blown hg and valves hitting the pistons...help - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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 07-17-2012, 03:10 PM
Compression Ignition Addict
 

Join Date: Feb 2012
Location: saint joseph
Posts: 165
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
blown hg and valves hitting the pistons...help

I had my truck studded last fall and its been in the shop for 10weeks and i just heard back from them today. They said my hg were blown worse then they have ever seen and almost all the valves have touched the pistons. They said its from over reving the engine. I have innovative xrace tune i run as a dd and my shift points are right at 4k and they shift superfast. What else can cause this? Im afraid the shop is gunna try to not warrantee the hg and thats to expensive to redo every 8-10months.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 07-17-2012, 03:31 PM
Compression Ignition Addict
 

Join Date: Nov 2011
Location: Concord, NC
Posts: 1,035
Thanks: 0
Thanked 15 Times in 13 Posts
Feedback Score: 0 reviews
IMO if they did the job before they took too much off of the heads thus decreasing the valve to piston clearance. If so, they are at fault.
Reply With Quote Quick reply to this message
  #3  
Old 07-17-2012, 03:36 PM
Slacker



 

Join Date: Dec 2006
Location: Surprise, Arizona
Posts: 17,188
Thanks: 13
Thanked 57 Times in 45 Posts
Feedback Score: 4 reviews
Valve to piston contact can occur exactly like they are saying. When your engine revs so high, the valves can float - meaning that they don't compress all the way back to fully seat before being opened again. This can allow them to remain open and contact the pistons.
Reply With Quote Quick reply to this message
  #4  
Old 07-17-2012, 03:39 PM
Compression Ignition Addict
 

Join Date: Nov 2011
Location: Concord, NC
Posts: 1,035
Thanks: 0
Thanked 15 Times in 13 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by Evil Eye View Post
Valve to piston contact can occur exactly like they are saying. When your engine revs so high, the valves can float - meaning that they don't compress all the way back to fully seat before being opened again. This can allow them to remain open and contact the pistons.
Correct, but how come almost everyone else can run those tunes and drive like a mad man and never have these issues? I think his prior work is to blame if he is in fact right about his shift RPMs. Just my 2c
Reply With Quote Quick reply to this message
  #5  
Old 07-17-2012, 03:44 PM
Compression Ignition Addict
 

Join Date: Feb 2012
Location: saint joseph
Posts: 165
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
They said they checked the clearances from the valves to the heads and it was "well within spec".
Reply With Quote Quick reply to this message
  #6  
Old 07-17-2012, 03:45 PM
Slacker



 

Join Date: Dec 2006
Location: Surprise, Arizona
Posts: 17,188
Thanks: 13
Thanked 57 Times in 45 Posts
Feedback Score: 4 reviews
I would tend to agree. I didn't read in your original post where they did anything to the heads when the HG's were replaced. Did they "shave" them down to get them flat and true? What about the block?

***Edit: Well, that answers that.
Reply With Quote Quick reply to this message
  #7  
Old 07-17-2012, 03:50 PM
Compression Ignition Addict
 

Join Date: Feb 2012
Location: saint joseph
Posts: 165
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
When i did the head studs because my stock gaskets were blown they fixed a crack in my head and never even gave me the option of just replacing it. The head shop is separate from the place that did my hg. I just think its odd they blew and then my valves are hitting also when i didnt have the problem before getting studded.
Reply With Quote Quick reply to this message
  #8  
Old 07-17-2012, 03:53 PM
Compression Ignition Addict
 

Join Date: Feb 2012
Location: saint joseph
Posts: 165
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
The did plane the heads and fix the one crack the last time. And they just told me today they still looked fine and all the clearances were right. Could it be possible my valve springs are getting weak? I have 170k on my truck
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:
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 On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 03:38 PM.


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