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51
4th September 08:43
External User
Posts: 1
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Actually proper torque is essential for all aluminum heads. The Ford problem
does appear to be especially common, but it is not unique. One thing I don't understand is that no one heard of this problem before 1997. Ford modular engines have been in production since the early 90's. The plug design was the same from the early 90's until 2003. Why don't we hear about significant numbers of plugs blowing out of older Town Cars, Mustangs, or Crown Victorias (all which used the modular V-8s). My personal theory is that although the 5.4L engines uses the same heads as the 4.6L engines, the 5.4L engines stress the heads to a greater degree, making proper torquing of the plugs excessively critical. I consider this a design defect but one that can be avoided if you are very careful. In my family we have owned a total of 5 Fords with the modular V-8: 1992 Mercury Grand marquis - 4.6L no problems in 8 years, 90k miles 1997 Ford Expedition - 5.4L - no problems in 5 years 150k miles 2000 Mercury Grand Marquis - no problems in 6 years 80k miles 2001 Ford Mustang - 4.6L - no problems in 4 years, 50k miles 2003 Ford Expedition - 5.4L - no problems in 4 years, 100k miles The plugs were changed in the two Expeditions (100k miles for the '97, 80k miles for the '03). http://www.babcox.com/editorial/ar/eb40340.htm http://autorepair.about.com/library/faqs/bl466h.htm http://www.tundrasolutions.com/forum...k-plug-thread/ Ed |
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56
4th September 08:43
External User
Posts: 1
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You've expressed my sentiment on this issue better than I could have
type it out (combining your last few posts into one reply here). I particularly feel you are right on about the engines not being made durably enough to withstand normal, real world service procedures and precautions. Obviously something about this series of engines is designed more poorly than the vast majority of the competition, otherwise these spark plug failures wouldn't be happening at all. This isn't an endorsement nor would I attempt it, but I bet you I could take any other engine and either hand tighten the plugs with only an extension and socket -or- blast them with an impact without fear of ejection (for many years/miles down the road). Why this design is so finicky, I haven't the faintest. I trust you've seen or heard about the bizarre new head design and plugs that Ford implimented with the revised 3 valve engine design; if not, here's a link to a jpeg: http://info.rockauto.com/Honeywell/A...HT1_012406.jpg Do those look failure prone or what? BTW, they are narrower than standard 5/8" hex plugs (9/16"). There are already technicians' accounts of the extended tip getting stuck in its bore and snapping off. Ford seems to be jumping out of the frying pan and right into the fire on this issue, to steal an idiom. Toyota MDT in MO |
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59
4th September 08:43
External User
Posts: 1
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Ford changed the head to get more power. The so called PI heads. The
spark plugs were changed at this times, but I've seen people claim these blow as well. When they changed to the three valve heads, the plugs were radically changed. I have not seen anyone claim that they blow - just that you can't get them out easily. There are Recalls (usually safety related), Customer Satisfaction Programs (to fix common Consumer Complaints), Technical Service Bulletins (to describe common problems and solutions), and OASIS messages (to describe less common problems and solution on a faster turn around). Safety recalls are always done at the companies expense no matter what the warranty status. Customer Satisfaction Programs may cover the complete cost of a repair, or a portion, and usually have an expiration date. TSBs and Oasis messages don't imply that the company will pay for a repair, although they may cover the repair under the standard warranty. As far as I know there are no recalls or Customer Satisfaction Programs related to the "spark plug blowing" concern. Ford did recently issue a TSB (07-21-2) authorizing a particular type of thread repair system for non-warranty repairs for certain Modular V-8 . In the past, Ford only authorized head replacement as a fix for a blown spark plug. Head replacement is still the only authorized fix for a vehicle under warranty. For vehicles out of warranty, the Lock-n-Stitch. Here (again) is the text of the TSB: TSB 07-21-2 4.6L 2V, 5.4L 2V, OR 6.8L 2V - SPARK PLUG THREAD REPAIR PROCEDURE - NOT COVERED UNDER NEW VEHICLE LIMITED WARRANTY Publication Date: October 17, 2007 FORD: 1997 Thunderbird 1997-2004 Mustang 1997-2008 Crown Victoria 1997-1999 F-250 Light Duty 1997-2004 Expedition 1997-2008 E-Series, F-150 1998-2004 F-53 Motorhome Chassis, F-Super Duty 2001-2005 Excursion 2002-2006 Explorer LINCOLN: 1997-2007 Town Car 1998-1999 Navigator MERCURY: 1997 Cougar 1997-2008 Grand Marquis 2002-2006 Mountaineer This article supersedes TSB 07-15-2 to update the vehicle model years. ISSUE: Some 1997-2008 vehicles equipped with a 4.6L 2V, 5.4L 2V, or 6.8L 2V engine and aluminum cylinder heads may experience a spark plug port with stripped or missing threads. ACTION: Follow the Service Procedure steps to correct the condition for non warrantable repairs. SERVICE PROCEDURE Ford Motor Company now authorizes LOCK-N-STITCH aluminum insert and tool kit as a proper repair procedure. Follow the procedure included in the tool kit for using the tools and inserts. Tool kits and inserts can be ordered from Rotunda by calling 1-800-Rotunda (768-8632). Choose option two (2), part number 302-00001. NOTE:FORD MOTOR COMPANY HAS DETERMINED THAT REPAIRS MADE WITH THESE ALUMINUM INSERTS AND LOCK-N-STITCH TOOLS DO NOT AFFECT THE HEAT TRANSFER FUNCTION BETWEEN THE SPARK PLUG AND THE CYLINDER HEAD. [note from Ed W - http://fulltorque.com/ ] NOTE:THIS PROCEDURE IS NOT AUTHORIZED AS A FORD WARRANTY REPAIR. FOR VEHICLES WITHIN WARRANTY, REPLACEMENT OF THE CYLINDER HEAD IS RECOMMENDED. NOTE: THIS IS THE ONLY FORD AUTHORIZED PROCEDURE FOR SPARK PLUG THREAD REPAIRS. NOTE: THIS PROCEDURE IS AUTHORIZED FOR ESP REPAIRS AND RETAIL REPAIRS. WARRANTY STATUS: Information Only - Not Warrantable --------------------------------- |
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