Crankshaft Archives - Page 2 of 6 - UnderhoodService
Misfires In The Crankshaft And Camshaft

Any time you’re dealing with a combustion engine, there’s a chance it will develop a misfire. A better understanding of how computer systems analyze a misfire can make your job that much easier as the service tech.

VIDEO: Crankshaft Position Sensor Diagnosis

Andrew Markel goes over how crank and cam position sensors can fail or send codes due to corrosion, and what to watch for in the voltage before replacing them. Sponsored by Robert Bosch.

The Story Behind The Bundle Of Snakes Exhaust System

When the phrase “bundle of snakes” is uttered about an exhaust system, two cars come to mind: the Ford GT40 and Lotus 38. These were not the first vehicles to use this type of exhaust configuration, but they were the first to be called a “bundle of snakes” and make exhaust systems look more like art than science. These complex exhaust systems were created as a solution to the problem caused by the use of a flat-plane crankshaft.

Timing Belt Replacement On 2.2- And 2.3-Liter Honda Accord Engines

These tips outline the belt replacement for the popular 2.2- and 2.3-liter Accord engines. The other Honda engines are similar, but don’t require the balance belt. They shouldn’t present any challenge to the experienced tech, but there are some things to keep in mind as you tackle these jobs.

Tech Tip: Troubleshooting Common Crank Grinding Problems

Using an improper wheel is most likely to blame for metal particles lodging in abrasive grains or in wheel pores. Try using a wheel with a coarser grit or more open structure to provide chip clearance. Also try using more coolant. Faulty dressing could be another cause of wheel loading. Examine your diamond tool and replace it if it appears to be worn. A worn diamond will appear rounded.

Tech Tip: Audi 2.8L V6 Rear Crankshaft Seal Leaks After Replacement

Oil may leak from the rear crankshaft seal after seal replacement due to the seal lip rolling while installing the new seal. This condition affects 1996 A4 with 2.8L V6 (Engine Code AFC). When replacing the seal, the new seal is supplied pre-installed in the flange.

Tech Feature: Hall Effect Sensor Diagnostics

Hall effect crankshaft position (CKP) and camshaft position (CMP) sensors are critical components of an engine management system. The inputs they provide enable the powertrain control module (PCM) to determine engine speed and position including where a given cylinder is within the four-stroke cycle.

Diagnostic Dilemmas: Approaching No-Code Diagnostics

Thanks to the increasing reliability of modern vehicles, most diagnostic technicians are seeing fewer pattern-failure driveability complaints. For that reason, many techs won’t gamble expensive shop time chasing an illusive no-code driveability complaint. Instead, many will write “no problem found” on the repair order and move on to the next vehicle. Unfortunately, at some point in time, the intermittent, no-code driveability will either be solved or the vehicle will be traded or sold for scrap.

Phaser-Style Variable Valve Timing System Controls And Operation

Phasers commonly can be found on just the exhaust cam or on both the intake and exhaust cams.

Timing Belt Replacement on Jeep’s 2.4L PowerTech Engine

In its short life, the engine was available in the 2002-’06 Jeep Liberty (first generation), as well as the 2004-’06 Jeep Wrangler, but was discontinued when Jeep introduced the Compass and Patriot small crossovers.

Tech Talk: Career Building — Developing Engine Building Experiences in School

Though many high school automotive programs have been cut or reduced in recent years due to funding, community colleges and technical schools are seeing steady enrollment in their automotive programs.

Subaru Outback Head Gasket Repair

The Subaru is a 2002 Outback with 109,982 miles. It has excessive oil leaks from the driver’s side head gasket and some from the passenger’s side. The vehicle had been repaired under warranty by the dealer at about 65,000 miles, and most likely the repairs were done without taking the engine out with probably only one head gasket being replaced. To complete the repair, follow the steps outlined in this article.