Valve issue - PowerStrokeNation : Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 03-27-2019, 03:12 AM Thread Starter
Grumpy welder
Join Date: Mar 2019
Location: Ontario, Canada
Posts: 3
Valve issue

I had to re-do someone elseís idiocy today and re-Seal my oil cooler. While I was there, I replaced the unison ring, did the EGR block off and replaced the weak FICM power unit.

Itís had a skip when starting since I bought it. Not horrible, but today when the plenum was off I noticed that one of the runners for #4 was excessively sooty and caked. A couple of text messages later and itís best spitball diagnosis is a bad valve.. either cracked or bad seat.

My question is, whatís been the experience here with this kind of thing? Is it a panic fix or am I able to re-do a set of heads in the next couple of weeks (months) and stud it when I have time in August? This is my daily and I use it for my work. No heavy hauling but i canít be without it.
RedSeal 6.0 is offline  
Sponsored Links
post #2 of 3 (permalink) Old 03-27-2019, 12:17 PM
PSN Veteran
Weatherlite's Avatar
Join Date: Aug 2012
Posts: 1,252
Re: Valve issue

I'd do a compression/leak-down test to verify there's a problem with that cylinder first. If you find an issue, I'd pull the intake again and do the leak down test....or just apply pressurized air and keep it going, since I would imagine a bad valve or valve seat would just let the air flow. If it's pouring out that runner, you've verified your issue. Actually, I would think you could probably do this with the intake on as well, because I really can't see that changing the results any since the only runners it could come out of are those two.

Anyway, once you're sure that's your problem, and not just a bad injector, I'd take into account how long I'd had the issue and whether it had gotten worse over time before deciding if I should do it sooner rather than later. That's the backyard/broke mechanic in me talking. lol If I had the money, I'd be fixing it right away.....or buying a new set of heads and swapping them out. Doesn't take as long as one might think if you have the right tools.

If it is indeed leaking, you could potentially damage the head beyond repair. A new seat or valve is one thing, but it's possible it may be beyond that already. Other than taking the head off, the only way to really check is with some sort of bore scope. If you have to wait to do it, don't wait too long, and certainly don't run it hard/hot....and be prepared to find out you can't repair the head, just in case of a worst case scenario.

2004 Excursion 6.0
New HPOP/HPO system o-rings; Updated standpipes and dummy plugs
EGR delete; Rebuilt oil cooler; CCV collection mod
VR Black Diamond head gaskets and ARP studs
Oil and coolant bypass filters; Shell EC-1 coolant
Rebuilt turbo; 250 amp alt; 6000 watts of brain scrambling
One giant 240 pound English Mastiff riding shotgun!
Weatherlite is offline  
post #3 of 3 (permalink) Old 03-27-2019, 12:30 PM
Master BS'er
jamiesaun's Avatar
Join Date: Nov 2016
Location: Boise Idaho
Posts: 5,695
Re: Valve issue

I've found Skipping is usually a bad injector. But do as told and leak down test it. You don't need to dismantle anything except the glow plugs.

Brother James

Ps...Im pretty frickin awesome!
jamiesaun is offline  

Quick Reply

Register Now

In order to be able to post messages on the PowerStrokeNation : 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:


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange fueling issue or transmission issue????? NEVRNF Engine & Transmission Conversion 14 09-21-2009 07:05 PM
12 valve or 24 valve???? early99stroke General Questions & Discussion 33 01-05-2009 02:51 AM
Tuning issue or Injector issue? PowerstrokeJunkie 7.3L Power Stroke - Aftermarket & Performance 12 11-01-2008 02:11 PM
CPS... The non issue issue... CSIPSD 7.3L Power Stroke Technical Info 61 08-27-2007 08:07 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

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