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Main Bearing Bolt Caution for 2007-2017 Jeep 2.4L Engines |
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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. |
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Broken Piston Rings and Misfire on 2011-2019 GM 1.4L LUV and LUJ Engines |
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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. |
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Anatomy of a Performance Engine Bearing |
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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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Subscribe to the AERA YouTube Channel |
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The AERA YouTube channel features Prosis Pro tutorials, AERA webinars and membership information. We invite you to check out the wide selection of videos and subscribe! New content is added regularly. |
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Podcast Episode 16 API Engine Oils |
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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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Not an AERA Member? Join today! |
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Become an AERA member today and start enjoying the benefits of one of the oldest and most respected technical organizations in the world. You’ll have full access to a wealth of information, knowledge and training… plus much more! |
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This message contains privileged and confidential information intended only use of the addressee. If you are not the intended recipient of this message, you are hereby notified that you may not disseminate, copy or take any action based on the contents thereof; and are kindly requested to inform the sender immediately. Any views expressed in these messages are those of the individual sender, except where the sender specifically states them to be the view of the Retail Motor Industry Organisation. While every care has been taken in preparing this document, no representation, warranty or undertaking (expressed or implied) is given, and neither responsibility nor liability is accepted by any member of the Retail Motor Industry Organisation as to the accuracy of the information contained herein, or for any loss arising from reliance on it.
