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Natural Gas Engine Driven Chiller Problems
We have a TECOCHILL 150 ton Natural Gas V8 Truck engine driven screw chiller that has been giving us problems with push rods being damaged. We've had to replace a set of 4 pushrods for one bank twice.
The cylinder block is made of cast iron and has 8 cylinders arranged in a "V" shape with 4 cylinders in each bank. Five main bearings support the crankshaft, which is retained by bearing caps that are machined with the block for proper alignment and clearences. The cylinders are completely encircled by coolant jackets. The engine rating is 159 bhp at 3300rpm with a 10 degree delta T of 44*F - 54*F chilled water.
This engine was replaced 3 years ago and we recently replaced the engine oil as well. The Chiller mainly operates during swing season bet. March - May & September - November. The first time we had the push rods damaged we thought we were not giving the chiller enough of a load. Which was not the case. Once the push rods were replaced we started up the chiller at a lower rpm about 1300 rpm and gradually raised the speed. When we approached 2600 rpm the engine started to make a loud clapping sound. The end result was we damaged the second set of push rods in the same bank. The other bank of the engine received no damage to any of its rocker arm assembly. We are puzzeld as to what the problem might be. So far we know the screw compressor alignment with to the engine is not a factor. If possible we would appreciate some feedback.