{"id":14954,"date":"2026-09-21T16:36:24","date_gmt":"2026-09-21T16:36:24","guid":{"rendered":"https:\/\/www.xtremediesel.com\/blog\/?p=14954"},"modified":"2026-09-21T20:49:32","modified_gmt":"2026-09-21T20:49:32","slug":"the-evolution-of-fords-6-7l-powerstroke-ccv-system","status":"publish","type":"post","link":"https:\/\/www.xtremediesel.com\/blog\/2026\/09\/21\/the-evolution-of-fords-6-7l-powerstroke-ccv-system\/","title":{"rendered":"The Evolution of Ford\u2019s 6.7L Powerstroke CCV System"},"content":{"rendered":"\n
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Since the 6.7L Powerstroke debuted in 2011, Ford has revised its Closed Crankcase Ventilation (CCV) system several times. We’re going to look at four of the main OEM CCV designs used throughout the life of the 6.7L Powerstroke.  <\/p>\n\n\n\n

At XDP, we’ve stocked multiple generations of Ford’s OEM CCV assemblies, which gives us a good look at how the system has changed throughout the life of the 6.7L Powerstroke.\u00a0\u00a0<\/p>\n\n\n\n

So, what’s different from one generation to the next?   <\/p>\n\n\n\n

To find out, we dug into the history of Ford’s CCV system, compared the different assemblies, reviewed discussions from experienced Powerstroke owners and technicians, and took a closer look at independent teardown comparisons of the different designs.  <\/p>\n\n\n\n

Here’s what we found.  <\/p>\n\n\n\n

First Things First: What Does the CCV System Do?<\/strong> <\/h2>\n\n\n\n

Every diesel engine experiences a little blow-by. During combustion, some gases escape past the piston rings and enter the crankcase. Those gases create crankcase pressure and can carry oil mist with them. If the system isn’t properly vented, excessive crankcase pressure can contribute to oil leaks and other engine concerns.  <\/p>\n\n\n\n

That\u2019s where the Closed Crankcase Ventilation (CCV) system comes in. The CCV assembly separates oil mist from those blow-by gases before routing the cleaned vapors back into the engine\u2019s intake. The collected oil drains back into the crankcase while the vapors are routed back into the engine. It\u2019s not the flashiest component on your truck, but it\u2019s an important one.  <\/p>\n\n\n\n

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Why Does the CCV Need Maintenance?<\/strong> <\/h2>\n\n\n\n

Like many engine components, the CCV system doesn\u2019t last forever. Depending on the model year and application, Ford used both sealed CCV assemblies and versions with a replaceable crankcase vent (coalescer) filter element.   <\/p>\n\n\n\n

On versions equipped with a replaceable filter, the filter can become more restrictive as contaminants accumulate, reducing the CCV system\u2019s ability to properly vent crankcase pressure. Other versions use a sealed, non-serviceable assembly rather than a replaceable filter.  <\/p>\n\n\n\n

As you\u2019ll see below, that\u2019s just one of the several changes Ford made to the CCV system over the different generations of the 6.7L Powerstroke.  <\/p>\n\n\n\n

Symptoms of a Restricted CCV Filter<\/strong> <\/h2>\n\n\n\n

Over time, the crankcase vent filter can collect enough contamination that it starts to restrict airflow. When that happens, the CCV system may not be able to relieve crankcase pressure as effectively as it should.  <\/p>\n\n\n\n

Ford has linked a restricted CCV filter to: <\/p>\n\n\n\n