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Other Slow Speed Diesels / Acceptable Slop in Crank to Balance Shaft Gearing of Chanfga-style 1115
« on: March 31, 2007, 05:20:52 PM »
Based on comments from posts in another thread, I came to the conclusion that my Changfa-style 1115 might have a significantly higher level of vibration than what other owners were seeing with equivalent or larger engines. Shortly after that, I noticed that when the flywheel was rocked back and forth through a 15 - 20 degree arc, there was a noticeable "clunk" from inside the crankcase. Initially, I though I had a bad rod bearing, but after removing the piston and connecting rod, the noise was finally localized to the gears that connect the crank to the balance shafts.
When the engine is running, I don't hear anything that would suggest that the engine is coming apart, although with a stethoscope, I think I can hear a light "clunk" occurring at the same speed or a sub-multiple of the crank speed.
I'd like to ask other owners of 1115's or 1125's to run a 30 second test on their non-running engines. Could you please roll the flywheel to a point away from the compression stroke, rock it back and forth through a 20 degree arc, and let me know what you hear in terms of mechanical noises from the crankcase?
Thanks guys,
Terry
When the engine is running, I don't hear anything that would suggest that the engine is coming apart, although with a stethoscope, I think I can hear a light "clunk" occurring at the same speed or a sub-multiple of the crank speed.
I'd like to ask other owners of 1115's or 1125's to run a 30 second test on their non-running engines. Could you please roll the flywheel to a point away from the compression stroke, rock it back and forth through a 20 degree arc, and let me know what you hear in terms of mechanical noises from the crankcase?
Thanks guys,
Terry