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AERA Technical Bulletins – January 7, 2022

Cylinder Head Assembly Caution on 2012-2020 Fiat 1.4L Engines

The AERA Technical Committee offers the following information on assembling the cylinder head on 2012-2020 Fiat 1.4L engines. This information applies to engines that have 16 valves that are operated by a single overhead cam (SOHC). 
These engines use unique valve spring shims for each intake and exhaust locations. The intake shims are thicker than the exhaust shims, which may not always be noted during disassembly. The intake shim is approximately .100” (2.540 mm) thicker and is available with Part #4892681AB and the exhaust is Part #4892679AB.

Cylinder Block Caution on 2011-2020 Caterpillar C4.4 Diesel Engines

The AERA Technical Committee offers the following information on a cylinder block caution for2011-2020 Caterpillar C4.4 diesel engines. This engine is a 4-cylinder version of the previously designed C7.1 engine. It also shares the cylinder block material of CGI (Compacted graphite iron).  
The newer CGI blocks offer different structural integrity and do not require a torque plate to bore and hone. Caterpillar now offers pistons and rings in .020” (.050 mm) & .040″ (1.000 mm) oversizes to repair worn cylinder bores in these engines. AERA is currently aware of one aftermarket supplier of pistons and rings for these engines, Maxiforce.

Head Gasket Sealing


Today’s head gaskets have come a long way in design and function over the last five or six decades. The requirements for them have driven these changes and we will look at this
evolution to help explain for those who are new to this industry or brush up for those who have been around a long time.
The early head gasket was often referred to as a sandwich style gasket. They were a fiber-based material that had excellent thermal properties that was sandwiched between to layers of copper or steel and then eyelets were closed around all the coolant and oil openings to keep the fluid
from getting to the fiber material within. The combustion openings had metal armors that formed around the top and bottom like an eyelet to contain the combustion process. This gasket style was very soft and conformable to accommodate very loose manufacturing tolerances of the day.

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Podcast Episode 14 – Incoming Part Inspection

Steve and Chuck discuss the importance of inspecting and checking your incoming parts before you start to assemble that engine. Making sure that that the parts you ordered are correct by taking measurements and comparing is a vital step in making sure that engine runs and last. Also discussed is the finishing of the Indianapolis Motor Speedway which was completed in December of 1909. Take a listen and learn a little history as well as checking and inspecting parts coming into the machine shop!

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