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.

For help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, see the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.

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.

"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.

What are the ways to reduce friction? Friction can be reduced by polishing surfaces, using lubricants, using ball bearings, or making surfaces more streamlined.

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If directed request support for TACACS+ or RADIUS is not required, the CLI commands tacacs-server directed-request and radius-server directed-request can be removed from the configuration. If the commands are not present in the configuration, the device is not vulnerable.

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.

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."

SKF-Bearing SNW 128X4.15/16. MODEL SNW 128X4.15/16. BRAND. SKF Bearing. SKU. 325039. WEIGHT. 13.177 lb. UOM. each. Sending Request to Vendor. $342.33 Each.

Broken camshaft causes

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Cisco MDS Series SwitchesCisco Nexus 1000V for VMware SwitchCisco Nexus 3000 Series SwitchesCisco Nexus 5500 Platform SwitchesCisco Nexus 5600 Platform SwitchesCisco Nexus 6000 Series SwitchesCisco Nexus 7000 Series SwitchesCisco Nexus 9000 Series SwitchesCisco Nexus 9000 Series ACI-Mode Switches

The impact gun will damage the axle nut. It will also leave your spindle nut under or over torque resulting in hub assembly failure. To ensure that you have the ...

What does abadcamshaft look like

Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

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.

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.

Assembled seal for high-pressure applications. GYLON® element offers excellent chemical resistance.

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

If the affected device reloads, the Authentication, Authorization, and Accounting (AAA) portion of the configuration may be deleted, which would prevent valid users from authenticating. The AAA configuration would need to be manually reconfigured.

Aug 11, 2020 — For the Dana 60 up front some info suggests that an NLGI #2 is best while other info specs an NLGI#2 with a Moly additive--percent varies.

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).

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.

To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

A vulnerability in TACACS+ and RADIUS remote authentication for Cisco NX-OS Software could allow an unauthenticated, local attacker to cause an affected device to unexpectedly reload.

Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.

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.

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

May 13, 2023 — The average pricing range can stoop as low as $107-$147 (DIY) to as high as $400-$1000 (mechanic) – depending on whether you prefer DIY procedures or mechanic ...

To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to search for vulnerabilities that affect a specific software release. To use the form, follow these steps:

Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

To help customers determine their exposure to vulnerabilities in Cisco NX-OS Software, Cisco provides the Cisco Software Checker. This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories that the Software Checker identifies (“Combined First Fixed”).

Note: This vulnerability can only be exploited over Telnet, which is disabled by default, or over the console management connection. This vulnerability cannot be exploited over SSH connections to the device.

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

Bent camshaftsymptoms

Badcamshaft sensorsymptoms

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.

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.

While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

"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."

To determine if the directed request option is configured for TACACS+ or RADIUS, use the show running-config | include directed-request command. If the command returns tacacs-server directed-request or radius-server directed-request, the device may be affected by this vulnerability. The following example shows the output of the show running-config | include directed-request command on a device that has the directed request option configured for TACACS+:

Cisco has released free software updates that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.

Badcamshaft sound

A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.

To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Worn camshaft lobesymptoms

Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.

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.

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.

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.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is part of the August 2023 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2023 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

The classic symptom of a bad wheel bearing is typically a cyclic chirping, squealing or growling noise that changes in proportion to vehicle speed. The sound ...

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.

The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.

This vulnerability is due to incorrect input validation when processing an authentication attempt if the directed request option is enabled for TACACS+ or RADIUS. An attacker could exploit this vulnerability by entering a crafted string at the login prompt of an affected device. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.

Camshaft replacement cost

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."

This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco NX-OS Software with the directed request option enabled for TACACS+, RADIUS, or both:

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Cisco Nexus 9000 Series NX-OS Security Configuration Guide: Configuring TACACS+Cisco Nexus 9000 Series NX-OS Security Configuration Guide: Configuring RADIUS

Cisco has released the following SMUs to address this vulnerability. Customers can download the SMUs from the Software Center on Cisco.com.

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.

How long can you drive with abadcamshaft

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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).

To determine the best release for Cisco UCS Software, see the Recommended Releases documents in the release notes for the device.

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.

Cisco Nexus 9000 Series NX-OS Security Configuration Guide: Configuring TACACS+Cisco Nexus 9000 Series NX-OS Security Configuration Guide: Configuring RADIUS

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."

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

For details about downloading and installing SMUs in Cisco NX-OS Software for Cisco Nexus 3000 and 9000 Series Switches, see the Performing Software Maintenance Upgrades section of the Cisco NX-OS system management configuration guides for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches.

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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.