Low compression on one cylinder....... - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-04-2009, 07:19 AM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: Hinton,Alberta,Canada
Posts: 151
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Low compression on one cylinder.......

I did a compression test on my 03 6.0l and I have very low readings on one cylinder. The truck won't start right now so I did the test cold. Was getting high threes on other cylinders but one of them is 155 psi and when I squirt oil down that one it jumps to 175.

Think I have bad rings or could this be a bent valve??

I've only tested the drivers side so far as the passenge side seems very hard to get at....
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 10-04-2009, 07:54 AM
Compression Ignition Addict
 

Join Date: Mar 2009
Location: Norfolk Va
Posts: 156
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
just currious, which cylinder on the drivers side had low compression? Ive been having some issues of my own and i think a compression test is going to be the next step.
Reply With Quote Quick reply to this message
  #3  
Old 10-05-2009, 08:59 AM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: Hinton,Alberta,Canada
Posts: 151
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
It was the first cylinder on the drivers side closest to the front of the engine.
Reply With Quote Quick reply to this message
  #4  
Old 10-05-2009, 12:37 PM
Compression Ignition Addict
 

Join Date: Mar 2009
Location: Norfolk Va
Posts: 156
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
im gona go buy a compression test gauge of my own hopefully sometime this week. What did you use to adapt it to the glow plug hole.
Reply With Quote Quick reply to this message
  #5  
Old 10-05-2009, 03:15 PM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: Hinton,Alberta,Canada
Posts: 151
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
I had a compression gauge that I got years ago from MAC TOOLS. It was a kit for motorcycles and atv's/snowmobiles. One of the hoses in the kit fit no problem.
Reply With Quote Quick reply to this message
  #6  
Old 10-05-2009, 03:21 PM
Compression Ignition Addict
 

Join Date: Mar 2008
Location: Marysville, ohio
Posts: 682
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
What were the readings on the other cylinders
Reply With Quote Quick reply to this message
  #7  
Old 10-05-2009, 03:28 PM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: Hinton,Alberta,Canada
Posts: 151
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
The readings were all in the high 3's but that was with the engine cold...wonder why I would have low compression just on one cylinder...?
Reply With Quote Quick reply to this message
  #8  
Old 10-05-2009, 03:29 PM
Compression Ignition Addict
 

Join Date: Jan 2009
Location: Hinton,Alberta,Canada
Posts: 151
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
I have the valve cover off now...don't see anything abnormal in the valve train area.
Reply With Quote Quick reply to this message
  #9  
Old 10-05-2009, 05:25 PM
Compression Ignition Addict
 

Join Date: Dec 2008
Location: port arthur texas
Posts: 3,514
Thanks: 0
Thanked 20 Times in 19 Posts
Feedback Score: 0 reviews
Since you were able to increase your pressure readings by squirting oil in it. That indicates worn rings/cylinder liner. No change in readings would result if it was vaalve problems. Since most bore scopes are too big to fit in the glow plug hole or the injector hole,unless ya pull the tube. It will be hard to tell a valve without pulling the head.
As to why,well a number of reasons could be why. Bad ring,ring damaged during install,or injector dumping too much fuel and diluteing the oil film on cylinder wall.
Reply With Quote Quick reply to this message
  #10  
Old 10-05-2009, 05:28 PM
Compression Ignition Addict
 

Join Date: Mar 2009
Location: Norfolk Va
Posts: 156
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
i think i may pull the valve cover off mine some time this week or weekend and take a look for myself also. Ive been hearing a clatering noise.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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.



Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 12:58 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors