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AERA Technical Bulletins – October 14, 2021

Cam Cap Installation on 2012-2017 GM 2.4L LEA Engines 

The AERA Technical Committee offers the following information on cam cap installation for 2012-2017 GM 2.4L LEA engines. In the event you receive a cylinder head and none of the cap locations were documented before disassembly, refer to this bulletin. It is important that any cap that is removed be reinstalled in its original location. 
The cam caps are numbered from the factory, but those numbers may be hard to see before cleaning has occurred. See the images below to assist in locating the caps correctly. The exhaust cam caps are numbered 1 through 5 and the intake cam caps are numbered 6-10. Other than there numbering, the caps all appear identical.

Front Cam Bearing Installation for 1996-2010 Landrover 4.6L Engines  

The AERA Technical Committee offers the following information on the front cam bearing installation for 1996-2010 Landrover engines. This information should be referenced anytime the cam bearings are being replaced.
The front cam bearing for this engine is unique in design and must be orientated properly during installation. The design incorporates four angular grooves that should be positioned toward the timing gear when properly installed. The photo below shows those grooves marked with a black highlighter for reference. Observing and photographing cam bearing positioning before removal can save time during re-assembly.

Rocker Arm Tech:
Leveraging force between the pushrod to the valve


Rocker arms (featured in all OHV (overhead valve) engines transmit lifter movement (via pushrods) to the valves. Because the rocker arm is essentially a lever, the length of the rocker (pushrod contact point to pivot) increases valve lift relative to cam lobe lift. In other words, the rocker’s length provides a ratio-multiplier that “magnifies” the lift of the cam lobe to create effective valve lift.
ROCKER ARM RATIO: Ratio is increased by shortening the distance between the rocker’s fulcrum point to the pushrod cup, increasing the leverage effect of the rocker arm fulcrum point to the valve.
Determining gross lift (valve lift) involves considering both the camshaft lobe lift and the rocker arm ratio. The ratio of the rocker arm (length of fulcrum) increases the effective valve lift beyond just the camshaft’s lobe lift.

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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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