Usage:
D348 (57K) and D349 (32R) Engines in Off-Highway Trucks
- SUPPLEMENT: 12/19/77
SERVICE MAGAZINE MAY 23, 1977, PAGE 8. In the article "Method Of Piloting Power Generator To Engine Improved" remove the information shown in the "CAUTION" and add "DO NOT DISASSEMBLE THE FLYWHEEL ASSEMBLY". If the flywheel assembly is disassembled and then reassembled again, there can be a change in alignment between the pilot bores that mate (go into) the crankshaft gear and the generator armature. Wrong alignment of the pilot bores will give wrong alignment of the generator armature. A wrong alignment of the generator armature will cause vibration.
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Description of Change: The method used to pilot (put into alignment) the armatures of single-bearing generators to the above engines is now different than formerly. The armature now pilots into a bore on the rear side of the flywheel assembly. Formerly, an adapter bolted to the armature and piloted into a bore in the gear on the rear of the crankshaft. This adapter is no longer used. The pilot diameter on the adapter can wear after a period of time and make alignment difficult, if separation of the engine and generator becomes necessary.
The coupling, which is part of the flywheel assembly, is not changed except the bores that pilot the armature and crankshaft are now machined after the flywheel assembly is completely assembled at the factory. This is done to give close alignment between these two bores. The individual (separate) parts of the flywheel assembly are not available for parts service.
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If the flywheel assembly must be disassembled for any reason, it must be assembled with the "X" reference marks on the three major components in a line. This procedure will keep the pilot bores for the crankshaft and the armature in correct alignment with each other. In addition, balance of the flywheel assembly will not be changed.
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Adaptable As: Shown in the parts chart.
