Valve Stem mushrooming - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 1 Old 08-25-2012, 07:09 PM Thread Starter Rookie
Join Date: Aug 2012
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Valve Stem mushrooming

2000 with 210,000. Bought with broken #5 piston, appears to have had a bad injector that bled into cylinder and cracked the piston. Cylinder continued to fire as evidenced by the hole in piston and underside of the piston both exhibiting some aluminum melting. Bored .020, new Ford Master Rebuild kit. Noticed on 3,5,2 and 6 (middle 4 cylinders) that the exhaust valves indicate some mushrooming on the tops of the valve stems. Several mechanics looked at it and didn't seem too concerned. Engine machine shop clean up the mushrooming and did a valve job and didn't seem too concerned. Mushrooming was not super extreme but would not allow the valves to be removed without first cleaning or they would have damaged valve guides. Lifters appear good, did not disassemble. Rollers are excellent and no wear patterns appear on the camshaft lobes. Does anyone have any insight or experience with this situation. The lifters are hydraulic so where is the 'slap' coming from? Engine knock, fuel delivery, timing? I am replacing all 8 injectors during the rebuild. Thanks for any feedback.
RazzleFrazzle is offline  
Sponsored Links

mushroomed valve stems , valve stem , valve stem damage

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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