Failed relative compression test ??? - Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 Old 05-18-2010, 07:25 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2010
Location: Ottawa,Ontario
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Failed relative compression test ???

Did a relative compression test and got some odd readings

Cylinder 8 was in the yellow at 5%

Cylinder 1 was at 4%

Cylinder 3 was at 4 %

Only 2 of my cylinders where at 0

We did a complete short block replacement 2 months ago
Replaced upper and lower EGR coolers
Truck is stock with DPF still on

Truck only has 50,000KM on it and new short block does not even have 1500KM

Would appreciate any insight before I tear this whole thing down again

Any ideas guys?
dmark4u is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 06-24-2010, 07:11 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2010
Location: Ottawa,Ontario
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Come on guys anyone ? I'm sure with all the smart techs on here someone must have an idea...
dmark4u is offline  
post #3 of 5 Old 06-24-2010, 07:34 AM
Powerstroke.org Sponsor

 
greasltn's Avatar
 
Join Date: Jan 2009
Location: Hillsborough, NC
Posts: 1,011
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
5% is an acceptable difference.

-John
Rudy's Diesel Performance - 919-383-9300 - Diesel Tech


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
greasltn is offline  
post #4 of 5 Old 06-24-2010, 10:33 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: May 2010
Location: Ottawa,Ontario
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
The IDS tool shows a yellow warning on anything higher then 3 %
Also Ford told states that even a 2% difference can cause damages to engine
They want me to tear apart and inspect everything but I have no clue where
to start looking
dmark4u is offline  
post #5 of 5 Old 06-26-2010, 10:38 AM
Powerstroke Techie

 
Join Date: Oct 2009
Posts: 1,682
Thanks: 0
Thanked 5 Times in 5 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Do a manual compression test, first.

The relative compression test sucks on a 6.4

Do the test 4 or 5 times and average the results.

Does the engine run OK?

Does it crank over 'evenly' or are there some 'fast' spots in it?

Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.
Big Angry Hillbilly is offline  
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:
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.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

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