Main Bearing Bolt Caution for 2007-2017 Jeep 2.4L Engines
The AERA Technical Committee offers the following information regarding the main bearing bolts used on 2007-2017 Jeep 2.4L engines. These engines use different main bearing bolts during factory assembly and the characteristics and torque values are specific to each design. Using the correct design and torque values is critical to complete a successful repair.
CAUTION: This engine has been built with two different designs of main bearing bolts with different markings. Each style bolt requires a unique torque value. The bolts can be identified by viewing the bolt top as shown in Figure 1.
Broken Piston Rings and Misfire on 2011-2019 GM 1.4L LUV and LUJ Engines
The AERA Technical Committee offers the following information on broken piston rings and misfire on 2011-2019 GM 1.4L LUV and LUJ engines. These turbocharged engines are used in Cruze, Trax, Sonic and Encore vehicles.
Drivers of these vehicles may complain of lack of power and oil consumption and there may be a diagnostic trouble code PO300 (engine misfire) stored. The misfire(s) may be caused by lack of compression in one or more cylinders caused by broken or stuck piston rings. Often times, a cylinder head ends up being sent to a machine shop before the cause of a misfire was determined.
Anatomy of a Performance Engine Bearing
Professional engine builders take great pride in the work they turn out and are knowledgeable about the multitude of components that make up a performance engine. Of all the many important parts used in a performance engine, perhaps the least understood are the most critical: the crankshaft main and connecting rod bearings. This article reviews the anatomy of performance engine bearings and why it is important to use bearings that are made of the proper material and construction to ensure reliable operation
on the street, track and strip.
An engine bearing is not designed to contact the crankshaft journals. The journals do not ride on the bearing surface: they ride on a “wedge” of oil created by the bearing. This is referred to as
hydrodynamic lubrication. The role of the bearing is to form the oil wedge that supports the journal.
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Podcast Episode 16
API Engine Oils
Chuck Lynch and Dave Hagen interview Jeff Harmening from the American Petroleum Institute (API). Jeff explains licensing of engine oils, proper storage and handling, engine oil specifications, diesel engine oils, and what should engine builders expect with new engine oils. Steve and Chuck also discuss the Ford Flathead V8 engine during the history segment of the podcast. They also let you know about the upcoming AERA Regional Tech & Skills Conferences.
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