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AERA Technical Bulletins – April 4, 2022



Cylinder Head and Glow Plug Caution on 2001-2022 GM Duramax 6.6L Diesel Engines


The AERA Technical Committee offers the following information on a cylinder head and glow plug caution for 2001-2022 GM 6.6L Duramax diesel engines. This caution is expressed for anytime cylinder head work is being done.


Through the multiple years of improvements to this engine several cylinder head and glow plug designs have been used for the many different engine models involved. It is important to note that there is not 100% interchangeability of cylinder heads and glow plugs.




Cylinder Head Installation for 2003-2015 Fiat/Iveco 4.5 and 6.7L NEF Diesel Engines


The AERA Technical Committee offers the following information regarding the cylinder head installation for 2003-2015 Fiat/Iveco 4.5 and 6.7L NEF diesel engines. This information should be referenced anytime the cylinder head is being installed.


The manufacturer of these engines indicates the cylinder head bolts may be reused if they’re qualified using the following detail. Before using the cylinder head bolts again, measure them twice as indicated in the illustration, checking the D1 and D2 diameters.




Polymer Coatings for Race Engine Bearings


By Dr. Dmitri Kopeliovich


Most race engines work at very high loads and at high rotation speeds. Combined with the use of low viscosity oils, these conditions cause substantial reduction of the minimum oil film thickness, which separates the bearing and journal surfaces. As a result, metal-to-metal contact occurs frequently. Such contact requires a bearing material with superior antifriction properties.


Lack of liquid lubricant (oil) during mixed lubrication [1] may be compensated by a bearing surface consisting of a polymer matrix. Containing solid lubricants distributed in the form of fine particles, this polymer matrix can be applied as a coating to existing bearings to serve as the top layer.




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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.




AERA Tech & Skills Conferences


Everyone in business owes it to themselves and their business to gain knowledge and network with other people within the same industry. AERA understands that traveling to national trade shows to gain knowledge and networking opportunities is very expensive. Therefore, AERA has decided to help by teaming up with a regional host and offer these opportunities to different regions of our country and hopefully closer to your shop. All shops welcome! Need not be an AERA member to attend.




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