If engine loses the power, making more smoke than usual or even feel exhausted on a push of throttle, this is the time to check your cylinder head for cracks
The gasket failure is a common problem in the engines and sometimes it is misdiagnosed as some other issues. There is also a chance of a broken gasket and it can damage the engine as a whole. Gaskets on the cylinder heads and engine blocks usually create a barrier between engine oil and coolants passing through the waterways in the cylinder heads and engine blocks. When it cracks or burnt or even fails to perform better under higher working states, it leads to more major problems by mixing water in the engine oil. Due to sudden temperature changes, the chances of thermal damages arise and sometimes lead to cracks in the engine components. Cylinder heads are the most vulnerable parts to these sudden damages. There are different ways to test cylinder heads against the cracks that engine reconditioning experts use. Let’s see how the cylinder head cracks can be found and tested through pressure testing.
Cylinder Heads Pressure Testing
Pressure testing of the cylinder heads is one of the hot immersion technology to identify coolant passage leaks. This method of testing can be used along with four other methods of testing the cylinder heads. But is the most reliable method of testing and usually, comes at the end of all testing processes as a final step to make sure that your cylinder head is now in good health or it still has issues.
How to pressure test cylinder heads?
This process is frequently used as an ultimate investigative technique that all of the cracks or pinholes had been identified and repaired. Definitely, it might not be thoroughly simple; there are two approaches to perform pressure testing out – moist or dry. Tactics are almost the same regardless of which procedure you select.
Dry air pressure testing
To begin with the testing process, the head being tested wishes to be utterly smooth. a precise block-off plate will be connected to the top to seal off the water passages, then pump pressurized air into the top by means of an air pipe inserted into a water port. Some sources will inform you to make use of about 60 psi, but the experience and experiments show that 20 to 25 psi is enough. Some heads have core plugs pressed into them and there is a big chance that these will blow out at 60 psi. It’s no longer best an inconvenience, it’s also a massive safety hazard.
Wet testing process
With the wet process, you’ll lean back the cylinder head into a water tank unless it’s completely water-logged. In case you have cracks, the fugitive air bubbles will reveal you where the cracks are. The dry process is alike but a bit hard identify cracks. Instead of taking the head to the water, you’re bringing the water to the cylinder head. As soon as the head is pressurized, you’ll spray it with a soapy resolution to create bubbles and it will make your testing even easier. If there are cracks or holes, the answer will bubble up and also you’ll recognize where you need to restoration and repairing.