D399, G399, D398, G398, D379, G379 ENGINES Caterpillar


Balancer - (D379 Only)

Usage:

A gear-type balancer is provided on this engine to counteract vertical inertia forces of the connecting rods and pistons. The balancer counteracts these forces by means of weights (balance gears) rotating at twice engine speed. If these rotating weights are properly installed, they cancel the unbalanced forces; but if not properly installed, they may actually add to the connecting rod and piston intertia forces, thus increasing engine vibration.

One rotating balancer is located at the right front of the engine and the other is located at the left rear. The front balancer is driven by an idler gear which in turn is driven by the crankshaft gear. The rear balancer gear is driven by the camshaft gear cluster which is driven by the crankshaft gear.

Removal And Installation

1. Remove the front accessory drive housing as described in the topic, FRONT ACCESSORY DRIVE.

2. Remove the oil pan and flywheel housing as described in the covering topics.

3. Support the engine on its left side.


1-Balancer gear. 2-Thrower. 3-Retainer.

4. Position the balancer as illustrated.

5. Remove the throwers (2) and (5) as described in the topic, CRANKSHAFT.


4-Balancer gear. 5-Thrower.

6. The balancer gear shafts are pressed into the block and can be removed and replaced if necessary.

7. Before installing a new balancer gear shaft, chill the shaft cool enough to allow .002" to .003" shrinkage.

8. Using a soft hammer, drive the shaft into the block. The distance between the face of the block and the end of the balancer shaft is 2.684"-2.688".

9. Install earlier type replacement bearings so that the seam is aligned with center of the weighted side of gear. Later replacement bearings need no alignment.

10. Install the front balancer gear referring to the topic, FRONT ACCESSORY DRIVE for the correct timing procedure.

NOTE: See the topic, SPECIFICATIONS, for the correct bearing clearance and retainer bolt torque.

11. Install the rear balancer gear referring to the topic, TIMING GEARS, for the correct timing procedure.

Caterpillar Information System:

D399, G399, D398, G398, D379, G379 ENGINES Basic Block Components
D399, G399, D398, G398, D379, G379 ENGINES Front Accessory Drive
D399, G399, D398, G398, D379, G379 ENGINES Timing Gears
D399, G399, D398, G398, D379, G379 ENGINES Vibration Damper
D399, G399, D398, G398, D379, G379 ENGINES Valves And Valve Mechanism
D399, G399, D398, G398, D379, G379 ENGINES Cylinder Heads (Diesel Engines)
D399, G399, D398, G398, D379, G379 ENGINES Cylinder Heads - (Natural Gas Engines)
D399, G399, D398, G398, D379, G379 ENGINES Turbocharger
D399, G399, D398, G398, D379, G379 ENGINES Turbocharger
D399, G399, D398, G398, D379, G379 ENGINES Turbocharger
D399, G399, D398, G398, D379, G379 ENGINES Turbocharger
D399, G399, D398, G398, D379, G379 ENGINES Air Induction And Exhaust System
D399, G399, D398, G398, D379, G379 ENGINES Flywheel And Flywheel Housing
D399, G399, D398, G398, D379, G379 ENGINES Engine Attachments Systems Operation
D399, G399, D398, G398, D379, G379 ENGINES Engine Attachments Testing And Adjusting
D399, G399, D398, G398, D379, G379 ENGINES 2N6006 Governor Air Actuator
D399, G399, D398, G398, D379, G379 ENGINES 1N9318 & 7L135 Governor Air Actuators
D399, G399, D398, G398, D379, G379 ENGINES 2N6961 Clutch Assembly
D399, G399, D398, G398, D379, G379 ENGINES Flexible Coupling
D399, G399, D398, G398, D379, G379 ENGINES Air Starting Motor
D399, G399, D398, G398, D379, G379 ENGINES Governor (Woodward EG-3P) D379 68B1616-Up, D398 66B2049-Up, D399 35B1-Up
D399, G399, D398, G398, D379, G379 ENGINES Governor (Woodward UG-8) D379 68B1616-Up, D398 66B2049-Up, D399 35B1-Up
D399, G399, D398, G398, D379, G379 ENGINES Governor (Woodward UG-8) G379 72B264-403, G398 73B511-795, G399 49C1-172
D399, G399, D398, G398, D379, G379 ENGINES Governor (Woodward EG-3P) G379 72B264-403, G398 73B511-795
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