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AERA Technical Bulletins – October 7, 2021

Cylinder Head Cracks on 2003-2005 Dodge 2.4L SRT4 Engines

The AERA Technical Committee offers the following information for cracks in the cylinder head for 2003-2005 Dodge 2.4L SRT4 engines. This vehicle uses a higher performance A853 version of the standard 2.4L engine.
The cylinder heads that have been affected with cracks have carried the casting numbers 4667086-B and 4667086-D. It’s been reported the cracks have been located in the number one cylinder extending away from an exhaust seat. Most often they are visible with a naked eye.

Cam to Crankshaft Timing on John Deere 6105 and 6125 Diesel Engines  

The AERA Technical Committee offers the following information on cam to crankshaft timing for John Deere 6105 and 6125 diesel engines. This information should be referenced anytime the engine is being assembled.
Obtaining the following special tools required to perform this task will be necessary before attempting this procedure: JDG971 Timing Pin – 2 and JDG820 Flywheel Turning Tool.

GM Active Fuel Management (AFM) System


The GM displacement on demand system known as AFM (Active Fuel Management) was implemented in the GM LS engine family to improve fuel economy. This cylinder deactivation
system shuts down four of the eight cylinders on an LS to reduce fuel consumption and emissions. The system is controlled by a combination of electrical signals, solenoids and oil pressure.
To properly diagnosis problems with this system you must first understand how it functions.
Major components of the AFM system include: Oil Pump, VLOM (Oil Manifold), AFM Lifters, ECM (Engine Control Module), Primary & Secondary Oil Filter, and Oil Pressure Sensor.

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Podcast Episode 12 – Torque Plates

Steve and Chuck take a deep dive into the why you should use a torque plate when honing the cylinder block and its importance. Also, do you know which car manufacture and model just hit the 50 million mark in sales? They will inform you as well as which engine hit the 2 million production mark in 1955. Take a listen and subscribe to the Engine Professional podcast!

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