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AERA Technical Bulletins – October 28, 2022



Cylinder Head Oiling Caution on 2007-2010 Mini Cooper 1.6L N14 Engines


The AERA Technical Committee offers the following information regarding a cylinder head oiling caution on 2007-2010 Mini Cooper 1.6L N14 engines. This caution should be considered anytime a DTC has been set or the cylinder head has been disassembled.


The proper oiling of the front of the cylinder head relies on a complete seal between all reported components. It’s been reported the oil gallery on both front cam caps may leak after time of numerous engine cycles or overheating. The sealing area of the head and the top assembly has minimal clamping load (7.4 FT/LBS 10 Nm) and may not seal 100% the pressurized oil. 



Valve Identification on 2006-2020 John Deere 6090, 9.0L Diesel Engines


The AERA Technical Committee offers the following information on valve identification for 2006-2020 John Deere 6090, 9.0L diesel engines. This information should be referenced anytime the cylinder head is being assembled or valve lash is being adjusted. 


The engine valves for these engines both carry the same dimensions with a head diameter of 1.570-1.580″ (39.870-40.130 MM). On the valve head, new exhaust valves are identified with a white mark in a small cast depression. Intake valves are identified with a blue mark in a larger cast depression as shown below. The intake valves are also magnetic while the exhaust valves are not. The intake valves should also be numbered R520223, and the exhaust valves should be numbered R520224.



FA20 Engine


Naturally aspirated, flat four engine for Subaru and Toyota sports cars

By Dave Hagen


At the beginning of 2012, the joint Subaru and Toyota model was put into production. You know it as Subaru BRZ, Toyota 86 or Scion FR-S. This new, naturally aspirated, flat four FA20 engine was developed specially for these sports cars. It was built based on a FB20 cylinder block, modified into square bore/stroke ratio. The diameter of its cylinders and piston stroke is 86mm. Unlike the usual FB20, this motor uses new pistons, a new crankshaft, and the compression ratio was increased to 12.5:1.


FA20 engines use new heads with a direct injection system of the Toyota D4S, a variable valve timing system AVCS that is used on both intake and exhaust camshafts. Also, 4-2-1 headers are installed on this motor.




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Podcast Episode 20

Engine Analysis


Steve and Chuck, along with special guest Dan Begle from MAHLE, discuss engine analysis. Dan tells us about when he worked in the NASCAR world doing engine analysis, documenting his findings, and why this is important. They also answer tech questions received on the AERA techline that deal with surface finish for head gaskets and gasket thickness. For the history segment this month, they take a look at when the Small Block Chevy came to life and how big was it!



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