Understanding the early 6.7 valve cracking problems
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Understanding the early 6.7 valve cracking problems
a lot of folks incorrectly believe the early 6.7 cracked cable problem is caused by broken glow plugs. As explained in this video, broken glow plugs and cracked valves are two different problems.
https://www.youtube.com/watch?v=_FBg4UIeCMQ
https://www.youtube.com/watch?v=_FBg4UIeCMQ
Post Fiend
Joined: Nov 2001
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From: Tallassee, ALabama
The trucks sold before April 2010 had exhaust seat problems. The exhaust seats would "fall out" of the heads. This would cause the valve warping or valve failure. To prevent the dealer from spending hours tearing the engine down, they determined a quick check was to inspect the tips of the glow plugs. If damaged, then they concluded the valve seats failed. If not damaged, then they would have to disassemble the engine to determine the problem.
By now, most of those engines should have exhibited the failure if they were going to fail and have been fixed
By now, most of those engines should have exhibited the failure if they were going to fail and have been fixed
Logistics Pro
Joined: Mar 2005
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From: West Michigan
The trucks sold before April 2010 had exhaust seat problems. The exhaust seats would "fall out" of the heads. This would cause the valve warping or valve failure. To prevent the dealer from spending hours tearing the engine down, they determined a quick check was to inspect the tips of the glow plugs. If damaged, then they concluded the valve seats failed. If not damaged, then they would have to disassemble the engine to determine the problem.
By now, most of those engines should have exhibited the failure if they were going to fail and have been fixed
By now, most of those engines should have exhibited the failure if they were going to fail and have been fixed
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There are glow plug tip break off problems and there are cracked valve problems with no damage to glow plugs.
The cracked valve problem was predominantly on the passenger side cylinder heads .
The cracked valve problem was predominantly on the passenger side cylinder heads .
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Post Fiend
Joined: Nov 2001
Posts: 6,748
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From: Tallassee, ALabama
The glow plug tips were never an issue unless there was a valve damage.
The passenger side is the side the PCM/ECM controlled the extra fuel flow to perform a regen. It was the only side that dumped extra fuel for regen. I am not sure as I have never got any clarification if Ford changed this strategy in later updates/engines.
The passenger side is the side the PCM/ECM controlled the extra fuel flow to perform a regen. It was the only side that dumped extra fuel for regen. I am not sure as I have never got any clarification if Ford changed this strategy in later updates/engines.
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