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AERA Weekly Technical Bulletins – November 12, 2020



Valve Stem Measurement Tool for 2003-2012 Volvo 2.5, 2.8 & 2.9L Engines


The AERA Technical Committee offers the following information regarding a valve stem measurement tool for 2003-2012 Volvo 2.5, 2.8 & 2.9L engines. This information should be considered anytime the cylinder head is removed for valve service.


Service information supplied for these engines includes a measurement for the installed valve stem height of 1.8858-1.9252″ (47.900-48.900 MM) for both intake and exhaust valves. That measurement, however, requires the use of tool #9995222.




Main Bearing Cap Bolt Usage on 2015 GM 5.3, 6.0 & 6.2L LS Engines


The AERA Technical Committee offers the following information on main bearing cap bolt usage for 2015 GM 5.3, 6.0 & 6.2L LS engines. This information should be considered anytime the main bearing bolts are removed during service.


Beginning with the 2015 model year two design versions of the inner and outer crankshaft bearing cap bolts were used. Ensure that the new fasteners being installed are the same as the fasteners that were removed. If the correct bolts are not used during installation it will result in incorrect clamp load on the crankshaft bearing caps and could result in lower engine noise and/or damage to the engine. 




Top 10 Cam Failure Culprits




Cams, cams, cams. While camshafts can, and do “go out,” something other than a bad core more often than not is to blame. The use of flat tappet cams is still prevalent in the performance and restoration worlds and understanding their designed operation is important to build a durable engine. Below are 10 things to think about before calling foul on your cam or lifters.



Coil bind is when a spring compresses solid before or during full camshaft lift. This stack of metal stops the valve train motion, usually breaking the weakest link. This can result in bent pushrods, dropped valves and flattened cam lobes. There is a formula to make sure they won’t bind, if you are technically minded:


Valve spring installed height on seat

– minus – (cam lobe lift x times x rocker arm ratio)

+ plus + valve lash

– minus – safety margin

= equals = remaining open spring length.




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