74M35A2
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Unbeknown why, the military uses a widely spaced alternator bracket referred to as a J-180 "long", which traps us into using the somewhat unreliable and outdated $400 24V Prestolite 60 amp alternator.
Since the 8.3L engine is primarily a civilian use engine, I looked at the alternator mount on some civilian eBay engines listed which otherwise have the same belt configuration, and ordered such bracket from my local Cummins dealer based upon the serial number of one such engine.
It arrived, and I was able to confirm that it does in fact fit the much more conventional and readily available J-180 "short" type alternators, which have about 4" of space between the double feet. This bracket is a direct bolt on, and about $80 as new from Cummins. Should be even much less at your local truck salvage yard if available. Distance between ears of this bracket is 3-7/8" outside-to-outside. The alternator you have should have a "slide bushing" in the rear ear which will move and take up any slack as long as it is close. Both ears on this mount are threaded holes. Do not use a single bolt through the alternator to draw it all together, unless your bracket is solid all the way through the bracket ears (this one is not).
Your lower mount is simply a tie rod type bar which should work as is. Additional pic is a civil 8.3L engine with this mount and corresponding alternator in place.
Since the 8.3L engine is primarily a civilian use engine, I looked at the alternator mount on some civilian eBay engines listed which otherwise have the same belt configuration, and ordered such bracket from my local Cummins dealer based upon the serial number of one such engine.
It arrived, and I was able to confirm that it does in fact fit the much more conventional and readily available J-180 "short" type alternators, which have about 4" of space between the double feet. This bracket is a direct bolt on, and about $80 as new from Cummins. Should be even much less at your local truck salvage yard if available. Distance between ears of this bracket is 3-7/8" outside-to-outside. The alternator you have should have a "slide bushing" in the rear ear which will move and take up any slack as long as it is close. Both ears on this mount are threaded holes. Do not use a single bolt through the alternator to draw it all together, unless your bracket is solid all the way through the bracket ears (this one is not).
Your lower mount is simply a tie rod type bar which should work as is. Additional pic is a civil 8.3L engine with this mount and corresponding alternator in place.
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