6.7 Power Stroke Pushrods: How to Tell When It Is Worn Out
TL;DR: The 6.7L Power Stroke is an overhead-valve pushrod diesel V8, so every valve event travels up a pushrod from a lifter in the block to a rocker arm under the valve cover. Pushrods on this engine rarely wear out on their own - they bend, gall at the ends, or wear their ball and cup, and almost always because something else went wrong first. The tell-tale symptoms are a rhythmic tick that tracks engine speed, a rough or dead cylinder with no fuel-side explanation, or visible slack at one rocker. Confirmation is cheap: pull the valve cover, check for play with that cylinder on base circle, and roll the pushrod on a known-flat surface.
How the 6.7 valvetrain is laid out, and why it matters
The 6.7 Power Stroke carries its camshaft in the block, with lifters riding the lobes and pushrods running up through the cylinder head to rocker arms. It is four valves per cylinder, so a single pushrod and rocker operate a pair of valves through a bridge that spans them. There are no overhead camshafts, no cam followers and no lash adjusters sitting on top of a cam - the geometry is conventional pushrod architecture, just carrying diesel-level spring pressures and cylinder pressures.
That matters for diagnosis in two ways. First, there is a longer mechanical chain between the lobe and the valve than on an overhead-cam engine, and a fault anywhere in it produces broadly similar noise. Second, this is a diesel: there are no spark plugs, no coils and no ignition components in the picture at all. When a 6.7 has a rough cylinder, the usual suspects are fuel-side or mechanical, and the valvetrain sits squarely in the mechanical column.
Pushrods and the hardware around them are listed under pushrods, and the platform catalogue is under 6.7 Powerstroke parts.
The symptoms of a worn, bent or failing pushrod
A rhythmic tick that tracks engine speed. This is the classic. The noise rises and falls with rpm, not with road speed or load, and it is usually loudest from one bank at the top of the engine. Excess clearance anywhere in the valvetrain produces it - a worn pushrod end, a collapsed lifter, a worn rocker, or a bent rod that is no longer taking the full stroke.
A rough or misfiring cylinder with no fuel-side cause. A pushrod that has bent significantly loses effective length and stops opening its valves fully, or at all. The result is a cylinder that contributes poorly or not at all. On a modern common-rail truck this usually shows up as a running complaint and stored fault data pointing at cylinder contribution or balance, with injector testing coming back clean. If the fuel side checks out and one cylinder is still down, the valvetrain is the next place to look.
Visible slack at one rocker with the valve cover off. With that cylinder's lobe on base circle, a healthy assembly is snug. A pushrod you can wiggle laterally, lift vertically, or rotate freely when its neighbours will not is telling you something is worn or collapsed.
A performance complaint that arrived suddenly rather than gradually. True wear is gradual. A bend is an event. If a truck was fine on Friday and has a tick and a rough cylinder on Monday, you are looking for something that failed, not something that wore.
The bench checks that actually confirm it
Diagnosis on this engine is cheap compared with the repair, so do it properly before ordering anything.
| Check | What you are looking for | What it rules in |
|---|---|---|
| Rocker play, lobe on base circle | Any lateral wobble, vertical lift, or free rotation of the pushrod | Excess clearance somewhere in that cylinder's valvetrain |
| Roll the pushrod on flat glass or a surface plate | Any daylight under the rod as it rolls; any wobble in the roll | A bent pushrod - the single most common finding |
| Inspect both ends under good light | Galling, scoring, blueing, flat spots, an out-of-round ball or an ovalled cup | Oil starvation or an overload event at that end |
| Compare rod to rod | One rod visibly different in end condition from the others | A localised fault rather than general wear |
| Rocker, bridge and valve tip condition | Wear in the rocker socket, a cocked bridge, hammered valve tips | The cause, not just the symptom |
| Cut the oil filter and spread the media | Bright metal flakes, needle-roller fragments, a metallic sheen | A lifter or cam failure upstream - stop and reassess |
The rolling check is the one that settles most cases. A pushrod is a straight rod, and a bent one shows itself immediately on a flat reference surface. Do not eyeball it against a workbench edge and call it good; use something you know is flat.
Two things to note on end wear. Galling, blueing or a flattened ball almost always means that end was running dry or overloaded, and simply fitting a new rod without understanding why does not fix anything. And an ovalled cup at the top means the rocker socket has been working against it - inspect the rocker arms at the same time, because replacing one half of a worn pair leaves you with a new part running against a damaged mating surface.
What a bad pushrod is usually telling you
This is the part most owners skip. On a 6.7 Power Stroke, a bent or worn pushrod is nearly always a symptom rather than a root cause. The rod is deliberately the softer link in the chain - it deforms so that something more expensive does not.
The common upstream causes:
A dropped or collapsed lifter. If a hydraulic element has failed or a roller has come apart, the pushrod above it takes abnormal loading and can bend or hammer its ends. This is why cutting the oil filter open matters: metal in the media points at the lifter or the camshaft, and fitting new pushrods over a wiped lobe is throwing parts at a problem you have not found. Lifters and the associated hardware sit under valves and valvetrain and camshafts.
