вЂњAt the end of the plug an electrode extends a bit beyond the threads and creates a gap between the plug and the cylinder head which gets filled with carbon deposits. Lincoln Navigator: 2005, 2006, 2007, 2008ДЇord introduced an all-new spark plug design with a 2-piece shell for the 5.4 Triton engine.Since, it all has to be removed before starting up the engine, this could translate to a lot of work.Д¬ars with the 5.4 Triton engine mostly affected by this problem are: In the worst case scenario, spark plug fragments (parts of metal or ceramic) could end up in the cylinder. The spark plugs were so secure and so snug in their housings that upon attempting removal, the spark plug would often snap in half. Now, they had begun experiencing problems during the replacement of the spark plugs. Interestingly enough, for the Ford Triton motors produced after 2004, owners and service technicians reported exactlyВ the opposite problem with blown spark plugs. 5.4 Triton Spark Plug Replacement Problem However, some reports do suggest that better results can be achieved with HeliCoil kit. They encouraged the installation of the Lock-N-Stitch thread inserts. Nevertheless, the problem persists and one buying a vehicle with a 2 valve 5.4 Triton engine should be aware of the issues and thoroughly inspect the engine.ДЇord admitted the issue and even offered a solution with Lock-N-Stitch thread inserts in the head. Others debate about the problems with over-torquing or under-tightening. Some can argue that there are not enough threads in the head for the spark plug to grab on to. It is still a bit of a mystery of why this happens in the first place. That is what Ford technicians do advise to this day, despite the cost involved. Prior to this, the only viable solution was to actually replace the head altogether. The problem was so common that numerous aftermarket specialists did, in fact, provide tools and solutions to drill, retap, and rethread the spark plug hole in the head. Interestingly enough, blowing out usually happens on the passenger side with the spark plugs on the third and fourth cylinder.

Plastic pieces, on the other hand, can fall to the oil pan and partially block the oilвЂ™s path. No reason to tell you that this can damage the timing chain further. These plastic pieces can become fully detached from metal surfaces over time thus enabling metal-to-metal contact of the timing chain and metal carriers guides were attached to. The loosened timing chain will rattle like mad and damage plastic timing chain guides. In this case, the domino effect is more than likely. If you can hear rattles, the timing chain may have become loose due to the blown out tensioner. So, listen carefully for any unusual rattles after a cold start. Timing chain rattles are most noticeable at the very start. Having all these parts working correctly is crucial as all of them affect moving parts of the engine and, more or less, keep the engine from tearing itself apart. VVT hasnвЂ™t been installed in older 2 valve motors. Bear in mind that cam phasers are part of the Variable Valve Timing system which is an important component of the 5.4 Triton engine with 3 valves per cylinder. While causes for such sounds can be numerous, owner experiences have shown that the most likely reasons can be blown out tensioners, a loose timing chain, and cam phaser breakage. The engine sounds strange? You can hear a lot of knocking noises on acceleration, cold startup, or when you let off the throttle.

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