuel then that cylinder is not working. Next remove that injector and check you have compression in that cylinder . If lots of compression then it could be an injector problem or pump problem. If no compression then valves or rings.

You need to ensure the engine does not start so may have to slacken of the other injector connections and catch the fuel with tissue.
bilgediver is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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
Atomic 4 - Water in Cylinders!!! wbgent Gear & Maintenance 27 03-15-2010 10:24 PM
Replace vs Rebuild? chtaylor Atomic 4 12 01-22-2009 10:08 PM
Californian version of Worthington horizontal cylinders klubko Gear & Maintenance 0 09-22-2008 06:39 PM
Airline Security Take Equipment! rwcat General Discussion (sailing related) 11 01-23-2005 04:16 PM
Firing warning shots legal or not? BigRed56 General Discussion (sailing related) 18 02-07-2002 04:11 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