{"id":14484,"date":"2026-06-09T16:11:32","date_gmt":"2026-06-09T16:11:32","guid":{"rendered":"https:\/\/www.xtremediesel.com\/blog\/?p=14484"},"modified":"2026-06-09T20:09:23","modified_gmt":"2026-06-09T20:09:23","slug":"6-7l-ram-lifter-failure-causes-symptoms-fixes-explained","status":"publish","type":"post","link":"https:\/\/www.xtremediesel.com\/blog\/2026\/06\/09\/6-7l-ram-lifter-failure-causes-symptoms-fixes-explained\/","title":{"rendered":"6.7L Ram Lifter Failure: Causes, Symptoms, and Fixes Explained\u00a0"},"content":{"rendered":"\n
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If\u00a0you\u2019ve\u00a0spent any time in diesel groups or forums online,\u00a0you\u2019ve\u00a0probably seen\u00a0people talking about lifter issues in\u00a02019-2024\u00a0Ram HD trucks equipped with the 6.7L Cummins engine.\u00a0Some owners have racked up serious miles without a problem, while others have dealt with worn lifters, damaged camshafts, and expensive repairs much earlier than expected.\u00a0\u00a0\u00a0<\/p>\n\n\n\n

For many long-time Ram diesel owners,\u00a0that\u2019s\u00a0the\u00a0frustrating\u00a0part. Earlier generations of the 5.9L and 6.7L trucks earned a reputation for durability measured in hundreds of thousands of miles, which is why newer hydraulic lifter failures have become such a hot topic in the diesel community.\u00a0\u00a0<\/p>\n\n\n\n

What Changed in the Valvetrain of the 2019-2024 Ram 6.7L Diesel Engine?\u00a0\u00a0<\/h2>\n\n\n\n

For decades, Ram trucks equipped with the\u00a0Cummins diesel\u00a0engine\u00a0relied on a flat tappet valvetrain design dating all the way back to the early 12-valve engines.\u00a0From the legendary 5.9L trucks of the 1990s and early 2000’s to later 6.7L models,\u00a0flat tappets were the standard, delivering simplicity, durability, and proven long-term reliability in\u00a0heavy-duty diesel applications.\u00a0\u00a0<\/p>\n\n\n\n

That changed in 2019 when hydraulic roller lifters were introduced in\u00a0the\u00a0Ram\u00a06.7L\u00a0engines. The\u00a0change to hydraulic roller lifters in\u00a05th\u00a0generation\u00a0Ram HD trucks is associated with improved efficiency, reduced valvetrain friction, and quieter operation.2\u00a0<\/sup>\u00a0\u00a0<\/p>\n\n\n\n

Unlike flat tappets, which slide directly across the camshaft lobes, hydraulic roller lifters use a small wheel that rolls along the camshaft surface. This reduces friction, helps improve efficiency, lower drag, and contributes to emissions and fuel economy improvements. Hydraulic lifters also use engine oil pressure to maintain zero valve lash, which can reduce valvetrain noise and lessen the need for periodic adjustment.2<\/sup> <\/p>\n\n\n\n

The trade-off for these gains in efficiency and friction reduction is increased valvetrain complexity and sensitivity to operating conditions. Unlike flat tappet designs, hydraulic roller lifters rely on a roller assembly with needle bearings along with an internally pressurized hydraulic plunger. This added complexity improves performance and refinement, but also introduces more potential failure points and places greater dependence on proper lubrication and oil quality.\u00b9  <\/p>\n\n\n\n

Reported failure patterns often begin when the lifter no longer functions as intended. If the roller stops rotating, often due to internal needle bearing failure, it can begin dragging across the camshaft lobe instead of rolling smoothly, creating friction and heat. Under the high loads found in heavy-duty diesel engines, wear can accelerate quickly once this occurs.2<\/sup> <\/p>\n\n\n\n

As damage progresses, the camshaft and lifter can begin wearing each other rapidly, sending metal debris through the engine oil. In more severe cases, this contamination can circulate through the lubrication system and affect other oil-lubricated components, including the engine\u2019s main and connecting rod bearings, and potentially the turbocharger. Left unaddressed, what may start as a faint ticking noise can develop into significant valvetrain damage or more extensive engine issues.2<\/sup> <\/p>\n\n\n\n

How Do Oil Quality and Maintenance Affect the 6.7L Lifter Life?<\/strong> <\/h2>\n\n\n\n

As with any modern valvetrain system, proper oil viscosity, maintenance intervals, oil quality, and running quality filters all play an important role in long-term component life.1,<\/sup>4<\/sup>  <\/p>\n\n\n\n

From the factory, 2019-2024\u00a0Ram\u00a06.7L engines are designed to run on\u00a0SAE 10W-30 engine oil<\/strong><\/a>\u00a0(meeting modern diesel oil standards such as API CK\u20114), with 5W\u201140 full synthetic acceptable for severe duty or extreme temperatures.\u00a0<\/p>\n\n\n\n

A Technical Service Bulletin (TSB) from Stellantis underscores the sensitivity of the updated hydraulic valvetrain to oil formulation and viscosity, noting that the requirements differ from those of earlier flat tappet-equipped Cummins engines. <\/p>\n\n\n\n

 A Technical Service Bulletin from Stellantis warns1<\/sup>:  <\/h3>\n\n\n\n
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\u201c15W-40 grade oil CAN NOT be used in any 2019 model year or newer 6.7L equipped vehicles due to the new designed valve train of this engine. If this oil is used, it will cause deposits to form in the Hydraulic Valve Lash Adjusters leading to undesirable noise, and\/or engine damage.\u201d <\/p>\n<\/blockquote>\n\n\n\n

What Are The Signs of Lifter Failure in the 6.7L Engine?<\/h2>\n\n\n\n

Failing lifters often present several recognizable warning signs before the problem progresses into more serious mechanical damage: <\/p>\n\n\n\n