BEARING-TAPERED ROLLER 3658189 - Caterpillar

3508 (68Z),
3512 (65Z)Introduction
The 7C1649 Engine Mounting Group is used to adapt the existing engine mounting rails when installing a Caterpillar 3508 or 3512 Engine. A 7C1925 Flywheel Group and a 7C1927 Flywheel Adapter Group must also be used.Necessary Parts
Assembly Procedure
Front Engine Mounting Point1. With the engine removed and the generator still in place, measure the thickness of the 5L5702 Pad, located on inside of rail at front engine mounting point, as shown above. Remove the 5L5702 Pad and grind the inside of the rail smooth.
7C1929 Plate Mounting2. Grind a new 7C1929 Plate to the same thickness as measured in step 1.3. Weld the 7C1929 Plate to the existing rail. Be sure that the top edge of the 7C1929 Plate is flush with the top surface of the 5L5693 Pad.
Rear Engine Mounting4. Measure and record thickness of the existing 5L5703 Pad at the rear engine mounting point. Use the same method of measurement as used in step 1. Remove the existing 5L5703 Pad and grind the inside of the rail smooth.5. Grind a new 7C1929 Plate to the same thickness as measured in step 4.6. Weld the 7C1929 Plate to the inside of the existing rail. Be sure that the top edge of the 7C1929 Plate is flush with the top surface of the 5L5694 Pad. Be sure to maintain tolerance "A" when welding the 7C1929 Plates.The top of the 7C1929 Plate may be dressed slightly with a file, if necessary.7. Existing holes in side rails which are covered by the two new 7C1929 Plates may be filled in with weld.8. Using existing holes in the 7C1929 Plates as a guide, drill six- 20.5mm (.80 in.) diameter holes in front of rail and drill the front three holes in the rear of rail.9. Use steps 1 thru 8 above to modify the other mounting rail.
Flywheel Housing Mount10. Fasten two new 7C1930 Plates to new flywheel housing (part of 3508 or 3512 engine), using six 2H3743 Bolts and six 8G2077 Spacers.11. Install new 7C1926 Flywheel Adapter to existing generator using 16 new 0V0459 Bolts.12. Mount the new engine to rails using six new 0L1178 Bolts and six new 5P8248 Washers at front of engine on each side. Use three of the same bolts and washers at the rear of engine on each side.13. Weld four new 7C1928 Gussets in place as shown above.14. Connect the engine flywheel to the 7C1926 Adapter Group using 12 new 313185 Bolts. The bolts must be inserted through the front of the flywheel housing, through the 44mm (1.74 in.) diameter hole (at approximately eight o'clock as viewed from the rear of engine). The bolts go through the flywheel and into 7C1926 Adapter. The flywheel must be manually rotated to install each succeeding bolt.15. Shimming and final generator alignment instructions are given in the following topic.Engine Generator Alignment
GT-601 generator is used with the Caterpillar 3508 and 3512 diesel engines.Checking Generator Alignment
Typical Engine -Generator ArrangementGenerator alignment may be checked by measuring the web deflection of the crankshaft