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AERA Weekly Technical Bulletins – October 26, 2020



Cylinder Arrangement on Multi-Cylinder Yanmar Engines


The AERA Technical Committee offers the following information on the cylinder arrangement on multi-cylinder Yanmar engines. This information applies both to diesel and gas engines manufactured by Yanmar, and for other manufacturers such as Komatsu. 


This information should be considered anytime engine work is being done including timing and engine assembly. Most commonly, the number one cylinder is located at the front of the engine toward the engine’s radiator, Yanmar and a few other engines are not that way.




Revised Crankshaft, Connecting Rod and Bearings for 2012-2020 Cummins ISF 2.8L Diesel Engines


The AERA Technical Committee offers the following information regarding a revised crankshaft, connecting rod and bearings for 2012-2020 Cummins ISF 2.8L diesel engines. These new components are the result of product improvements that were implemented in the beginning of the year 2014.


Differences of the new components:

·     Connecting rod is a more robust design.

·     Connecting rod bearings are now 22 mm in width and use a red polymer overlay coating with increased debris tolerance.

·     Crankshaft incorporates wider 22 mm connecting rod journal with a reduced lubricating oil hole diameter and chamfer.




Cool enough to be forgotten? Don’t do it!




When the coolant level is okay, and the color of the coolant looks good, that’s the extent of the maintenance programs too many engines are subject to. Most modern engines are equipped with technology that gives instant feedback on various electrical and mechanical systems, where-as previous/older engines just had a gauge or indicator light to indicate something might need to be checked. Regardless of engine age, human interaction is still required when performing maintenance or visual inspections to maintain these systems properly.


In fact, the cooling system is no less important than the maintenance required of lubrication or fuel systems.




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