CONE-ROLLER BEARING 5P0891 - Caterpillar

Test the point gap type magneto by the spark at the spark plug. When testing, remember that the magneto output is effected by the condition of the instrument panel components - magnetic switch, stop switch, oil pressure gauge and water temperature gauge. If equipped with overspeed shutoff contactor, and/or gas line valve solenoid, they also are connected with the magneto, and could cause indication of magneto malfunction.Firing Order
MAGNETO OUTLET NUMBERING DIAGRAMS (SAE Standard Rotation)
MAGNETO OUTLET NUMBERING DIAGRAMS (SAE Opposite Rotation)Magnetos on SAE Opposite Rotation (clockwise) engines turn in the same direction as those on SAE Standard Rotation (counterclockwise) engines. Direction arrows in the illustrations indicate rotation of magneto distributor disc.Timing Magneto To Engine
1. Remove the timing pointer cover from right side of the flywheel housing.2. Rotate crankshaft in direction of engine rotation until No. 1 piston (right bank) is coming up on compression stroke. On compression stroke, both intake and exhaust valves for No. 1 cylinder are closed.3. Continue rotating crankshaft until desired timing mark appears directly under flywheel pointer. See Chart of Instructions for Timing Magneto to Engine for various conditions such as gas used and compression ratio.
FLYWHEEL TIMING MARKS (TOP CENTER) (View through timing pointer opening)
1-Flywheel pointer.4. Position the magneto drive slots in the proper position for timing. The drive coupling can be pulled to the rear, then positioned and pushed forward into engagement.
DRIVE SLOT POSITION (Viewed from the rear of the engine)
FLYWHEEL TIMING MARKS 30° BEFORE TOP CENTER (BTC)
2-SAE Standard [(CCW) counterclockwise] rotation G398 and G379 Engines right and left banks. 3-SAE Opposite [(CW) clockwise] rotation G379 Engine right bank. 4-SAE Opposite [(CW) clockwise] rotation G379 Engine left bank. 5-SAE Opposite [(CW) clockwise] rotation G398 Engine left bank.5. With magneto off the engine, remove timing plug and rotate magneto drive until yellow mark (6) on distributor disc appears in center of opening.6. Install the top magneto (right bank). The drive tang and slot should be vertical and engage with very little repositioning.
MAGNETO TIMING
6-Distributor disc yellow mark.7. Rotate crankshaft in direction of engine rotation until No. 12 piston (G398 Engine) or No. 8 piston (G379 Engine) is coming up on compression stroke. On compression stroke both intake and exhaust valve are closed.8. Repeat Steps 3, 4, and 5. Then install the lower magneto (left bank). The drive tang and slot should be vertical and engage with very little repositioning.9. Make final adjustment of timing by rotating the magneto at the drive housing mounting and with use of a timing light and jumper wire when the engine is running at any speed. SAE Standard Rotation - Connect timing light to No. 1 spark plug to time the right bank and to No. 12 (12 cylinder) or No. 8 (8 cylinder) spark plug to time the left bank. SAE Opposite Rotation (clockwise) - Connect timing light to No. 1 spark plug to time the right bank and to No. 4 spark plug (both 12 cylinder and 8 cylinder engines) to time the left bank.Wiring
The magneto supplies a