GEAR-PLANETARY 8P1918 - Caterpillar

ENGINES
G3516 (3RC, 4EK) INDUSTRIAL ENGINES DRIVING ARIEL JGK FOUR-STAGE COMPRESSORSProblem:
We have recently had two crankshaft failures in G3516 engines driving Ariel JGK Four-Stage Compressors. These units were equipped with double damper arrangement as currently recommended for this type package. There is currently analysis work being done to determine the root cause of these failures. In the mean time, any customer using the above K-frame compressor with a 22 inch diameter (or larger) primary compression cylinder and a three or four-stage system should inspect the viscous dampers carefully.Solution:
Check the dampers for any sign of viscous fluid loss. Measure and record the operating temperatures of the viscous dampers. The most accurate method of monitoring damper temperatures is to install a 8T-2821 Temperature Recorder Patch. This device has a range of 82°C to 110°C. If the window at 99°C or higher has turned black, consider the damper on the way to failure. If you are going to use a "Temp gun" to measure the damper temperature, be aware that a round surface that is painted with a gloss paint is very difficult to read accurately. You must take careful aim and be perpendicular to the surface being measured. It is better to check the damper temperature at the front face or on a flat surface if using a "Temp gun". The normal viscous damper will reach a stable temperature within the first four hours of operation and the damper temperature should remain fairly constant after that. If either damper:* Is showing an unstable operating temperature. * Has considerably higher or lower temperature than its companion damper. * Has a surface temperature that has risen above 100°C (212°F).* Shows signs of loss of viscous fluid. Please contact Gary Keffler at Phone Number (765) 448-5968 to determine the best course of action to prevent additional crankshaft failures.COPYRIGHT 1998 CATERPILLAR ALL RIGHTS RESERVED