Valve fracture may be due to:

1. In its own processing and heat treatment process crack;

2. Distort the valve seat, so that the valve under bending stress;

3. As the touch-valve piston, valve train drive pieces of campaign misconduct or inappropriate space and impact;

4. Valve head temperature resulting from uneven distribution of heat stress.

In order to prevent wear and tear of early-valve, and burning broken and should pay attention to the following:

1. Strict control of the valve train lubricants, easy to generate excessive carbon deposition, will have at least speed up the wear and tear.

2. Block valve, valve and catheter valve should be strict to ensure that together.

3. The right to adjust valve clearance to prevent the valve piston collision.

4. Strictly control the cooling water temperature to improve the diesel engine's cooling effect.