-Air escaping into the radiator indicates a compression leak into the cooling system through a bad head gasket or a crack in the head or cylinder.
-Air escaping into the crankcase indicates blowby due to worn rings, a worn or damaged cylinder, or a cracked or burned piston.
Once you’ve honed in on the area of the suspected compression leak, you can then use a borescope to examine inside a problem cylinder to look for some of the conditions mentioned previously. You may also be able to use a smoke machine to further confirm leak sources, such as leaky valves. Please note that when examining the internals of a cylinder with a borescope, it may be difficult to confirm worn rings or other problems that may require engine disassembly.
As technology marches on, and the service industry continues to evolve with it, new tools and techniques are sure to keep pace. Please send along your tool and equipment questions so that we may address them in a future issue. Stick with PTEN and we’ll keep you in step right along the way.