You may be surprÂ­ised to discover that a carbon monoxide (CO) detector really isn't a complicated piece of equipment. Housed inside a plastic chamber approximately 3 inches (7.6 centimeters) in diameter are parts that work in unison to alert a househoÂ­ld when lethal gas is detected.
This type of noise is usually caused by malfunctioning valve lifters or an exhaust manifold leak. If the noise lasts for more than a minute and completely disappears or dimishes after the engine is warm, the most likely cause is an exhaust manifold leak.
In the case of hydraulic systems, there are three easily detectable symptoms that give early warning of root cause conditions. These symptoms are abnormal noise, high fluid temperature and slow operation. Abnormal Noise. Abnormal noise in hydraulic systems is often caused by aeration or cavitation.