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Camshaftreplacement cost

New parts in hand, Sanchez started to mock-up the cam in the block, putting a guided lifter pair on the No. 1 intake and exhaust lobes, and then began installing the timing chain.

Forget the Abec ratings, they actually mean almost nothing. The lubricant is the difference maker. Shiver's bearings are manufactured to the highest standards ...

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For a better idea of what a bad wheel bearing sounds like, this video has a few examples of how a bad wheel bearing sounds.

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Sanchez quickly found the distributor was 180 degrees out of phase. "After I straightened out the distributor," Sanchez says, "The engine would run, but very rough, like it was firing on only seven cylinders. It didn't sound all that bad for what, at the time, I thought was a pretty big cam, and the idle system on entry-level carbs can't always play happy with a raggedy cam. Maybe I could make things better with careful adjustments, so I looked at the spark plugs. The No. 1 plug was wet and smelled of fuel; it wasn't burning. The other plugs looked OK.

Jul 22, 2022 — Here is a short video showing how to easily replace a front wheel bearing without a press or slide hammer. In my view, this is the easiest ...

Some sources attribute this to lower cruise rpm (and hence lower sustained oil pressure) from mild rear axle ratios and overdrive transmissions used to meet tightening mileage and emissions standards. Regardless of the cause, Godbold claims, "Over hundreds of thousands of cars, flat-tappet cam and lifter failures were costing GM, Ford, and Chrysler on the order of over $100 per car on warranty and repair claims."

In sum, durability, not performance, was the initial impetus for the OEs' switch to roller tappets. Later, as carmakers got a handle on emissions and mileage, they developed a new generation of detonation-resistant fast-burn heads that worked with higher compression ratios and new high-lift roller cam profiles that can't be duplicated using flat-tappet technology. Bottom line: Go with a hydraulic roller cam if you can afford it, both for performance as well as reliability.

Every engine has a different tolerance stack up, so it's always good practice to dial-in the cam in a high-performance build. Comp's billet steel crank gear may have "only" three keyways, but that was enough to degree the cam within degree of the timing card's 0.050-inch tappet-lift intake/exhaust timing events by installing the bottom gear in the 4-degrees advanced position (4 degrees advanced at the crank equals 2 degrees advanced at the cam).

Flat tappet cams can be damaged by using modern engine oils that lack zinc and associated anti-scuff additives. Zinc can damage catalytic converters, so it's slowly been eliminated in modern engine oil that conforms to the latest API standards. That's not much of a problem for most engines newer than the late '80s and early '90s, by which time the auto manufacturers had fully converted to some sort of roller cam follower. Big problems arise when using this oil in an engine with a flat tappet cam that was designed for oil with high levels of anti-wear compounds. It's very easy to flatten a cam, and the only fix is to replace it and the lifters.

When a wheel bearing wears out, it can make a grinding, rubbing, or scraping noise from the wheel while driving as the internal parts wear and cause more resistance. This can increase in sound volume the longer it goes unreplaced.

To be honest, we're kind of jaded on flat-tapped hydraulic cams, generally. Today's retail consumer "starburst" motor oils lack the critical ZDDP zinc compound necessary for keeping flat-tappet lifters alive with today's modern cam profiles. Comp Cams' Valvetrain Engineering Group Leader Billy Godbold affirms this, saying, "You can do everything right to reduce the number of flat-tappet cam failures, but you cannot bring that number to zero."

One way to confirm which wheel bearing is bad is to check it with a stethoscope. With the vehicle running up in the air, listening with a stethoscope pressed against the wheel knuckle can pinpoint which wheel bearing is making noise

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Bad camshaftsound

"Valvetrain assembly error"? Now you're getting warm. Before disassembling the cam and upper valvetrain, Sanchez noticed uneven valve stem tip wear across several valves. The worst misalignment was over the failed lobe, although we don't have proof beyond a reasonable doubt this was the proverbial smoking gun. Unfortunately, the only fix for a flattened cam is to replace it and the lifters with a new one, and it's at this point that most people switch to a roller cam.

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How long can you drive with abad camshaft

On many vehicles, the wheel bearing is included with the wheel hub as a wheel hub assembly. This means if the wheel bearing is bad, the whole wheel hub assembly might need to be replaced.

A subscription to Car and Driver at age 10 set the stage for what would be John's career path. A voracious reader of car magazines and lover of all things automotive, he set out to learn as much as he could about cars. An automotive technology program provided the foundation, while fumbling around with large American sedans provided real world experience. Finally, a Bachelor of Science degree in photojournalism provided the focus. John accepted a five-month photography internship at Motor Trend magazine in 2003. Upon completion, he remained with the publishing company, managing a photo studio for 18 months before becoming photo editor for HOT ROD and Car Craft magazine. After three years on the production side, John accepted an editorial position at Car Craft in December 2006 and eventually became editor of Car Craft in 2014 and retained that position until March 2018 when he moved to HOT ROD as Executive Editor. He was promoted to Editor-in-Chief of HOT ROD in April 2019.

