Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Modular V8 (4.6L, 5.4L)
Sign in using an external account
Register Forgot Password?


5.4 plug issue not the norm

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-13-2013, 04:36 PM
BumpJr BumpJr is offline
Senior User
 
Join Date: Mar 2013
Location: Middleboro, Ma.
Posts: 145
BumpJr is starting off with a positive reputation.
5.4 plug issue not the norm

So I've read on the subject and have talked to many on the blow out problem with these motors and had the misfortune of this on mine about 5k miles ago at around 104k in my wife's Expedition. Well when it blew out breaking the coil out with it she want close to home so I roadside fixed with another coil I had and another plug that actually threaded back in. It lasted about 3wks and blew out again. So at that point I had a shop throw an insert in. I didn't have time or tool kit and it needed to be up and running quick. My problem is that the plug just blew out again. This is the third plug back on the drivers side which everyone seems to have the most trouble with. The shop is taking a look at it on Monday but I've never seen a plug blow out of a steel insert. The threads on the plug are perfect but the tip is bent over the electrode completely. I'm actually wondering if the piston is hitting the plug and pushing it out. The plug only lasted a month in a steel insert. Has anybody heard of a piston pushing the plug out? The motor runs and sounds fine until the plug is out. Wondering if a pin is worn or something is stretched. Sucks because it just hit 109k as it blew. Thanks for any input
Reply With Quote
  #2  
Old 04-14-2013, 10:42 PM
Beechkid Beechkid is offline
Moderator
 
Join Date: Aug 2002
Location: Southern California
Posts: 3,363
Beechkid is a splendid one to beholdBeechkid is a splendid one to beholdBeechkid is a splendid one to beholdBeechkid is a splendid one to beholdBeechkid is a splendid one to beholdBeechkid is a splendid one to beholdBeechkid is a splendid one to behold
Quote:
Originally Posted by BumpJr View Post
. Has anybody heard of a piston pushing the plug out? The motor runs and sounds fine until the plug is out. Wondering if a pin is worn or something is stretched. Sucks because it just hit 109k as it blew. Thanks for any input
IMHO, if the piston hit the plug hard enough to push it out, the piston would have damage as well.
__________________
Member: Never trust a person over 40 who drives a Chevy club
Flatheads ain't so bad!
Certified backyard mechanic I & II
Reply With Quote
  #3  
Old 04-15-2013, 07:29 AM
JWA's Avatar
JWA JWA is offline
Post Fiend
 
Join Date: Aug 2010
Location: Reynoldsburg, Ohio
Posts: 7,800
JWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputationJWA has a superb reputation
Quote:
Originally Posted by Beechkid View Post
IMHO, if the piston hit the plug hard enough to push it out, the piston would have damage as well.
+1 there!

I'd have your shop run an inspection camera down the plug hole and look around---that might help diagnose all this.

Odd that its just one plug affected though, especially the bit where no thread damage seems to occur.

I'd be highly interested to know more about this, never yet heard of it here.


Hope its not too severe a repair though!
Reply With Quote
  #4  
Old 04-15-2013, 06:53 PM
galaxie641 galaxie641 is offline
Postmaster
 
Join Date: Nov 2006
Location: SE Wyoming
Posts: 4,487
galaxie641 has a very good reputation on FTE.galaxie641 has a very good reputation on FTE.galaxie641 has a very good reputation on FTE.galaxie641 has a very good reputation on FTE.
MY bet is you are looking at a new head, after my insert blew they said it was very rare you could get another one in. Either new head or replacement engine, with your low miles a new head might not be bad.
__________________
'51 F3 Flat8
'64 Galaxie 352 4bbl
'72 F250 400/C6
'08 CVPI
'09 F150 5.4L
'10 Mustang GT
Reply With Quote
  #5  
Old 04-23-2013, 05:21 PM
blueovalandy blueovalandy is offline
Junior User
 
Join Date: Jul 2011
Location: Charleston
Posts: 58
blueovalandy is gaining momentum as a positive member of FTE.
If the piston is close enough to hit the spark plug, it would have done it as soon as the engine was cranked right after the repair.

My guess is something was wrong with the insert or its installation. The plug has a crush washer that needs to be seated against the aluminum head itself. If the insert is too large, the plug washer will be seated against the insert not the head itself.

Andy
Reply With Quote
  #6  
Old 04-26-2013, 10:11 AM
fordiesel69 fordiesel69 is offline
Elder User
 
Join Date: Nov 2000
Location: Erie, PA
Posts: 612
fordiesel69 is starting off with a positive reputation.
If they used a "timesert" brand insert, they probably did not use the last tool to finish the job. Have them redo it. Timesert is the only way to go aside from a new head.

If they use a different brand, scrap the head. It is done for. Helicoils simply will not work.

On a side note, what year did ford revise the head.
__________________
My Rigs:
07' F-150 XL EXT CAB, 4.6L V8, 4x4, 3.55's
86' F-250 XLT Lariat,6.9 Diesel, Ext Cab, 4x4, 4.10's, 8'bed, Push Button Glowplugs, etc...
99' Crown Vic Police Interceptor (P71) w/Steet apperance package
Reply With Quote
Old 04-26-2013, 10:11 AM
 
 
 
Reply


Similar Threads
Thread Thread Starter Forum Replies Last Post
Spark Plug thread repair. With Photos tmehrkam Modular V10 (6.8l) 37 10-16-2014 07:26 PM
New info about blowing plugs cyclone-429 1997 - 2003 F150 12 09-17-2014 08:19 AM
Blown Plug on #10 cylinder - Best fixes? icentropy Modular V10 (6.8l) 12 03-19-2014 11:08 AM
Triton blown plugs leedall24 Modular V8 (4.6L, 5.4L) 4 07-20-2011 10:18 AM
Cylinder Head Repair fkhcle Expedition & Navigator 3 04-13-2009 06:34 AM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Modular V8 (4.6L, 5.4L)

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »


All times are GMT -5. The time now is 04:10 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup