Diesel Engine Failure Analysis

The diesel engine, the significant part in generators crankshaft malfunction by the crankshaft itself, quality and prepared management reasons arising. This paper analyzes the prepared unprofessional conduct caused due to the diesel engine crankshaft failure occurrence, but its repair methods briefly described. Keywords: Diesel conceptual: diesel engine crankshaft failure by the crankshaft itself, the quality and prepared management reasons arising. This article analyzes the process and management due to the wood caused by shocking

Oil crankshaft malfunction occurrence, but its repair methods are briefly described.

Keywords: diesel engine crankshaft; responsibility; investigation; repair

Beginning: The crankshaft is a vital engine part, which accounted for the entire cost of the diesel engine 1/4. If the crankshaft failure, ranging manipulate on the engine power, economy, heavy injuries will lead to crash to a major accident.

Crankshaft congregation of the piston reciprocating motion into rotary suggestion, the effect of gas heaviness on the piston into a moment of force and subjected to periodic change. Since touching parts inertia and centrifugal force, so that the crankshaft torsion, winding, shear and tensile, firmness, and other complex irregular stress, and by the waves, the wind, the impact of the load, so the crankshaft is tremendously harsh working environment the.

A diesel engine crankshaft malfunction and Analysis

Cause most of the crankshaft caused by inappropriate operation by the management.

If you plan to buy one diesel generator set, I think, the following is read necessary.

(1) long-term work overload the crankshaft diesel long period of weariness, or diesel engine after starting the engine discharge not without delay increase the strangle at high speed, easy to manufacture failure. Because the crankshaft is stationary original state due to the crank itself and the weight of the piston rod congregation, pressed against the crankshaft bearing, bearing oil contains mostly innermost from the gap between the crankshaft and the bearing squeezed out. When the crankshaft at high speed, because less oil, cannot form a film between the crankshaft and behavior friction cannot produce liquids, semi-dry or dry rub only in the state, resulting in bearing melts at high temperatures, namely, “Burnt”, the arrangement “Watts hold the crankshaft” occurrence.

(2) Abnormal crankshaft and bearing wear is primarily caused by the malfunction of the lubrication system. Low oil pressure or oil aqueous contraction, if the crankshaft bearing Burnt crash soon after, because of reciprocating piston within the cylinder still do work, collective with the inactivity of the flywheel, the crankshaft will continue to turn a corner. But this time hold together with the crankshaft bearing has, so bearing in the bearing seat are also turned a place. Operating personnel compulsorily turn the crankshaft or re-start, the bearing seat wear and tear. The new tile is not installed because “Burnt” when the bearing alloy melting temperature, tile back and seat hole surface involuntary strength decreases, when the molten alloy material is squeezed out, the bearing authorization abruptly lead bearing positioning convex Slide the shoulder positioning groove.

(3) mechanical impurities controlled in oil, or other foreign particles, so that the crankshaft taper and ovality produce, as the crankshaft journal is not round, uneven distribution of the lubricating oil, so that lubricating performance, bearing temperature rise , resulting in “Burnt.”

(4) Connecting rod bearing clearance is too large, difficult to store oil, the gap is too small, the oil shortage will bite journal bearing formation of “Burnt.”