A valve that stopped moving freely. A stuck valve, a broken spring, carbon buildup on a stem, or a bridge that has cocked in its guide all present the pushrod with a load it was never designed to take. The rod bends. Fit a new one against the same obstruction and it bends again.
An overspeed or over-rev event. Valve float at rpm the engine was not meant to see, or a downshift error, can bend rods across several cylinders at once. Multiple bent rods is a strong signal that the cause was an event rather than component wear.
Assembly error after previous work. A rod that missed its seat in the rocker socket or the lifter cup on reassembly bends within minutes of the first start. If a valvetrain job was done recently and a tick appeared immediately afterwards, this is where to look first.
The working rule: find out why before you buy the replacement. A set of pushrods is one of the cheaper things you will ever buy for this engine. The teardown to fit them is not, and doing it twice because the real fault was upstream is the expensive mistake on this platform.
Replacing them, and what else to do while you are in there
Replacement itself is straightforward relative to the diagnosis. The valve cover comes off, the rockers come loose, the rods come out. The judgement calls are around it.
Replace as a set on a high-mileage engine rather than fitting one new rod among fifteen used ones - mixed wear across the set gives you inconsistent geometry, and the cost difference is small compared with the access. Inspect every lobe you can see and every rocker and bridge before anything goes back together. If a lobe is scored or spalled, the job just became a camshaft and lifter job and there is no useful shortcut around that.
Prelube the ball and cup ends and the rocker sockets before assembly. Make absolutely certain each rod is seated in both its lifter cup and its rocker socket before anything is tightened - this is the single most common way a fresh pushrod gets bent, and it happens on the first start. Torque every fastener in the factory sequence to the value published in the Ford service manual for your model year and application; do not carry a figure over from another engine or another year. Confirm the current pushrod part number for your specific application against the manufacturer catalogue before ordering, because length and end configuration are application-specific and superseded numbers are common on this platform.
Change the oil and filter after the repair regardless of how recently it was done, and cut that first filter open before you throw it out. If there was any debris from the original failure, that is where it shows up. Consumables and the rest of the diesel catalogue are under diesel engine parts.
Frequently Asked Questions
Can a 6.7 Power Stroke run with a bent pushrod? Often, yes - and that is the risk. A partially bent rod still opens the valves, just not fully or on the correct schedule, so the truck runs rough rather than stopping. Continuing to drive it lets the underlying cause keep working on the rest of the valvetrain, and a rod that is bending progressively can eventually come out of its seat. Diagnose it rather than living with it.
How do I check a pushrod for straightness without special tools? Roll it on a piece of flat glass or a surface plate under good light and watch for daylight under the rod or wobble in the roll. A straight rod rolls smoothly and stays in contact along its length. This check finds the large majority of bent rods and costs nothing.
Should I replace all the pushrods or just the bad one? On a low-mileage engine with a clear single-event cause and no wear on the others, one rod is defensible. On a high-mileage engine, or where end wear is visible across several rods, replace the set. The parts are the cheap part of the job and mixed wear across the set gives you inconsistent valvetrain geometry.
Does a ticking noise always mean a pushrod problem? No. A tick that tracks engine speed narrows it to the valvetrain, but the specific cause could be a collapsed lifter, a worn rocker, a loose rocker fastener, a worn valve bridge, or the pushrod itself. Pull the cover and inspect before ordering parts - the noise tells you where to look, not what to buy.
Do 6.7 Power Stroke pushrods have anything to do with glow plugs or injectors? No. Glow plugs handle cold start and injectors handle fuelling; neither is mechanically connected to the valvetrain. They matter to diagnosis only because a rough-running cylinder needs the fuel side ruled out before you conclude the fault is mechanical. There are no spark plugs or ignition coils on this engine at all.
If I find one bent pushrod, do I need to pull the engine apart further? Not necessarily, but you must find the cause first. Check the lifter under it for collapse or roller damage, check that the valves move freely, check the rocker and bridge, and cut the oil filter open. If everything upstream is clean and the valves move freely, a single bent rod from a one-off event can be replaced and the engine closed up. Metal in the filter or a scored lobe means the job is bigger.
Sources
Written from the Core Powertrain Parts technical reference for the 6.7L Power Stroke valvetrain and from our internal diagnostic procedure for pushrod and rocker inspection. Engine architecture details reflect the published Ford service documentation for the platform. Torque values, part numbers, pushrod lengths and service intervals are deliberately not reproduced here - confirm those against the Ford service manual for your model year and application, and against the catalogue of the manufacturer whose parts you buy. Labour figures reflect ranges commonly quoted by independent diesel shops for valve cover access on this engine and vary by shop and region.
Questions on a specific application: sales@coretransmissionparts.com. Orders over $70 ship free.