Any time you have a cam failure, a bottom-end inspection is also in order because all the debris from the failed lifter and cam lobe must go somewhere. The gunk in Hicks' oil pan didn't look good, so Sanchez prepared for the worst.

Godbold gave us several cam options, including a racy-sounding Thumpr. "Power-wise, nothing should beat the Thumpr on top with a Cleveland's 1.70:1 stock rocker ratio," elaborates Godbold. "Its 107-degree LSA [lobe separation angle] is a little difficult with vacuum and idle characteristics than what you would have with a wider, 109- to 113-degree LSA. For those who want a smoother-idling grind, our brand-new HLO profiles, originally developed for LS engines, would be perfect—but that would be a custom grind for a Cleveland. In an HLO, something about 227/239-degrees at 0.050 ground on about a 111-degree LSA would be very good." Owner Hicks had to have a racy idle, so Thumpr it was.

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"The Number 1 cylinder wasn't firing. The plug wire checked OK. I pulled the valve cover and cranking the engine over with a bump-start switch, I saw the Number 1 intake valve was barely moving. Turning the lash adjuster nut made no difference. The pushrod wasn't bent, so the next thing was to look at the cam and lifters. Number 1 lifter was not slack in the bore, indicating to me there wasn't excessive lifter-bore wear."

On many vehicles, the anti-lock brake system (ABS) is a part of the wheel hub, and if this malfunctions, the entire wheel hub assembly and wheel bearing will need to be replaced.

So, what was the root cause? Some might say "oiling." But Sanchez points out the Cleveland's Number 1 intake lobe gets oiled first, so if there was a lack of lubrication, then everything downstream—including all the other cam lobes, as well as main and rod bearings—should have had even worse problems.

What does abad camshaftlook like

If you hear a groaning, rubbing, whirring, knocking, or grinding noise when driving your car, it could mean you have a bad wheel bearing. Since wheel bearings are usually built as a part of the wheel hub assembly, it likely means the whole wheel hub assembly needs replacing. This article will explain the signs of a bad wheel bearing, what causes a bad wheel bearing, and how to diagnose and replace a wheel bearing or wheel hub assembly yourself.

Badcrankshaftsymptoms

You can feel and hear a bad wheel bearing with a simple test at the tires. Raise and secure the vehicle. Grab the tire from the 12 and 6 o’clock position. Press the tire in and out. Test and feel for any excessive movement or looseness.

We also needed to make sure any mechanical fuel pump could keep up with the engine's 450hp-plus projected power output, with ample overhead for the usual "mission creep." The problem is the big names don't make (at least not anymore) a truly high-volume Cleveland mechanical fuel pump. Clevelands used to be popular in carbureted oval-track racing back before the SVO hybrid blocks, and that's why niche specialists like RobbMc exist. It has an interesting line of unique problem-solvers, including the only currently available true high-output Cleveland mechanical fuel pumps (right). It supports up to 550 hp at 7 psi without a regulator. It features big NPT side inlet and bottom outlets, a small NPT bottom port for a vapor return or fuel pressure-gauge line, and a 180-degree-rotatable valve body. This is plenty for Hicks' engine, but an 1,100hp version is also available (that one does need a regulator). There's even a $100 upgrade kit for existing 550hp models, so there's no need to spring for a whole new 1,100hp pump if your power needs keep climbing.

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A subscription to Car and Driver at age 10 set the stage for what would be John's career path. A voracious reader of car magazines and lover of all things automotive, he set out to learn as much as he could about cars. An automotive technology program provided the foundation, while fumbling around with large American sedans provided real world experience. Finally, a Bachelor of Science degree in photojournalism provided the focus. John accepted a five-month photography internship at Motor Trend magazine in 2003. Upon completion, he remained with the publishing company, managing a photo studio for 18 months before becoming photo editor for HOT ROD and Car Craft magazine. After three years on the production side, John accepted an editorial position at Car Craft in December 2006 and eventually became editor of Car Craft in 2014 and retained that position until March 2018 when he moved to HOT ROD as Executive Editor. He was promoted to Editor-in-Chief of HOT ROD in April 2019.

Along with the cam, Godbold sent us a complete upper valvetrain including: springs, retainers, valve seals, and high-tech Pro Magnum roller rocker arms.

