Posted by RN on September 22, 2012 at 13:53:45 from (68.190.80.254):
In Reply to: 1930 Packard posted by El Toro on September 18, 2012 at 15:02:21:
Packard military boat and plane engines that were slightly modified from rolls-royce merlin designs used a packard developed bearing material in some critical wear points that were a known problem- the "Quill Shaft" cam drives were one, the 2 speed supercharger drives another. Packard engine had half the failure and/or need maintenance rate compared to the British made engines. Oil seals were another improvement, some closer manufacture clearances due to somewhat better tooling used in manfacturing helped also. Merlin was a large casting of crankcase and cylinders instead of seperate case and cylinders- the casting molds used by British were adequate but just barely able to cast the units and had a minor heat variation, cooling difference at casting that had some little cracks overlooked until oil leaks, etc. The larger casting units used by Packard maintained even heat during casting, less cracking. British Bristol engines as used on many of the light bombers were multipiece designs, builds about same as Wright Cyclones and P&W radials- put the pieces together and if one part isn"t quite right can do replacement of one cylinder, mix and match, just make sure crank bearing on main rod is good, tolerate some oil use- and the small individual parts won't need as large a foundry or mold capacity so the existing tooling worked better- or wasn't a limitation.. Car engine developement of bearing material worked for aircraft engine, having the manufacturing equipment for mass production of car engine meant capable of detail improvements in the Merlin design.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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