But, It turns out that the front face of Cloyes' billet chain isn't machined for a two-piece cam eccentric. Both one-piece and two-piece mechanical fuel pump eccentrics are available for Windsor small-blocks, but neither works on a Cleveland that uses its own unique two-piece configuration. Short of custom-machining the upper sprocket for clearance, the obvious solution is an electric fuel pump. Hicks wanted to keep the Mustang as visually "stock" as possible, so we went with Comp's rendition of a roller chain that uses a billet-steel crank gear but a cast-iron cam gear. Being iron, Comp's upper is OK with a stock thrust plate.

Dan Hick found this out first-hand after rebuilding the Ford 351C stroker engine in his 1973 Mustang convertible. Upon startup, the cam almost immediately went flat. It wouldn't idle properly and eventually didn't run at all. He took the car to Mark Sanchez, Ford Specialist and owner of Advanced Engineering West, who got to work diagnosing the problem.

... seals. There is an interchange equating SKF oil seals to competitors part numbers, another feature is the ability to identify a seal by user inputed ...

But pulling that Number 1 lifter, I saw a ground-off foot. The corresponding Number 1 intake lobe on the cam was worn nearly round," Sanchez exclaimed

Not that flat-tappet cam failures were unknown 40 years ago. Even back in the '80s, when lifters and oil were still "good," Godbold maintains, "U.S. automakers were seeing too many unexplained cam failures that cost them more to fix than the upgrade to a roller tappet would cost." And that's with mild OE smog-era cams.

Bye-bye Number 1 intake cam lobe. Lifter trouble is afoot when it's lost its crown. The Number 1 lifter (left) is ground down so far, it's breaking into the hydraulic mechanism's center cavity. For some expert analysis, Sanchez sent the cam, lifters, pushrods, springs, and retainers to Comp Cams for inspection. Everything checked out OK, with Comp reporting, "There was no apparent reason for the failure."

Wheel bearings sit on the wheel hub on “races” that allow it to spin. When a wheel bearing goes bad from normal wear and tear, lack of grease on the bearing, or elements getting inside, it will have more resistance when spinning. This can create a scraping or grinding noise when driving or when turning the front or rear wheels. As the internal parts wear down, the bearing creates more “play,” which can sometimes be felt in other parts like the steering wheel. The wheel hubs will also become exceptionally hot from the extra friction which could cause more damage to the hub and internal components.

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Too much “play” in the wheel bearing can make the steering feel loose as the wheel hub gets less effective at turning from wear and tear. Sometimes tire vibrations can be felt in the steering wheel as the worn parts of the bearing start to grind.

Bad wheel bearings might also make a groaning or rubbing noise when turning—another sign the wheel bearing is bad and is affected by the vehicle shifting weight.

Worncamshaftlobesymptoms

Showing only minor normal wear, the main and rod bearings were fortunately reusable. The oil pump was another story, with scored internal gears. Sanchez replaced it with a Melling high-volume pump, transferring over the old screen after a thorough cleanup.

Here's where unanticipated problems started to rear up: Cloyes offers a bulletproof 9-keyway billet-steel True Roller timing set, but it requires a steel thrust plate. "You can't put a steel sprocket on a stock Ford cast-iron thrust plate without excessively wearing the plate," Sanchez explains. Clevelands are a dying breed here, but they remain popular down under, where Australia's Aeroflow makes a steel plate. OK, problem solved

In researching timing sets, eccentrics, thrust plates, and high-output mechanical fuel pumps, we came across some reports that Ford-factory (or equivalent replacement) eccentrics—whether one- or two-piece—can't reliably do the job on high-output engines with high-volume mechanical fuel pumps. Metal-on-metal contact between the eccentric and the pump's lever-arm causes horsepower-robbing friction plus accelerates pump-arm wear, a problem compounded by the stiffer lever-arm spring used in high-volume pumps. Under sustained high-rpm use, the lever may even go into bounce. The solution is HiPo Parts rollerized eccentric. PN HPEX-6287-CLV fits 351C, 351M, and 400M. It includes an ARP 12-point bolt. Ease pump installation by installing the pump arm on the low side of the eccentric (TDC, cylinders 2 or 6 on the compression stroke).

Bad camshaftsensorsymptoms

Sanchez's plan was to correct the guideplate misalignment and replace the entire valvetrain with one compatible with a modern roller cam profile that matched the Cleveland heads' top-end flow characteristics. To do justice to the stroker engine's 42 more cubic inches over a standard 351, Hicks really needed to step-up from the original cam's 218/224-degrees duration at 0.050-inch tappet lift.

Save on a wheel bearing repair by fixing it yourself. Learn how to properly remove and install a new wheel bearing or wheel hub assembly on your vehicle with 1A Auto’s how-to videos.

Spin the wheel/tire and place a hand on the strut’s coil if the vehicle has coil-over struts. Sometimes you can feel the wheel bearing reverberating on the coil with one hand while the wheel is spinning. Sometimes you can hear the grinding noise from the wheel or tire when spinning it.